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习题练习:Physics Unit2: Kinematics One Dimensional Motion

 作者: physics   总分: 98分  得分: _____________

答题人: 游客未登录  开始时间: 22年07月19日 23:10  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that an object travels from one point in space to another. Make a c0w-d -lha(f coompa h-da-c0o( wlfrison between the displacement and the distance traveled.

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When is the average velocity of an object equal to the paxu5m6 h*3qvggp07 sinstantaneous velocity?

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A new car manufacturer advertises that their car cansm s(o0kzbqz4 ) rib94 go "from zero to sixty in 8 s". This iomqr)k4s( 09 zib4 bszs a description of

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object moving in the +x axis experiences n xv ddg- o*hh75t0hkbw2r*gancn-a,4nus 35an acceleration of $2.0 \; m/s^2$. This means the object is

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that a car traveling to the East (+x direction) begins to slow down al93;u0 wl)sc lts( ikcs it approaches a traffic light. Make a statement concerning it(sclllkciw ;t u90s3)s acceleration.

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that a car traveling to the West (-x 9ybto4d sj3s(direction) begins to slow down as it approaches a traffic light. Make a statement concerning its sby4s(dj9 3ot acceleration.

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that an object is moving w4t6izy0v4s8mzx*yjo ith a constant velocity. Make a statement concerning i4s6moi4y8vyj0t *zx zts acceleration.

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity of an object is zero, does it mean thaw dvb+g7bs,v2tqyw- guxclv f -)4:mrhi y2;(t the acceleration is zero? Support your answer with aq,gwbiy2 (tb: x)mvhvwf-vrdl2-ysc7 ;4 + gun example.

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can an object's velochnp55za(:i 5.5 iz vqhhza9 0grjzwp7 ity change direction when its acceleration is constant? Suppori(zw9pg rq hij: a5z5v 7zh5p.hzn0a 5t your answer with an example.

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that an object is moving s;,yq/a oxfith 2,4 hd1 )lhhfwith constant acceleration. Make a statement concerning its motion with respect to t/2h ,hhlo)1t4xf ,hy;ifqda sime.

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can an object have increasing speed while its accelerz9o5(ubrd0iu5 2pc hyation is decreasing? Support your answer with an examp5ri0oudph5(b c 2u y9zle.

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a can, after an initial kick, moves up along a smi- 3 5x)amxgax(bwj b+ooth hill of ice. Make a statewjb3xx+- gi 5ab(xm) ament concerning its acceleration.

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Under what condition is average velocity equal to the average of the object's p19nj)54szsly kf)f.mi9s tc initial and 9szjfp1m 9y.)4nstkif5lc s) final velocity?

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Objects A and B both start at rest. They both accelerate atn bl:u5m /hr0bvtm;x2 the same rate. However, object A accelerates for twice the tb: ln;b mx5tmur/ 2vh0ime as object B. What is the final speed of object A compared to that of object B?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Objects A and B both start from rest. Thep3 o/ihwmoi5; y both accelerate at the same rate. However, object A acceleratep ioh/w;i m3o5s for twice the time as object B. What is the distance traveled by object A compared to that of object B?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When an object is released from rest an c2squl +xju55+ u2wum3odw/l d falls in the absence of friction, which of the followingcwum25 3+ l5jq+uuws/xdlu2o is true concerning its motion?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When an object is released from riksr.z2d5q - gest and falls in the absence of friction, which of the following is true conc rki2.sz g5q-derning its motion?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straight up. Make a statemex.,g/3cmwf1gxq+ ai r nt about the velocity and the acceleration whw1fq3 m. +xargxi /,gcen the ball reaches the highest point.

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straight up. What is its accec oj ksw wolva::40b1:leration just before it reaches itsalwkv:co:04 : 1 jbwos highest point?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown y g-k l9)1 l,lexh;yqym7epn5straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is g7xgp1y5l, 9h;me yk-llynqe)oing up.

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown straight up, reaches a maximum zp0j e5ifv65vb6 w6jnheight, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is c ijf6j5wnve6z5 b06 pvoming down.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown downward in the absence of air resistance. Make a s2nr toa*-/ .z 2kyobhotatement concerning its accelano b o2k./2y-rh* tozeration.

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a skydiver jumps from a high-flying plane. What is her acceleratio * eehvwob:fmi: d)ta( o2,xwa2n*af6n when she she reaches terminal velocityow)* af: 6iot,2 (:dnhaewmxa*v feb2 ?

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown vertically upward with a speed v. An identical secovs b 28q+uzrq7nd ball is thrown upward with a speed 2v (twice as fast). What is the zq28 rqu+vbs7 ratio of the maximum height of the second ball to that of the first ball? (How many times higher does the second ball go than the first ball?)

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Ball A is dropped from the top of a building. One seconw wtqt7+tat5,jtjdg+,o4 (de)g quvmd2c/4 o d later, ball B is dropped from the same building. jgt jd,d7eq o 4t,)cmt waguw5 /d+qv+(4ot2t As time progresses, the distance between them

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Ball A is dropped from the top of a building. One second later, ball B is drokfqv/*;k h.chmz2zks1* n /c ag :toa3pped from the same building. As time progresses, 3 k;o1n.skzvhmat2k:*g zah*/fc cq/the difference in their speeds

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two objects are thrown from the top of a tall building3 dt+*r9)at.jll) cpyci ms0hsv e.k1. One is thrown up, and the other is thrown down, cctikv l ly.) ts0a3p s9 md+h).*rje1both with the same initial speed. What are their speeds when they hit the street?

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A brick is dropped from t 4(np3bzai 4ffhe top of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare t3ip b4z anff(4he accelerations of the two bricks.

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with constant l8kfz2xyb3p l+qwqhm l,9e1dn 5x+m6 non-zero velocity in the +x axis. The position vers3 lx+q ,dl9 8kfyhn1 bzm2xl+pwm5 qe6us time graph of this object is

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with cojyy3 h7vnzh*k u5qf41nstant non-zero acceleration in the +x axis. The posinyvz 57kfq4h*ujh1y3tion versus time graph of this object is

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zero vel7vlae8y5dig5 (, mdfl ocity in the +x axis. The velocity versus time grapheif5myavl(g,7d5l d8 of this object is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with c0m(3v8 7azet2bzge4jyftj 2 pkng ::g onstant non-zero acceleration in the +x axis. The velocity versus time graph of thz 22vg gk a3e(g tzpt8eyb:0jmfn7j4: is object is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The slope of a position versus time graph )2.qlthse jr)4zcm3- yit p0ugives

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The slope of a velocity versus time gra s*bbtpg04, 4mt vj 7sj/vuhv,ph gives

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under a curve in an accelerv ik5 i7h8k+7mz7s: jf 9xx05ldxb hcbation versus time graph gives

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under a curve in kon ,4cfddoy:w;n3;a8ilgm5 j3 jh9v a velocity versus time graph gives

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the position versus time graph of an object is a h-ln+s,w68tik )3py- i jfjdczorizontal line, the object j y n-c3,liw 6kzf8dpj)st+-iis

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the position versus time graphaay0 kae:*r3m zq3cd , of an object is a vertical line, the object is dma3q3ay:c,0*erk az

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity versus time graph of an object is a horizontal line,ilor g( q+o-p-6jk2tz the object iskp+2jto(qliroz 6--g

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity versus time graph of an object is as oc;lyetqj7 ssf 92:)dmj06 4 vek.wu straight line making an angle of 30 degrees with the time axis, thes2to :jf ;c we um6ej94vsq.7dk0 ys)l object is

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object moves 15.0 m north and then 11.0 m south. Find both tp3o: ; r2)1nnrscxyzwv6jw, n he distance traveled and the magnzy;nn: 3swv)r o,nwrpjc x 126itude of the displacement vector.

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A boat can move at 30 km/h in still water. How long will it take to move 12 zpj6aj;e v1 p :yx/pdfgie:i7dry 2 9*km upstream in a rive:ix2 7*adfjy gry 91vj6d p:e ipzpe/;r flowing 6.0 km/h?

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  55 mi/h is how many m/s? (1 *, (sl o)x0;fuhzuzzdm9;ihg mi = 1609 m)

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What must be your average speed in order to travel 350 km in 5.15ijcwj/cav du4d(e1-u;cgr,nib v 5:/ h?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A runner ran the marathon (approximately 42.0 km;mt fr:pt c70r) in 2 hours and 57 min. What is the average stcfrtr 07m; :ppeed of the runner in m/s?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car travels 90 km/h. How long does it take for it to travel 400 kg6wp o q3upuwa9tt3.0pr l:6 vu+ y4uum?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ly (light year) is the d;1 esazz:+ i;7xpismwistance that light travels in one year. The speed of light is 3.00 x 108 m/s. z izx a:pws;ms e;+i71How many miles are there in a ly? (1 mi = 1609 m, 1 yr = 365 d.)

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you are driving 72 km/h along a straight road and you look to thes;,qhuq (5v7zx s z6iq side for 4.0 s, how far do you travel during thizuz iq;7qs6 q s(,xvh5s inattentive period?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you run a completekgkb*3)uj 2nu qczd4-d81 d wj loop around an outdoor track (400 m), in 100 s, your average velocity isd*k-bk cudz2d1n)8gwj3qu 4 j

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A polar bear starts at the No8lgvrc.t 4k5 nrth Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average s5rk gvlt.nc8 4peed?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A polar bear starts atrf2 5qlr.z5.gsjq/i: e z lb(b the North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's averabr l/z2q .5r.bjsg(ez:f il q5ge velocity?

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are driving home on a weekend from school at 55 mi/h for 110 mil7 14wy5x9c v,m8 zbel/nystfjes. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 h ewjscyn5 4mt7/9 ,fy1xbv 8zlours and 15 minutes. How far is your hometown from school?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is the a2tt7qq4 5xyfsverage speed of the motoristt45 qf72ysq xt for this trip?

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. Whakx+tr; 333o voflgg )stl0 t(ea)lm7s t is her avergtag mk let)0)r to3( 3xv 7l+3lofs;sage speed for the trip?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane travels at 300 mi/h south for 2 zsil9 ,u, :zj/3vqgfu.00 h and then at 250 mi/h north for 750 miu3j,s /luqzvg 9z:f,iles. What is the average speed for the trip?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a 400-m relay race the pa52v2tu 4kgf anchorman (the person who runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for team B, can cover 100 m in 10.1 s. What is the largest lead the team B runner can have when the team A runner 5tapfvuk2 4g2starts the final leg of the race, in order that the team A runner not lose the race?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car decelerates unifor(,.dmr*g wxus-uray f2yr- i-mly and comes to a stop after 10 s. The car's average veloci-sxywy* .d-arrf(2mi u-u gr,ty during deceleration was 50 km/h. What was the car's deceleration while slowing down?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane increases its speed from 100 m/s a ckgqd ie*ivw94c*:05lk+yeto 160 m/s, at the average rate of qk49wdycce*ie li* g50vk+ a:$15 \; m/s^2$. How much time does it take for the complete increase in speed?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car traveling 60 km/h accelerates at the rat/nn)nenl6 ns -m.6defe of $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cart starts from rest and acceleratezxs -qcukh:ddc3hia/4x 8+i7 s at $4.0 \; m/s^2$ for 5.0 s, then maintain that velocity for 10 s, and then decelerates at the rate of $2.0 \; m/s^2$ for 4.0 s. What is the final speed of the car?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car travels at 15 m/s for 10 s. It then speeds up with 3c*tr ytgt;k27nrtc5 a constant acceleration of;2g*kct5ttty r 3n 7rc $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cart with an initial velocity of 5.0 m/s experiences a co obm(bwc ahnd)e t/j)6j- p*n9ci( t)pnstant acceleration ofn9b6 j(teco /)abpmw)tp) dcjh- *n(i $2.0 \; m/s^2$. What is the cart's displacement during the first 6.0 s of its motion?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bullet moving horizontally to the right (+x direction) with a sp:hmf eju9ar3a;d p.r,dw)+. 6d rcuw peed of 500 m/s strika3a9wdur.f6mep,d: ; hc rdw . r+pju)es a sandbag and penetrates a distance of 10.0 cm. What is the average acceleration, in $m/s^2$, of the bullet?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A jet fighter plane is launched from a catapult on an aircraft carrier. It reacotxca p26m8z5b*xv b/ he/xv*mxo c 26b8zp ta5bs a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car starting from *uqfs ot6 ihgb-.3i )frest moves with constant acceleration of $2.0 \; m/s^2$ for 10 s, then travels with constant speed for another 10 s, and then finally slows to a stop with constant acceleration of
-$2.0 \; m/s^2$. How far does it travel?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car goes from 40 m/s to79 m o4cv4cqemna/uq vt1 9w2g 80 m/s in a distance of 200 m. What is its average accelea co4qm9uvc t 91 g7/4mw2vqneration?

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object starts from rest and undergoes ppb3ph y r3w swj+:ny,3fr7c0uniform acceleration. During the first second it trnhpy3r wwy ,3r3ppcf0s7b+j:avels 5.0 m. How far will it travel during the third second?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving in afdl+gvu ,iyba )/y:: a straight line with constant acceleration. Initially it is traveling at 16 m:aayb+lg/fi,) vdy: u/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car starts from rest and)kslaz (evsq7 5 ,hzv. accelerates uniformly at $3.0 \; m/s^2$. A second car starts from rest 6.0 s later at the same point and accelerates uniformly at $5.0 \; m/s^2$. How long does it take the second car to overtake the first car?

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70#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A car with good tires on a dry road can decelera.,j :+lgmu7f)qi jlv8hydkl 4 te at about $5.0 \; m/s^2$ when braking. Suppose a car is initially traveling at 55 mi/h.
(a.) How much time does it take the car to stop?
(b.) What is the stopping distance?
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71#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
At the instant a traffic light turd dqk:vpr5*l 7ns green, a car that has been waiting at the intersection starts ahead with a consqk:v7lp dr5 d*tant acceleration of $2.00 \; m/s^2$. At that moment a truck traveling with a constant velocity of 15.0 m/s overtakes and passes the car.
(a.) Calculate the time necessary for the car to reach the truck.
(b.) Calculate the distance beyond the traffic light that the car will pass the truck.
(c.) Determine the speed of the car when it passes the truck.
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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 12 m/s on the surfli(y8 w l h)jhbh7yhq/,5ao:,ojf am 3ace of planet X where the acceleration due tohma)wj(l, hb ihj ,oola/hf8q: 53yy7 gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 12 m/s on the surface of planet X whe1o e(yyvq-pbr 6xb(t:0n )hdm re the acceleration due to grav)( d(y:n0xeyt1qh6ob pvrbm -ity is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of rn *g3,mp6x v*wyld9dmy:f ;n15 m/s on the surface of planet X where the acceleratx: r3d*69vl,ngyfymm n;w *dpion due to gravity is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 14 m/s on the nok.ugg(; b q,y8 tqi-l5sn+ zsurface of planet X where the acceler.5q(z gs 8nngt-;,l +bi yqoukation due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Human reaction time is usually greater than 0.10 s. If your friend hold d 9rtt2 j:;/e f)szcsnx*ujvx(s4n9 ps a ruler between your fingers and releases it without warning, how far can you expect the ruler to falls:u * )sd4 vjnzjt9fn;(c2p9xresx/t before you catch it?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown upward pm.f .tvcrd5 +at a velocity of 19.6 m/s. What is its velocity after 3.00 s?5r tdvfc.p+.m

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bullet shot straight upx( i v up1ddt-fx j:x k.;9ytzrse:e,8 returns to its starting point in 10 s. What is the initial speed ofted :jpvsf-z8kde ;r (x:, 19ux.ity x the bullet?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown straight up wi5negn8eqs0q 0a twquo;o be ,+mjv;,3th a speed of 36.0 m/s. How long does it take to return to its starting qbvg5nnj;a+0e0qeo,uo ;8sm ,wetq3 point?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown downrutp1*.r5 hrs xk-gh, :e3c;u 8 hffujward from the top of a building with an initial speed of 25 m/s. It strikes the ground after 2.0 s. How high is the building?1x3rrsfctj. ep;ug:-h h*uu,fk r58h

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81#
 
填空题 ( 3.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown straight up wi4 po/h c2,ap: dp(g5j cs+mlg+0 qrdakth a speed of 30 m/s. (only fill in numerical value in the blana5h ,aqcsl (g:dpj2op4rgk/c+ mp+d0 ks)
(a.) How long does it take the ball to reach the maximum height?    $s$
(b.) What is the maximum height reached by the ball?    $m$
(c.) What is its speed after 4.2 s?    $m/s$

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82#
 
填空题 ( 4.0 分) 切至整卷模式 搜藏此题  
  A foul ball is hit straight up into the air with a speed of 30.0 m/s. (only filq ird4+8w eg5vl in numerical value in wqrvi4 de85+gthe blank)
(a.) Calculate the time required for the ball to rise to its maximum height.    $s$
(b.) Calculate the maximum height reached by the ball.    $m$
(c.) Determine the time at which the ball pass a point 25.0 m above the point of contact between the bat and ball for the first time.    $s$
(d.) Determine the time at which the ball pass a point 25.0 m above the point of contact a second time.    $s$

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the vel8 ba3hg6 6vjnwtx:l 8tocity at t = 1.0 s?


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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the velocity at-u2pypxx gfxog91 94k-1m tze t = 2.5 s?


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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the velocity at t = 4.0 sx *k6p kx,wpz;?


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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the velocity at tuo bp71-7 ehqb = 5.5 s?


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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the average velocity from8 ) ssiw)el5le 0 to 4.0 s?


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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the avera6316v (n2kz uw fnjlbrge velocity from 0 to 6.0 s?


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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the accel wxn/nqur*z+za kz5+czf9 0tb , 5vjdo93u* nperation at 1.0 s?


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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the acceleration at7;xjth.eo, 6fbmx/mn 3.0 s?


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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the avu+3z6 hlnb)jqpfkd3p w c2*3 zk2rfz5erage acceleration from 0 to 5.0 s?


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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the average acceleration fj uv78+t .zd9hzsemd w .myfraf 3-:4vrom 0 to 8.0 s?


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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the displacement from 0 toz)p s9j pz;3ha 8.0 s?


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