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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: 匿名未登录  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 compxi 0umjc4 -7xuarison between the di-x7uu0jcmxi 4splacement 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 instantan t 0t)*cxpf1sl l +0xmiuy1y+qeous 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 "from zero to2)uqc3 ;x08b)3 jdgkaozw iq,qpps9xt rx* 2t sixty in 8 s". This is a descriptioiazks 3 bjx,0p c)ug 9q tq3x2x8*pq)wotr2;dn 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 experien-wjco96 dj9j dces 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) begins to slow down as ibq :htd lc.uy.9jh+ r/t approaches a traffic ldy r9 hb:tj.uh+/c q.light. Make a statement concerning its 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 zxps /tifdny* /4t95t West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concern* 9pttn/ xd f/54zytsiing 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-atuf,/9x :+bpuordf a,joy( ath+7 b is moving with a constant velocity. Make a statement concerning it bu:+ ,+rbp taod- 9/t7yofaauxfh(,js 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 objes:cy 0hcr l+r9 z*s(qwct is zero, does it mean that the acceleration is zero? Support your0(*rc +wyz qsh slc9r: answer 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 direction10h+j3;tc (a8sqx:ibvkzm*ifkd 2 jx when its acceleration is constant? Support your x vicd j*j ;taxsk2ikf(h3 q01z+:8bmanswer 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 mobwj (huleq6n96 wcy7pxcpu2l5 nh::0 ving with constant acceleration. Make a statement concerning its motion with rel6:u l2:cwn p6jce9(np5xuhqy h0 w b7spect 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 5c vyya:6dgc)speed while its acceleration is decreasing? Suppor5d:cy)cy va 6gt your 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 wy8bu4k66p.v/ tft sj an initial kick, moves up along a smooth hill of ice. Make a statement concerning its a8.vf bkut46s/ 6yjwptcceleration.

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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 a;axx,l/w /mxc v(d71v b0vatcverage velocity equal to the average of the object's initial and final v/ mt0 1b(avwva ;cx7 xv,xldc/elocity?

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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 rei o9) w6 qmyp1eqtr;e72kr9qo st. They both accelerate at the same rate. However, object Apitq2w)oo67 r 1k;q y9ere 9qm accelerates for twice the time 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. They both accelerate at tpzv62cp)sz ; 9tl- vnxhe same rate. However, object A accelerates for twice the time as object B. What is the pzl2-)vn 6v9 pz txs;cdistance 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 qsy/0r i erkz:x7i8s*absence of friction, which of the followiixz s q/8ery*:0 k7sring 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 rest and falls in the arr45 8rd-csgw bsence of friction, which of the 5rd4s gwr-rc8following is true concerning 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 statement about the velocibrz hp vxekd 47.b.;o8ty and the acceleration when the ball reachb.vzh ; .78bkod 4eprxes 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 stx1gx;ang bx 5kv6 m+-uzn;c9braight up. What is its acceleration just before it reaches its highest point?x g+gv5nz m1k9cxax ;-nu; bb6

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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 straigha0 lk3v7y)a cqiehfpu 31 2+oll 8bzaugt :.b6t up, reaches a maximum height, then falls to its initial height. Make a statement about the directf gt a7u)c 2bapk3lva 1b z loqe3+8ih0ly6:.uion of the velocity 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 he0a-cexyq:+ t5npow )ltv8*cn ight, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as thee-x8n) *wc ltc5qv0a yot +n:p 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 downw g;002ksu v) /tdwmdimard in the absence of air resistance. Make a statement concerning dm 0m;2tvig ku0/s) dwits 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-flying plane. Whaxn.wgz p95 j b*xj15vct is her acceleration when she she reaches t51pvnw * xb jcx95jg.zerminal 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 identic6jz 1l pjr44zzr1 6yzmal 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 tlmy jzzz1j r1rpz 4646hat 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 later, ba6g yp2tojx8f1 i(qifw-a3 :p lll B is dropped from the same building. As time progresses, the distance bp(wgqf- pi 1 ya32:lifj oxt86etween 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 bu3emxb ;rf7q 6kilding. One second later, ball B is dropped from the sq;6e3bk m7f rxame 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 t p *h0;g 4 d9fgd13arz9cuuun-e oj8seall building. One is thrown up, and the other is thrown down, both with the same initial rd4819oze9snu- g;0hjguep*au fdc3speed. 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 brick/bki5ij me:gbm; s59y is thrown straight down from the same building. They are released at the same time. Neglect ai/bs5ji59 b eymi ;:gkmr 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. : xpd6zax1+qw )wn *uxvhsv*; The position versus timeq n;xx1wvx za+ h)s6p:d *v*wu 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 b( llm 75klyb 4s0k3chwith constant non-zero acceleration in the +x axis. The positioyhk l5blckbl4m0( s37 n 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 velocity in the +x axis. Th o ;qd-(l(ya4vk dzrg1e velocity verszokd4d( -ylq(a ; gr1vus time 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 constant non-zero ac ,d.cgsom1a,vh7l xt 3celeration in the +x axis. The velocity versus time graph of this object ,xa3htd 1c vl7og ,ms.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 verszhc);(wp1 dmalow ow gf t3+/-us time 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 veloc:fz vlt nol,:;ity versus 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 acceleration versus,hu*)o epsn;n2l (hgl2 ekn18 .klz mm 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 velociio2:wdo76zlke5df 2 hu6 7k wxty 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 lea2ougbe70 0a horizontal line, the object i7u0 oe2al 0ebgs

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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 grapmef5c u(rfooe5/b q 5 :y vvq1cbv4,k,yzq9 d.h of an object is a vertical line, the object isfu 5vc.d,cvq ,/9zvbb4foy5m y:o erq(1qe5 k

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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 o voj4vg(4i 3iyf an object is a horizontal line, the object iogjyv( i34v4is

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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 a stmqz2i2yl 3flag /i5 4iraight line making an angle of 30 degrees withzml y/a gf l23i2i4i5q 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 the dist6m qcniz*la-w6 )ltf4 ance traveled and tfza-q6i6)4tn l*clmw he magnitude 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 watw c7s6-ou fp.*)cs0ab5e uzj per. How long will it take to move 12 km upstream in a river flowing 6.0 kmp .zs6w-j u7ac fsoe05cu)* bp/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 mi = r/,26j mcds*knm) gti2gw;na1609 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 o *n a/gw(w hv)5-lyfr l 9xl.e.;sgvkcrder 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 maram.u 179jlku ;avl2wsn thon (approximately 42.0 km) in 2 hours and 57 min. What is the average speed of the runner inl.uv;jn21w alks7 9m u 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 km?h *bfkx 99+wqf

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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. The speed of tq 7csptc.c 4i xgm3n7 ykt*jpq.(t0) light is 3.00 x 108 m/s. How many miles .q7tp)(p 7isk4tc.0*cg ycjtm t3xnq 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 .kzl9vq sda5 p4gd +r/km/h along a straight road and you look to the side for 4.0 s,k ls9prd a5d.+v 4/zgq how far do you travel during 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(vezb4v 6 kr3t), in 100 s, your average velocity iskzrv4( 6tbe3 v

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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 1.0 km south, then 1.0 km ea1l;hn q,29o +vysyu mgst, then 1.0 km north, then 1.0 km west to return to its starting point. 1h9nm 2sqo,+ yuvgy l;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 t3fd0b r4 *k3 rl5riw-,cfgvtaravels 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. Wha3fr lw0 3 c*avig54r kdbtrf-,t 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 6 +;tzem7bosq55 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 homez t;semo 7bq+6town 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 ( eugi0+ zxpa7average speed of the motorist for t7 + pxui(e0agzhis 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 2/2 db/ e5wx6pzv25 b-qip8m1 plmutvd.0 h at 100 km/h. What is her avera62mdzv/51 tm -pxqwe/5 b2d vb8l pupige 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 2.00 h and then at 2puz.uzdja9w dn-e i4x8r8l *, 50 mi/h north for 750 miles. What is the average s.ea-u,d*n lu r9zw8jipxz d48 peed 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 thevckl: w0q tu1kk5x3 -g(+gjcz 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 coveg3xwkj0-vu k1 c:(l+cz5 gkqt r 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 car's average vnsc v4l68cexhv rx+, hn i2;s1elocity during deceleration was 50 km/h. What was the car's deceleration while slsinvr4 xe1+ 6 nh;vl2x,hc8 csowing 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 6f klcurx;o(76evrr :x m ,.jlrate of x uvfe:6r,k;( .l7rm xjco6 lr$15 \; m/s^2$. 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(v bkp)ggxs-3 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 accelerate;r.njsl -rxv/aqim,2qghs *: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 sw4o pxj2b ztu;.jj8 suf, yb2.r +q)bup with a constant acceleration ofrf .by ;. su4bj),pb2x8q 2stou+zjwj $2.0 \; m/s^2$ 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 constabf) 0c*ru7ebr nt acceleration ofu7b*0erfc b) r $2.0 \; m/s^2$. 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 directo, -) )hpame7cg gwv2dion) with a speed of 500 m/s strikes a sandbag and pene-mcoh2a vdg7)gp, w) etrates 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 *nt pejmsb vqb2j*7 e;cttd25,+n 8vxfrom 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, what is the length of the ca2qsx e 8;b*p5+jc ttn ,jntvm7dv 2b*etapult?

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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 const/ 3p3ywrd j9vlxwos6-o1 tw8fant 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 dir/ ngt8 ju *hx/)9pxlfstance of 200 m. What is its average accelerati 8rxj9l/*p nhxu/f )gton?

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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 avhp89o zgi36qzeyl7)a a8. rt, zhjq8cceleration. During the first second it travels 5.0 m. How far will it travel during the thirdq3 98eahz,l8qr6.ayz zh tgv8 )jo7 pi 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 iabu4 io +z0fa-n a straight line with constant acceleration. Initially it if+-aa04obiu zs traveling 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 unifhgf u*x1dadb.u/ .. txormly 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 f7c9 w lal6(nl1hr+s cdry road 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 turns green, a car that has been waiting a luu ak2m 8u6ci3ely408;(ja jvf j.dat the intersection starts ahead with a constant acceljuec. k02l6a3lf;vu uiy 4(8adaj8m j eration 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 surface of planef-x 0iny69kqsha h/q( t X where the accelera( inf- s0qh qh96k/axytion 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 n; )q;gje ,+klac bu,mwith a speed of 12 m/s on the surface of planet X where the acceleration ;l ,km)jqan+gu;ec b,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 upwar38w c9my8ln2x c r /wo,qj1todd with a speed of 15 m/s on the surface of planet X where the acceleray3nw m,jd98/ltxoc cq1 r2o8 wtion 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 thn(1)qu jn6nj fe surface of planet X where the acceleration6f nq n)jun(j1 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 greateruip 4gvpnc *,y8f;2ttq 0 1ea6nl(p ly than 0.10 s. If your friend holds a ruler between your fingers and releases it withn u84ile2y(ppfp lt6y0a*t 1q cv ;,ngout 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 is its velocity af we0w1(jpz k5epvx s t+((h+lfter 3.00 kj 5s1lzfp0 ((wwetv+p(+h exs?

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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 poiny )8n c1-rzt+m/qpttq t in 10 s. What is the initial speed of c-tty+r/qq1 t8) npzmthe 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 3p4lhi y0 -xt6xny,ctof 36.0 m/s. How long does it take to return to its startin-i6 h0 p43yxtxyn,ctlg 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 an initial tfhh*v5k 5s r-(hhwp7speed of 25 m/s. It strikes the ground after 2.0 s. How high is the b-7ph h h5ws*f(rt5vkh uilding?

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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 stramg6rv:u 4 oey-:)qlc yight up with a speed of 30 m/s. (only fill in numerical value in the blanl:)ru6 qyoy:4 ve- cgmks)
(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:9mnc 5x)smoo 30.0 m/s. (only fill in numerical value in the blank)moo9 x)mscn: 5
(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 = 1.0 s?i6v, t 2*hxksp


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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 57yush* ktx9f fs4-k6 foh/yu = 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 x2wdu4a42 0fyt4tyw9 6*p+dus mwy1 cpkfc)x 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 t = 5b97s /j41gaug wxj9xh.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 averagedh6fz-;w f6yp*sl5kf q( cbx8xy2g;x 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 from 0 to 6.0jrc;1 5bnbxgi,7*lv0qa z vr3 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 /d m: z(sg9okuthe acceleration 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 tjs pnw97j ;:uyhe acceleration 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 00gr 7v sgsu:cf8q): bxghe9l: 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 from 0 to 8.a.(lhirop 3na8jxx er,jt )l5q di k2y7a82x80 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 ctqi an4 z/ts0g7q)z/ from 0 to 8.0 s?


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