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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 ;.hb z8 frs yam0gqr+b,gqo/2space to another. Make a comparison between the displacement and the distance trav2/,s;g8b ygfzrq.+0moh a brqeled.

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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 instantaneousy.8 s e;ki0reg 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 can go w-gy3cyaq en-le q5q c .a+z( kts)7n4uk v54s"from zero to sixty in 8 47 ctywqc ek +uns-3)g5q4vlza.(e5 -n qys kas". This is 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 e1k7/ d :m6(hp*mx4g0xpsr oqqvnqj 2experiences an 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) qk u8baj/ pp,; lk5sh/begins to slow down as it approaches a traffic light. Make a statement concerning ih q,8p/p au5 sbjl;k/kts 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 direction) begins to slow v z)djqb 4 tyjf-.-.undown as it approaches a traffic light. Make a stav) 4d.uq b.tny-fj z-jtement concerning its 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 with a constant y ;rjd5)c.n3u6oos zgvelocity. Make a statement concerning its acceleratiyon6rz);uog3s cd.j5 on.

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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 m1(a6xrq )j jrig)yt8that the acceleration is zero? Support your answer with an examplirg ya (mjqt)r1j8)x6e.

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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 velocity change direction when its acceleratlcuf5o l h4 uc *,+fmx)tzee4p+s-1ieion is constant? Support your answer with an exa1ieml,5c xczf4psh+ofu eu+-* e)4ltmple.

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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 with constant af,cdo 8su50aq cceleration. Make a statement concerning its motion with respect to tu5o,da 80cqfs ime.

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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 acceleration is dei.nx6n ck9 eb/creasing? Support your answer wit6.xennkbic/9 h an example.

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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 smooth hill ofu59 s56xqcn xg ice. Make a statement concerning its x5ng5 s9cqu6x 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 wwvy.)a cis5qg va2/1 average of the object's initi. 5av wv w)gcaq2/1yisal and 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 jbd7 d- yg/3prm 2iul5at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of object Bldj 5r guy/pim-b d732?

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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. They both accelerate at the same rate.1*3 i yy6 a,6u+3puz apack79wyhfyby However, object A accelerates for +fw9ua*y 1yyazy, 7 bp3ckp36 uayhi6 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 and falls in the absence u,:acdinby /29/l khhvofs6- w44wo xof friction, which of the following ihfos,4 -//ihkuln:ya9 x4owb vcw 62d s 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 rbdjz+m.bfu -k)c,z:f 2*t curest and falls in the absence of friction, which of the following is true concerning its muf2b.kzcm-u cd:j,rtz *bf+) otion?

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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 stateme7 o kp5o9bcpog+ui w7:3o5pvznt about the velocity and the acceleration when the ball reaches the highest point vop+c:po5g 5bo okp wu9i7z37.

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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 -t8 snir4 8imkyp t7p1straight up. What is its acceleration just before it reaches its hightysrpk7-8ip4m t n18i est 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 straight up, reaches 4t is2j28qp mu8im,bj a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the qm 8,iu48 2m2jtjipsbball is going 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 hmyp f*6xvao */eight, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is coming down.f ya*p* o6vmx/

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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 abkw6 +poapt 9f7btl1:zsence of air resistance. Make a statep7zaolt6 f1k pt:9b+w ment concerning its acceleration.

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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-fly/.,jt92tkdmg xb05r: ilzj:l rt9dqding plane. What is her acceleration when jz5,0 d/: t 9qdb2dmtxlj itg.rl:9krshe she reaches terminal velocity?

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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 ide o 7wm9p zjs7-b:bl,drntical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does the s77 os 9bp,:rmzdjbw-lecond 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 seco- zl0z igu.2tfnd later, ball B is dropped from the same building. As time progresses, the distance betweeniz -ztl0g2 fu. 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 du w) ikr1)codwj9v 7t)ropped from the same building. As time pro7idjv1k tc r)w)u9)owgresses, 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 building. One jlq-qv+w,s wy6(y rog/8a+lf m4a ;oqis thrown up, and the other is thrown down, both with the same initial speed. What yv-qmoolj /qq+ywfa;w( rl,a+6 g8s4are 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 the.ek4*r tym19 )itozci top of a building. A second brick is thrown straight down from the samezte9)r *4otcy m .iki1 building. They are released at the same time. Neglect air resistance. Compare the 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 non-zero velocity in the +x axis. The possqw;zp*(6 dpe ition versus time graph of this objspq*6dez( p;wect 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 constant )fkt:xx-qgzrj9/r7 5ql v/k7 jb u8 emnon-zero acceleration in the +x axis. The position versus time graph of thi jkxq5)9vtzgq:b7 lxr rk u 8j-e/f7/ms 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 cons n9i1nx /qan*dtant non-zero velocity in the +x axis. The velocity versus t qannin1*d/9xime graph 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 eo+6tuph 63y85q0 xz,sixfumwith constant non-zero acceleration in the +x axis. The velocity versus time gr mo,zp6uqx 65fty0sxi +8h3ue aph of this 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 tim(+fi:bbvg 3xq)u 8jdee graph gives

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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 graph give0 lflasa b bc bqr:ta*8q058.vs

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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 accelerat*vj(mu/qx/agr6su2 lzf26cfion 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 a velocity versus time p6qh hz2l)d6rgraph 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 horizontal line, the objd n3hdsv 5tjx* /y3,csz4sk9hect iv3z4,jdh/d nsch y 3*tkxs 95ss

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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 graph of an object is ,sh;6 up)4 yyi wnqbw.a vertical line, the object ishqpi4w ;y wn,6bu) s.y

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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 on,qpp3tk8w7 mmd9k 7lbject is a horizontal line, the object is7n,km38 t pql7m9dpkw

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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 tit5p.v m 6ts;rwme graph of an object is a straight line making an angle of 30 degrees with the time wst6pv5 ;r .mtaxis, the 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 the distance tra vo*.tjab/b 7aveled and the magnitude of the displacemenba .bvta7 */ojt 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 (v7h r y;3 ggewzu;lg0it take to move 12 km upstream in a river flowing 6.0 kg0 g(g7;zue rl3; yhvwm/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 ,0 1 a;nxloumt z6tk7,d+vznc 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 0h 8 s0rfa k7jnu,4nuzkm in 5.15 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 (approximate8vfwo yrg) s6l//3aw4m x1ujdvi; 9auly 42.0 km) in 2 hours and 57 min. What is the average speed of the runner in m)4;mj9lg1riu/ w sfwo y6xa /3v8audv/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 itizly4x (lg; 8ap22aydst-1rd take for it to travel 400 km?

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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 distance that light travels in one year. b2xou;fr(kl ) The speed of light is 3.00 x 108 m/s. How many miles are there in a ly? (1 mi = 1609 m, 1 yr = 365 d.k) ub;lf(2o rx)

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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 the sip n); gm54t3pix+ zavv4k l.iide for 4.0 s, how far do you travel during this ina 5vip3.4n+gii 4m pv;ktxlaz) ttentive 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 complete loop around an outdoo480x tm2 ,tm(j 1kk1ohgbj, qrtd2 rjir track (400 m), in 100 s, your average v( j1 jmxodtbt4h2 qgr,2,081mtrijkk elocity is

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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 North Pole. It t gz +ry7lb;4pmravels 1.0 km south, then 1.0 km east, then 1.0 km north, tzm g7;l4b+pr yhen 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average speed?

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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 at the North Pole. It travels o7c/ gx.t4 -h/ x np.zf; kdsugznr/-iltr/n,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 o;gctz/l/r u,-dih . x4/zgk.nf /r7p nsntx- bear's average 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 .ps,es 2ikc6*y nq6cs school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometow,sy6 e6ck.pcs 2 qi*snn 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/h5*nl qqj oc/ekom0(h+rg 9xa -. What is the average speed of the motorist for9o-xg 5a jcom*0n/qe+k( rlhq 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 9b:ee3chj a ;yx*7rik,5 uk opat 100 km/h. What is her average spee;pbuy kr 5*i3 oxhj ,ke79ca:ed 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 2.00 h and (i li:0(yh.w evf3t6ey7pxpv then at 250 mi/h north for 750w6( py70l ixhe:(fy3 tivpve. miles. 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 anchorman (the person who runs the last 100 m) forbf 0fu)z13ax 1;tqjf nhc* (ao team A can run 100 m in 9.8 s. His rival, the anchorman fo q1 t b0conhua(f1;)x*afj3f zr 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 starts 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 uniformly and comes to a stop after 10 s. The caqo z/szu+ ua01r's average velocity during deceleration was 50 kz1uz/aqus0+o m/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 to 160 m/s, at the average ratoynb gheg()(.v0 p 3ure of vgbe(3 (nhp0 )ro gu.y$15 \; m/s^2$. 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 th: hg58dddj,sm e rate 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 accelera5bt7d2v*uv u2ea noc3 .6hdjttes 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 stmer1f2: sdc9mwsqsu xl8, go-f47 u(peeds up with a constant acceleration of d sot,2e r s17f(4s:m8uqmwful c 9-gx$2.0 \; m/s^2$ 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 velos1 xwry/i, .lz(0zkv z*zq4 xmcity of 5.0 m/s experiences a constant acceleration ofq.ymzsv/z r,x (i0 zlzw41x*k $2.0 \; m/s^2$. 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 di0 6p)zx whq pq5r ax).yp,0sylrection) with a speed of 500 m/s strikes a sandbag and penetrates s6 y 5xhp)zqwpxrp) al0y.q,0 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 l mklm 8iaw- ,hjn,6yt8aunched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, whatmmj,yk-t in, l68hw8 a 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 rest moves with con zwnxef fz7*pe)u0wh1wk.3+ kstant 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 to 80 m/s in a distance ojv; x0m*5nf zoq6z0 ,y vx-m,ubfjk* qf 200 m. What is its average acce;xkzvn0jqxv6 mm*q -u b,,f jfz0o *5yleration?

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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 uniform acceleration. D0 z-uwakwwb 2*uring the first second it travels 5.0 m. w * 2wwub0k-zaHow 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 a straight line with constant acceleration. Initi4hbcejkr .2- y ;;gsr,dra1b vally it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far dcd4rh- b1 b.,ks2; rj ;aerygvoes 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 accelerates uniformly ,;d y xd ov09i/ixpyk3at $3.0 \; m/s^2$. 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 decelerat;2 okcx .ptejms6 5ar0e 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 turns:ge fl1ojsr e: -*(-/ dbmdnky green, a car that has been waiting at the intersectionfg* -1::(d j-k/myble ros den starts ahead with a constant 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 surfad l*n stx+eqp14f*zo-ce of planet X where thed 14 n tols*x*qz+pf-e acceleration due to 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 b)r7 ira12pp4-bo owh with a speed of 12 m/s on the surface of planet X where the accele4brwr1 bppih a7)2oo -ration due to gravity 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 15 m/s on the surface of pve2 1pm4j bwq6lanet X where the accelerationeb w4qmv pj216 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 surface of planet/s vlfkdy5 ..z X where/k vl.y.d5sfz the acceleration 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 usuas z-qap zj-lj/1w8s )plly greater than 0.10 s. If your friend holds a ruler jwsaz --p1z)l8qj /ps between your fingers and releases it without warning, how far can you expect the ruler to fall 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 at a velocity of 19.6 m/s. What k/(wjv e.smex*o o- f6is its velocity after 3.00 sskjv6oo*/eex( m. -wf?

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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 up returns to its starti.l,w4qq4 k//hcv /hqz xa rv+rng point in 10 s. What is the initial speed q a/+k4r/wq,cq h4r z .lxhvv/of 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 with a speed of 36.0 m/s. How long do7 rvdj 5,iul:pes it take to return to its stlu7v,jrp :id5arting 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 downward from 96f9.dxnz dcri 3 hc75bfmb-sthe top of a building with an initial speed of 25 m/s. It strikes the ground after 2.0 3c9 .x d dz ff7-b65msrnh9icbs. How high is the building?

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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 with a spee)sm ksh;e- n:xpqwu/7 d of 30 m/s. (only fill in numerical value in ths-); u7 xskmpwq: neh/e blanks)
(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 sangqa*ihoi6s-8 z q0s -8 mo+atraight up into the air with a speed of 30.0 m/s. (only fill in numerical h gnza8i0 +a-ssqo*a68m qi o-value in the 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 velj 0cjw/7:)lbcphf,n r ocity 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 t = 2.5 slgynz xw xy*9s)dz q;q+n3)* v?


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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 vel;mjeae,kb h-l,(/ eml ocity at t = 4.0 s?


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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 dfca*jkb.9 :0 b*tckat = 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 vcm ;cb/ub6r2- a1zi)em +feyjelocity from 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 average velocity 3+3tylr) f2 xkg :o;eb kgam7adgr/q7from 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 acceleratiofism9wl)k ylw 5y15c) n 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 at 3.r(g 8hs 5c zpvy8t.pvku:y1uap39 7rz0 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 average accelibt 5bi.0 rd+akt6c7i hw1 .okeration 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 acceleratsb 1mvk, 44pkuion from 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 to 8.0ed ,f /0jzjw92-qhmha34ref s s?


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