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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 +k qbral qabp6.p*a8ga 1rq-:one point in space to another. Make a comparison betwelg 6 qkp*q:+1aqa pr.a ab-8bren 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 vel-h,kro *9m)y; izb svbocity of an object equal to the instantaneous 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 o4 zc-mvmp/f6"from zero to sixty in 8 s". This is a descri4 v6/o-czmfpmption 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 thevswh :u e/wunf(3ry:( +x axis experiences 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 togvgtz(v8b*.n slow down as it approaches a traffic light. Make a statement con t(8n gvb.*gzvcerning 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 th ndp s)ooz: 6p3(mm(ime West (-x direction) begins to slow down as it approaches a traffic light. Madi:mz(p o3m)son (mp 6ke 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 velocity. d y0ixip +*qe*Make a statement concerning its acceleratq*yeix0pd* + iion.

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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 tmlh21 aui6rfpsmex8, y** 2vn he acceleration is zero? Support your answer with an exampleie *2mlran*y61xfmp, u hv2s8.

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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 chtw;9rm d4k:zk1greajmrv )3vtm5 ; a5ange direction when its acceleration is constant? Su;r vvra1ja5:3ktz5r) ;kem wmmt 94 dgpport 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 with constant acceleration. Make a r+i w,g0* prczstatement concerning itsizrwgc, + r0*p motion with respect 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 accelerasrw/2*g 9la 5)s nymbd.;lfqation is decreasing? Support your answer with an exam/qarwsmf ld)ns. l2; ab5y9*gple.

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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 i:npiu, s/j z5kick, moves up along a smooth hill of ice. Make a statement concerning its accelein ,/ iz5:pujsration.

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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 ay1qe* av ljik ,sj)tx4wj9+bp v32b:n verage of the object's initial and finxj* 9:41 p)ietyjb+w3an q b2vk,slv jal 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 abkxf1fo t jb-, mt;ottfm5qy0p ++*1pt rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the finalj5+fbpmxt1 t1ptbmq -0k;+fot ,oy f* 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 fr v.njqx9gdo(;cjrl0cfl61. l(h ob3tom rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is co9qno.jg6c xb3rhll(v0;j d1t (fl. 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 fro5-m:cuea7 dh g0 bfrt*m rest and falls in the absence of friction, which of the following is e0r7 magct*h-ub5 f d: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 absence of fdskh8ynm 02m ;f2gf b75:vgxlge3,pfriction, which of the following is tr;fedf: x h5n2l vyg37pbf20g8 k,mgmsue 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 stag+t:(ndn d*h9av m )sytement about the velocity and the acceleration when the ball reachdsndm(9g* ny: hvt+a )es 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 throw gg)gc yiee91ap8c. yycx/)a5n straight up. What is its acceleration just before it reaches its higc)g9 8ica5 y/ge)a1cygy. pxehest 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 heiy- i iy5s,v.7m xrpdy7ght, then falls to its initial height. Make a statement about the direction of the x,5p77-.yimid vysr yvelocity 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, thkf3dxe(g 5 ixoz27e3l en falls to its initial height. Make a statement about the direction of the velocity and acceleration as dfil2e 35xk3z7xoeg ( 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 resinbpnk 85.h*r 6hh,viistance. Make a statement concernrn 6,ihv. pknh ih85*bing 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 5vx96 y5eqkcofrom a high-flying plane. What is her acceleration whenexo6 k5v5 9cyq she 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 wmq3+ vjq67f b;fcnlrrttl0(p f8 ( c;hk6 ybf0ith a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). Whathjm tcr6rf ltflvk807; ( (qf0 bnpb+36y;cqf is the 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 llnd yctzr74nvf , 7ef44a(:-c,l0 rpgfnx1xof a building. One second later, ball B is dropped from the same building. gy px17c: nl-0(na x,l4lvn7d f, 4f4trfzecr 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 laterx+ nvbwyo) )5ylupe) d;en76f, ball B is dropped from the same building. As time pro) 7d n5 lnvy)ewyb ;ufx)pe6o+gresses, 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 trh; hzvgiv (2:e)bl*t 36maibhe top of a tall building. One is thrown up, and the other is thrown down, both witha(;)h ir3:vtezlg6imbv*h b2 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 brick is thrown strv0s*yobv: rf ee te q;yvhl*tv08/2w 9 0npz2gaight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the yh vs z:lw*02t9vebe2gp80rfve *yvot;n 0q / 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 positio771 2ww khm) i;unh1sqckh 0;uzrdo k4n versus time w7m0kkkwh2 u od h;qhn;r s1zc1u4)i7graph 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 4fkf(;qbn c g.with constant non-zero acceleration in the +x axis. The position versus time graph of this object gn;4bq.kf (cfis

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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. The 5 inyt.y 3nfoz8(zo5j(hnb3 -y4yp(3mbctut velocity versus time grapbm3i t.z tty(3h3unzjpo 5(fyby4- (58ycnnoh 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 wit 22.dr squsyp4i1mf2wh constant non-zero acceleration in the +x axis. The velociw ds.2imy2p q4u2sr1f ty versus time graph 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 grbh8i0(7kq m8(jvg gdxaph 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 velocigf ew(ka *qtjbut1xdur,*8*)6yf t4wty 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 versu) gl1-onnhny5ij) 9mhs 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 graph givesifrku9s 6 k-:b n+2kg+rhth:72s odzh

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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, z6/i 2zmn/j,3uj+jih msbkq,h,kd+wthe object ism i+6bku/3jij/zj+,km ,hzdwq hn,2s

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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 grapl tz .ily7t*c5h of an object is a vertical line, the object isylcz.t i 5t*l7

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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 h ,pewj *-ux dzs8w 4k;0sf.vo -jbk7u8cy7il uorizontal line, the object isj 7*ywfwuu4bopcuki-vd ,;-jzxse 80l.s k 78

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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 straight linbq)h b/sftw f;j (6m;ft tr7o+e making an angle of 30+ f bjtr ft;omfq)h7bw6;s/ (t 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 st u15bfo;+n os:v uhj;outh. Find both the distance traveled and the mao1;:5+f o;ns u hjbutvgnitude 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 wil+ apc whz-38uy:kwtnp4aib8 : l it take to move 12 km upstream:ia zk48upwh-38c+aw y:b pnt in a 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? (1 mf)-y57v y axlko5,v/7/( ke ovclff uzi = 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 uazv: 26(d 4kil;oe 1wu gex fm5*p3.mkfmpr: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 marathon (approximately 42.0 km) in 2 hours) k.dizofu(6l8r b)2-/wrq k vekrvi1 and 57 min. What is the average spekk lie8q).u6 (z)v/r r v-i2krfwo1bded 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 t3v h(4gbspcd1o 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. The spee(x/x)q jckiuoqh+ (0.1isupy d of light is 3.00 x 108 m/s. How many miles are there in a ly? (1 mi = 1609 m, 1 yr = 3 ps(ih (/+ uko)qi.cx1y qjxu065 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 rlv5uce54q kow g07(n koad and you look to the side for 4.0 s, how far do you travel kqg0vw45loc(ke5un 7during 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; 1a8piselr7gt-7hv 0e9lbb s around an outdoor track (400 m), in 100 s, your average velocity iale8s ;0p -eivltgs77bh 19b rs

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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 tr.zlp -akiz4( ,ktyv 8b,b) cveavels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to itet-k 4 )p,vz8kbc ,z.iy va(lbs 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 No/uexlc. 0-qzk+xj t-k rth Pole. It travels 1.0 km south, then 1.0 km east, then x -e/0u+.jz-cqlkxtk 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 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 atn vk6.; pk6)puyp 0d:pzk2-l,ghlly y 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 hometown from schoo yn2z6.lyp)l g0-lv6p dk k;p ,p:kuhyl?

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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+em)e ;vv ))c5ui xw*s pbu:uz;eau+ -hpsx)s is the average speed of the motorist for this trip? -5cze+vwx;s *e)ash +)))pbmx ues; :iuvpuu

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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 hiso7 zu.j1qn: at 100 km/h. What is her average speed for the tripuin.z 7o1j:q s?

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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 fo6mbd5yj um, k2io6a5xlj gh6)r 2.00 h and then at 250 mi/h north for 750 miles. What is lmdb 6,j5ajk 2ihmu6o 65g)yx 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 p3i4*eh l5 1xklrq q2qserson who runs the last 100 m) for tea1 ikh*5q42lxq e rs3qlm 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 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 afterxdx3.+os-/ze9i j 4f yzy )dgx 10 s. The car's average velocity during deceleration was 3)zezx+id /f49jd s yogyx-x.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 sp(xrwkm 0.zl3*avx r,h eed from 100 m/s to 160 m/s, at the average rate of 30ax,l hx zrm(k w.rv*$15 \; m/s^2$. 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 0l-d gjpzo w+8at the 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 r(c bt 8.uofrm1est and 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 s i;k4a3xbohd m(tx*x9peeds up with a constant acceleratioktxh;bad* x93i4m (oxn of $2.0 \; m/s^2$ 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 constant accr27 + 0;a*rroui4kpaotcjx )jeleration ofa ojau 4*xj;p)r72+crri0ot 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 hori-vf0no0bj3zw;/xiu p zontally to the right (+x direction) with a speed of 500 m/s strik p n0fo/vuiwzbx03j- ;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. Itbsrb;w3;awwhea(-w4 reaches a speed of 42 m/s at the end of the catapuwa ;w3b(w4bswa;rh-elt, 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 rest moves with constant acceleration of e,utyma98) 5qd0vs cyqb8t 8b $2.0 \; m/s^2$ 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/w/0,dtsd n; kis to 80 m/s in a distance of 200 m. What is its average accelerats/,w ktn;i0d dion?

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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 acceleratte 96t+ ,v tp7p4clxmxbp-5 fpion. During the first second it trav4lvxtmct +9 -x,p6tep 57ppf bels 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 a straight line with constant acceleration. Initially itlcsi2ev(b5l-h 8h( p k is traveling at 16 m/s. Three sec-le lh8kbp5(iv (hs c2onds 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 uniformnffjqo03 d9fvg 2mr* ,x6: vo to u:qor;h(9yaly 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 roa1h 9wppu-qd5*c e m5h6tgglp 2iy8:( nqrurp/d 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 been3g9 st8l. lgqq waiting at the intersection starts ahead with a constant acceleration of398l ggtlq.sq $2.00 \; m/s^2$. 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 o ) lu0bsq1:2uzxbwkfn6c: a q.orck9 5n the surface of planet X where the acceleration due to gravsc:b:lau 2w.0qn 1k9rb5qxz) 6ufc koity 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 (py tl1 )s*r7u fotiy9of 12 m/s on the surface of planet X where the accelt f*l u1st)opy(y7r9ieration 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 sx3 u0 f5er /xcvh2x8xwvns)5 ppeed of 15 m/s on the surface of planet X wherfs)8 vn053rv/ e xxwp5h2xuxce the acceleration 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 u vmg( )tm7e/t:ng4v-(8b y ni rvv7adypward with a speed of 14 m/s on the surface of planet X where the acceleration d8 7i ndg(tmtv rv)4ae:gb/7-vyvnym( ue 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 is1 fo7f rdh54tu usually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without wat74 dhfu1f5r orning, 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 velo0qn0of;f.zc wbvdj1;city after 3.00 s zo0bwqfc v .;01;fnjd?

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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 starti0mc.mv/cmcc m 530 t)ouym0zlng point in 10 s. What is the initial speed of the5coyvczm 30)0 c.m mlu 0tmm/c 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. Howgu,vyn ;2 *v*n//hy.h1 p pu)ty-o l3uhuobb g long does it take to returbn g */blu1 pv hohyu- 2* uop.htuy/vn;3g),yn 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 an inir( d9yb)e5hz gtial speed of 25 m/s. It strike5r9zy gdb ()ehs the ground after 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 30 m/s. (only fill in numeri n +zu*6ttznll./4sp qcal value in the bu/6t.t q4 llnn+*p zszlanks)
(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 straighr1k37s- gb+3vfhh h:dt8zdc yt up into the air with a speed of 30.0 m/s. (only fill in numerics hg8tz3:f-kr v+c1yh 3 dd7hbal 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 = 1.0 s?ca ftr4z: h:h;


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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 tu bp- u)t;l6hat 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 velocitff2hzcxw 0 +v melt8ef(r6-6ry 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 veloci-n ihp)i*iufg;/ m0znty 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 average velocity from 0 to 4uk aq30s4c6dz 9m4lqestiy /;.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 averr-m06hk rz te.7d -dj(wd9c mbage 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 accbkico:. 0j f(; y-q.l0wgqixceleration 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:a3hkrbbt*6-s0tqc dwh8 : +y/q ymar the 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 ac e)/vr236wxtu,jt yn 7k v5mukceleration 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 accelerationbj1b42 l5yfw/tlu2-golc6 c f 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 8szj4usqkn;2/ e r3ofto 8.0 s?


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