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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 fromzp;n spm1y s;4ti+f x1 one point in space to another. Make a comparison between thex4zntp+m s f;siy1p1; displacement and the distance traveled.

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When is the average velocity of an obp9b03w5ac8srmwzsnb,,, z z2wb +zkhject 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 thq nputbb9 8 vwi,)59yxeir car can go "from zero to sixty in 8 s". This is a description ofiv)qb,u58n w y9xpbt 9

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object moving in the +x axis experiences an m1otiycf6d,js +d; :b 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 tr4dta8fj(b *w04yj x pqaveling to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleratio djtyqa4wxf b48(jp0*n.

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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 down as ix +7o ew dhce+t)ot8s;t approaches a traffic light. Make a statement concerning its accelerat+o8w7; tscxtheo e)d +ion.

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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. Makgi8gm ea*. + h6 fag(wr;swhw4e a statement concerning its accelerati6;*aww8 afs4gheg.(rmw + ihgon.

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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 isre*krlxf )x6(w uz1ue1yu51 s zero, does it mean that the acceleration is zero? Support your answer with an ex*1rxeure yw)6uxs51lu( kf z1ample.

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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 acceleration is con38 xwv6vkgt4 jy3d;6rrpk (qb nah 3qt:+8lplstant? Support8 38ln 3xayr g:6q3hjkpqd(twkv br; 4t6p+lv 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. Makee:y a3 ll a-v(0)fpphj a statement concerning its motion with respect to ey(l3: halfp-v0 j pa)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 increasld3eh u7 2j2r.o+z9qw/ zqp:pju6q h cing speed while its acceleration is decreasing? Support yojp jz79qqlr.hupzc: 2o 6/2u3qedh+wur 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 initial kick, moves up along a 8ti7 04 ognajpsmooth hill of ice. Make a statement concerning i07po4a8 tngi jts acceleration.

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Under what condition is average velocity equal to the average of the object'xld.uf. bj0 u++3n*t lc4rm nks initial andrcd .+unu x.m40f kjbtl3+* ln 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 accelera .2/dazat t2qyte at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of adq 2tay2t/ .zobject 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 acceleratew; vk)q7a lil/ at the same rate. However, object A accelerates for twice the time as object B. What is )/v7 ;kiaqwll 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 iny f*-uaxv;8 g0 hyn2yy the absence of friction, which of the following is true concerning its motg f 82v 0yauy*y-;xhnyion?

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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 sdj ,uizxr1 uv-02x 0nrest and falls in the absence of friction, which osu 00juir,v1-xznx d2f the following 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. Ma 91 twxd2m qbwl;j,t8xke a statement about the velocity and td lj; mx w1b,qwt298xthe 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 thrown straight up. What is its acceleration 011hn5lmd. + pmvx 9sjw)z vzbjust before it reaches its highest po1.lv xzpms n09dmhjv) 1wb z5+int?

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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 falls t jnf ah)5;6v0bjva05 vswkae *o its initial height. Make a statement about the direction of the velocity and accelerawb*;e05ksh)v 6aavv0fajj n5tion 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, re ur56+ p lt9yhqww,q4 k8qn+pk 6u2zfhaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity ar86hz,ltq nhup95q kwpq yw4k +f26+und 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 thrycfl+3+wqs.dm khv( )own downward in the absence of air resistance. Make a statement consvmw l+yhdc) k+ .(3fqcerning 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- qw,m2xjw/x f43.qt sjflying plane. What is her acceleration when she jwqj 4 sf,mw./xqt2x3she 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. jtfsg7d 2 n) 6;3qztk5y5uf hgAn identical second ball is thrown upward with a dfstg3hkgu yf5 2jnt)q76 5z;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 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, bal l03f.tbd45 k:p pwkpyl B is dropped from the same building. As time progrestkw3kd4 pyp pb:l 5.f0ses, 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 secop(2lxxt z mh4ip2 c)-ond later, ball B is dropped from the same building. hxx m )zoil c422-tpp( 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 tall building. Own7iy wv a2/;ebuf- 7xne is thrown up, and the other is thrown down, both wiuw 2 ve7 /f-abx;wni7yth 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 topfi ah3vl5,0d1 oav pmbk cl958 of a building. A second brick is thrown straight down fromb k fcl5 8hopdlv159a0im,a3v the same 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-zerbh 9 ulfmo3b 7j((,gbdo velocity in the +x axis. The position vj39hm,7(ugf bb bl od(ersus time graph of this object is

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zero acceleration in the +x axis. Them.pagqui*i : ekvh 9.* position versus time graph of this objecav ih .i9g*:.q*kepumt 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 (a:o xtl(k4nllg/z -i velocity in the +x axis. The velocity versus time graph of this object/ -ga(olltn4k(i z x:l 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 acceleration in qlvlt6 bz1)(u the +x axis. The velouz) 6l1t( vbqlcity 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 graph give,a ok8v(.qps os

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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+rs+ :hy 0ncjf+)ljiz 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 time graph givede;w 9+8mwf:ya- vk,fok(btn s

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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 gi p uy4;3rbgdd1 fv9bv3 ,-1ls7nuunf dves

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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 og4 * ts/oa,elsg px18uf an object is a horizontal line, the object isox ,1ls*peu 8t 4gg/as

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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 t tvra9bxv ybw9, ;8)uan object is a vertical line, the object isv bvtx9,wyu a9r t);8b

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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 o,oymn zrw:7u-hu,c7 x bject is a horizontal line, the object humn7yz u, x:w,ro-c7is

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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 afe1z4ck3d+j4kj9q+c*y w otq straight line making an angle of 30 degrees with the time axis, the objec t j1qjcfwke44 +9coyd+*kzq3 t 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 theye g;a1 enmwh1z t8k8g5*olbia ,m+/x distance traveled and h, 1*8 bgatlx +noyezie51;w/8 mkamgthe 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 -i1i,nx2j xpo water. How long will it take to move 12 km upstr- n2jp x,i1ixoeam 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/sjs1:va(z7 xa nof4 7bfiw4 ax3? (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 average speed in order to travel 350 km q5uet . iga-hsi9q m;u*yjf*;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 42h6pfke jp 1i+2.0 km) in 2 hours and 57 min. What is the averaj1fh epip6 k+2ge 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 t-llnw-r50 c3atdhz - kbcry80ravel 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 speed ol0rx )f6i k p:i +fyx1vxkpt60f light is 3.00 x 108 m/s. How many miles are there in a ly? (1 mi ff0xp)px6vt+kky 0r:l1 6iix = 1609 m, 1 yr = 365 d.)

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you are driving 72 km/h along a straight .etwa0idyl,5n- 5ax3q c ybr*road and you look to the side for 4.0 s, how far do you travel during this in 3 n5yd wyabqcl5.,*aex r0it-attentive 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), in 100q2o y:.44shjdcpr(f c s, your average verj f:4q (dp4coh. yc2slocity 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 ex07pwlg u ;g6Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km nou 7 60;exgwpglrth, then 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 travebp xl,k ep:uj49q u2-:ln8kugls 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 pug,4jke2qx uk8n-pl ul9: b: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 wedoyjx7n9zu 5qk8 n:az8 bn,,kekend from 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 yo, x 9nuzn8zd7y,8a q5:j nkobkur 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 atnorgoy.f g.)xi8r7: ;,kdgnp lb.e s( 100 km/h. What is the average speed of the motoristn(kdnr yb)xsg .o f;,rp geg7ol.8 i.: for this trip?

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What a ilb 3mu0y9*by8+dk3gx0 i fpis her average speed for the trm+ f 09py bu*ki3083ixyabgldip?

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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 250 mi/h f knt2n-ok)7y north for 750 miles. What is the average speed forfn- y)2on k7tk 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 h1t klea-pmy ;cq,x +0the last 100 m) for team A can run 100 m in 9.8 sex1m;ylhka+t,c-pq0 . 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 aftervci (6)/mdhqr; g htptx n.+q4 10 s. The car's average velocity during deceleration was 50 km/h. Wh tqn dh)cx;iv/gr6(m .tq4+h pat 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 itkn0cp6 h,b6cz3it2xk 8 5zsv ls speed from 100 m/s to 160 m/s, at the average rate of p6s 2b3l ,c0k6vzx czn5t8kih$15 \; m/s^2$. 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 aw6i0: gf8ta rit 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 resx lj i h;y/-.uymqy/*tt 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 mtknh 5*)jb; vgt/n4b a/s for 10 s. It then speeds up with a constant acceleration b;t4/ktv) g 5n*anb hjof $2.0 \; m/s^2$ 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 velocif(fsqch 0 ff2.ty of 5.0 m/s experiences a constant acceleration ofh. fs(cf0q2f 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 5m-biw00 uaj:fuc k,aghbci tk1 l+5,h8wk g.+00 m/s strikes a sandbag and penetrates a distance of 10.0 cm. What is the average acceleratioic +-g5k.ka tha hcm8u1+ful ,wgi0bkb j,w 0:n, in $m/s^2$, of the bullet?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A jet fighter plane is launched from a catapult on an aircraft carrier. It regm1q,ct,8ix4 b/sf k +ivh.qgb )pip)aches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is .8+1g/sbm)xqtpkg,pbq)f 4 cv,hi ii 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 accelerati.a9( vg)e,wmk+1zyzq hfc zva-wp bxj)0t,-l on 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. Wb7jf h9dw9i9y hat is its average acceleratiy7 9fw9jbid9h on?

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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 m3v 5gn:)+la ccckbl*. During the first second it travels 5.0 m. How far will it travel during the )+ccbml*c3vn ka 5:lgthird 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 lin2e x0;+o lsit: ,mb5rjn +skyze with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How fae0,i; ssbmjr:+2+xnzlk5tyo r 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 uniformly dc .jrr67iq-ysmd-b0w6 3 ricat $3.0 \; m/s^2$. 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 decelerate at abg0 t td; 21c)d9rkeugfout $5.0 \; m/s^2$ 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 liyw/ygbd4 y48u o0yl t8woff 1bn 9p.1pght turns green, a car that has been waiting at the intersection starts ahead wit fo84f8p/y tpgb.d0 oy4ww9 1ly1nbuyh 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 surface of planet X whjc0a;m j0(5o wj,owg here the acceleration due to ghm;0wjo ( ojgwa, c0j5ravity 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 54,oaceez,iqg4 h e*oy /7ixd speed of 12 m/s on the surface of planet X where the acceleration due to geo /i,da, z44ege xc7ohi*5yqravity 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 -xzl3s1a4 )c. t eyqgba speed of 15 m/s on the surface of planet X where the acceleratio4)b e.tzy- glaqc1xs3 n 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/7ss na;)t0wsf y9y v.cs on the surface of planet X where the acceleration due to gravity sc;anv9y.t)sy0 sf 7w is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Human reaction time is usually greater wihtc: + rb.0nt:x 5afthan 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before .bc aixt::f h tw0+rn5you 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. Whars/s( i+oz5k;aesnqmf,n 4n .t is its velocity after 3.00 s?i(+kfn a;r n/ .o4zs, 5smsqen

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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 poinoco9 - ruq;8xet in 10 s. What is the initial speed of the bulluroo;9eq 8 xc-et?

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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 pr u/ 9u4w7g qrcbj0k2m/s. How long does it take to return to its rbwu7q 2c9/uj4p kr0gstarting 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 thel f)zutm9flw4 v4d n44x6gkv 0 top of a building with an initial speed of 25 m/s. It strikes the ground aft4lff k9w4td4u)nxvzlg4 mv60 er 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.9 70arae oi(.izl:rj a (only fill in numerical value in the blanks) l(eora:0zi .7aja9ir
(a.) How long does it take the ball to reach the maximum height?    $s$
(b.) What is the maximum height reached by the ball?    $m$
(c.) What is its speed after 4.2 s?    $m/s$

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82#
 
填空题 ( 4.0 分) 切至整卷模式 搜藏此题  
  A foul ball is hit straight up into the air with a speed of 30.0 m/s. (only 5j a.pg6x3ha3pd9( p1snyg tv fill in numerical value in the b5g3y j 3p61dn9 ts aphpxvg(.alank)
(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?+sx /c- un1jiz


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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.chx7(5;z ; 8. dzgpgbe x+gcre5 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 velbtq 3k5mp3z fgtrk1 a34r vt4;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 veloci3 ekg3h1y5ktwty 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 veqd2u zqnj5+fl.lo0 x)*3qh sblocity 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 6.0;flm u8o/lh7),gb9idug 0wxd 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 t yc6zc s 7z pcjai-ml6,wx4*k8he 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 the accbtnst,9 pei bqyz+n d *e8(f4:eleration 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 th6lwv-/ jy/rpq e average acceleration from 0 to 5.0 s?


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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the average acceleration from 0 to 8.wusjvy+6,r0j8kip 1 e0 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 displac(h vtmq5f6 wnjc25p,ebau:q - ement from 0 to 8.0 s?


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