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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 :w s.dl2dlh6l. j zj0ca comparison between the displ.6l0zldsd2 j. whjc: lacement 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 instantaneous vevd t2hs xtaxy(-6c8jehga8:4locity?

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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 ty. 6n:teo:+/cpe e9om, ngty uheir car can go "from zero to sixty in 8 s". This is a des+ m 6n/: o .tpy9,oegyncte:uecription 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 hoel-tq m tu:wsic53t0;vsa9 c75 oj 5experiences 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 tr8bs*iog k ,;xmaveling to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceomik, s;b xg*8leration.

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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 slo e+k:nr/ nysz*5t0jc yrd5id (w down as it approrsyi ekc:t 0 5(*jr/+zd5nnydaches a traffic light. Make a statement 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 v(8j / ehhtce3aelocity. Make a statement concernac e(83hhtj e/ing its 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 that the accelerati9ixe fd63, xuuon is zero? Support your a9i e,xfudxu6 3nswer with an 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 velocity change dir3 ft 7 *o(e 3d.96nu7blz,jzl ejbap4kufwuq3 ection when its acceleration is constant? Support your u7 a 4(6eb*jtfoplbzuuzf93. e 3,jk7wd3ln qanswer 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 with constant acceleration. Make a stateme :uzb,x orgxap6 .0sm+nt concerning its motion with resm60 gr +:,sxbz .uxoappect to time.

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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 de.ux iaex1,6 xzz+;jcdcreasing? Support yo,e6udxcaxj+ ;zxi.1 zur answer with 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 v8wns bm mq6i .+pfiom le5;):initial kick, moves up along a smooth hill of ice. Make a statement cl:ims mi b6 5mev+wf.q;p8no)oncerning 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 veloci:m:3sj1we*gi,ct 7m)jv knbvx1 /mlety equal to the average of the object's initial and final velocitn i m v*: s7cgl/mjx:)tw11k,jebev 3my?

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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 akn m (aydzduqp1 snj:3-c.3s-ccelerate at the same rate. However, object A accelerates for twice the time as object B. What is the.zapqyds -1cj:us- nnk 3dm (3 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 fww:9 m2qzel38g + 10ttnoq,0rzj yuxl rom rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of object B?28yo1w r lz et q+39jqtgw:um0 n,x0lz

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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 thhpugjg ue*in5 *28za 85gvh*wbutb./ e absence of friction, whichbe5jun*gptvi g5uzb8wg 8ah*h u2*/. of the following 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 re.yy, m;a ,ll.fvjyl l4st and falls in the absence of friction, which of the following is true concerning i.ylyl;jm. a,l4 vy,flts 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 stateme:xm/* ozgh9lrg)h7j ud).t ghnt about the velocity and thdl))x*r ht.hgg:/ 7o 9h ugjmze acceleration when 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 throvzf2c9gv 74wf g 0(onvwn straight up. What is its acceleration just before it reaches its highg f4vvvw g0cz7o29fn (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 a maximum height, then m0lw y7f98sj qfalls to its initial height. Make a statement about the direction of the 7fwj 8sl 0yqm9velocity and acceleration as the ball 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 height, t9cga1 mm.wj.r0kg+duft) 2 uxhen falls to its initial heu d0u+gf)mka. x2ctwg j. r9m1ight. Make a statement about the direction of the velocity and acceleration as the ball is coming 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 resmt7nunlc+: n7istance. Make a statement concerning nt7cn:+ln u7mits 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-flotqlux3b ob,3izh7gm042 u :iying plane. What is her acceleration when she she reaches teb3hibqxmt07 iog, 2u4zu o 3l:rminal 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 verticallyt;z5-7u xvy f(kp6fj9w r .orz upward with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the serxf.z9 zofwy7k6v5 t;u- r (jpcond 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 second latdz7-hop1cs atw s *(3h0zs 4yder, ball B is dropped from the same building. As time 01*cyszt4-zp3(7hd wos hsad 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 sec :/q3b-whwcm9 d+c kwslq+2baond later, ball B is droppk3q9hacsw/w-bcdw + q:lb m+ 2ed from the same building. As time progresses, 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 talw*-kr(. ft5av,k6(wyyjcp ei l building. One is thrown up, and the other is thrown down, both with*.t jypkw-i(ayrw vefk(65c, 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 the top of a building. A second br6z:lk-,nfdkpog 9(xv k fr- 5cick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of th(-pkn6, gz:r9lkcxf5odk v f -e 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 c/1vyzm2k5;hl7 ye uvconstant non-zero velocity in the +x axis. The position versus time graph of this o 1uyh2l; vzck7yevm/5bject 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 non-zero acceleration in the +x axiaikr1) om nv5,s. The position versus tim)kmi, nv 5o1rae 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 velocity inrwhl8t3o 71g k the +x axis. The velocity versus tirk otw38hlg 17me 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 with codxkf/ n ic2)-:-sbm08fo q+( hrbotdh nstant non-zero acceleration in the +x axis. The velocity versus time grahboqdo:r mf+/d2c h0(ix )-k- tsb 8fnph 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 time graphz- 1ns3 ss fzdt(ab8en;3 uw+r 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 v p)m 149aid( 0esd5eoj cjpccm+hjv ,7ersus time graph 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 acceleratit 64f*7f1pjrf.hi faoon 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 graphs1h2g 6p)gu wu 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 ofb kxv 4:f-c18kgjycw hjk+83d an object is a horizontal line, the object is4y8w+jcxvbch d:k kkg3 f- 8j1

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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 axr/5af ii.vf9 vertical line, the object is5xai rifv9. f/

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity versu6lv:bblrv :2vf. q. shs time graph of an object is a horizontal line, the object is6 bflv :.rvhs2 lv.qb:

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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 graphh0l8kzd;w 5 hzpp7/1u.pn wem of an object is a straight line making an angle ;d1ppw5nz kzwh7 m/0e ulp.8h of 30 degrees with the time axis, 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 the73mgcb-4cm emk jz3,6 ;okn ce distance traveled and the magnitude of the displacement veccmo-begm 7kjzmen;k 36 3cc4,tor.

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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(hx0a uxtxp3n+ 6lwof82rm 8f long will it take to move 12 km upstream in a tlx xa8wforxf3nmhp 0 826u+( river 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?g6yewr9 cb: k;tvp-:b (1 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 avera/ gr/q *ijljwfg*7j 3uge speed in order to travel 350 km 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 marathon3pamt f4 7 a)+m6sn(v nomcav2 (approximately 42.0 km) in 2 hours and 57 min. What i4(6sm)2atanno73v vmm ap +f cs the average speed 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 4r5m3hit1 cp+p wc:zns lr27*x00 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 lievyj*i4,t8v z ght travels in one year. The speed of light is 3.00 x 108 m/s. How many miles are there in a ly? (1 mi = 1609 m, 1 ,v*t eyv84jiz 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 l 8t/l7fo:phto)xk.iut /o dr2ook to the side for 4.0 s, how far do you travel duringt2 px)ot or/8u/i7t:dkol.hf this 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 complete loop around an outdoor track (400 m),//4s*5rmg af4wupzol in 100 s, your average velocity is*z al w4 o/fsp45m/rgu

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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 travels ew5kapf k;w50 /p.rhk 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to i5k/a0wp;pk5 .f hkwrets 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 y-agc8o3o6 thtravels 1.0 km south, then 1.0 km east, then 1.o3 86gtcy-ha o0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the 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 school at 55 mi/h x vzio.k* m9l, mu:sb9qn3*wl for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after v* om*l93n i u9sb,xwql:. mzkdriving 4 hours 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 tekkwccs2;h6: j ,2j iis the average speed;:wcjh2k s,ec26kijt of the motorist 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 3.5sew(e s *9 cs8j 6i7qo8hjvmz0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for ts 59 sme87ic(hvs eqo8* 6wzjjhe 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.* xjk9z0rx/tz 00 h and then at 250 mi/h north for 750 miles. What is the average speed zzx 0/9*jrkxtfor 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 anc ;(6w1)*v l bo/kh.z,qqf8lehqwpo /6xf amjvhorman (the person who runs the last 100 m) for team A can run8lwjl6oh*ezk6x;wp. ()f vq o q h/, /vmqfab1 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 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/cvpz2;j 0u yk and comes to a stop after 10 s. The car's average velocity during decelerati ;j/c pkzv2yu0on 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 gqib:+t/y kb44.sg ff 2nyfd .swd8,ofrom 100 m/s to 160 m/s, at the average rate of g. g .8nybosfy4ki / fdfb:2q,s+4 tdw$15 \; m/s^2$. 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 rate wytfpu-d3x ,*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 an:;x3rcd oaggufx7xij(v- lp;(.8 wnb d accelerates 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 u z0wq *xyw21tz1s/c4x r i n9dfd:g8crp with a constant acceleration o zx:wx91qndtsc1*r/0zird cfw 4 y2g8f $2.0 \; m/s^2$ 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 experienjxl54 bkc6ai9n +dg g+ces a constant acceleration ocigj4a n 6xkbdgl9+5+f $2.0 \; m/s^2$. 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 speed of 50,- 77w5vxf uufsxwb4j q/6fg2* ybzow0 m/s strikes a sandbag and penetrates a distance of 10.0 cm. What ix 72sg bj f yww7,zwv*/ b6x4qu5offu-s 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. Its m2/ud9i5-nlftz n,, 3upgii reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, what iiuplm2fu sgidn5 n3 ,z i/t,-9s 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 91.ej:mzit b *v i, ,ybm9agwqrest 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 to 80 m/s in a distance of 200 m. What is its es2t(bik)s+ p average acceleration?2)+ibsekt (s p

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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 ) +3 4y kux5mdgflsjnf97h(pd undergoes uniform acceleration. During the first second it travels 5.0 m. How far will it travel during the third second?5gj3 m sdk( d+74x9hlpu)yffn

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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 constagv95zjng8wdc +tcb 3f kr0:lkmq,x (0nt acceleration. Initially it is traveling53lc,n vzcr 0(w:mqdt+k gx 9bjk f0g8 at 16 m/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 accelerates up r-pkq w)q;q9 4o1gfcniformly 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 roly )3zb0ln.z:de88ht yllh ; 2 ovx9mead can decelerate 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 .bdk hqg7x+(1aqs4 auturns green, a car that has been waiting at the inte4hxb1s g.aaku+ q7d(qrsection 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 u , pj,ckc1t/zspward with a speed of 12 m/s on the surface of planet X where the accelek cp1j/s,,ctzration 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 with a s4f0md+bd-43 1whv;,tihy)dja adqd cpeed of 12 m/s on the surface of planet X where the acceleration due to gravidb myv4d0 cd-h ha4dd+)t1j;w,3if q aty 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 onq87(754;y *k-u ad lq8nzwpebathaif planet X where the acceleration due to gravl bn d4 -8aht wqp7i8q(n7k*a 5;yeazuity 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 spe+gs i 6tfwtqd772hvu+3. t4m+ctu gleed of 14 m/s on the surface of planet X where the acceleration 6e su 4 t+tqg+dti2g7t lw7uhm+vf.3cdue 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 grea-m1inw v- 6idoter than 0.10 s. If your friend holds a ruler between your fingers and releas6 mnwv-1di-ioes 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 d3(1n0tekw-,af bfckj8*vx y of 19.6 m/s. What is its velocity after 3.00 sx*,tbw1j8ek-3 fky d(fvnac0?

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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 starting point in 10 s. What is the m:p2b)x bzla.initial speed :2lb.px)m azbof 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-c v::ggn6 )yf sge7er.0 m/s. How long does it take to retu7cevr:fg:ng- y g )es6rn to its starting 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 the top of a building with a) kzydwcsx ix6t. oyj*f3 (, w izuj(6w-b0vl9n initial speed of 25 m/s. It strikes the ground after l j x 3si, ztw(c0zo6w i.vd k6j*y9uxy(wf)b-2.0 s. 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 speed of 30in v1629lcit 4rz( cwm m/s. (only fill in numerical value in the bla2ir6c1m tncwzv4( 9il nks)
(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 5ncecqio4 ;4rm/s. (only fill in nu 5;con4 c4qreimerical 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 velocity at t = 1.,bmre q.,*k oi0 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 at1h+ c34k7ex7t8cacsufsyz xid7u2h7 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 vel hdh t3d05:qbkt//oi ;hh:cw yocity 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 isc+ *m5. sjmyem the velocity at t = 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 avbf ig6c1+q(nqerage velocity 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 jf9hw:y et1zedzs4n20b j-k*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 acceleration at 1.0tkutr9z )rbrqh9g,q/ duc0+2 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 ai;1;+ix kmt upq5,ka1szt7l occeleration at 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 average acceleration from 0, r43jan r6pc:kwm b+l 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 accelerationmlo6a6 pz9;.qjsv x - z2pfcv2 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 frh18 rukysn(c/ pki8r -om 0 to 8.0 s?


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