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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 anoth(iacn 30 k0u3 plfi/fner. Make a comparison between the displacement a (fk/pfncni0i303 ualnd 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 )fs ypt c )wh7-9e:udpwu6*au 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 16wu(f2/ xkb:l bv2b-edie aoadvertises that their car can go "from zero to sixty in 8 s". This is a descrip1x-6b (bwu 2iokefbv /lad2 :etion 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+ nud+p vsp74lces 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 travglr1o2ix jkyy 7rwf6 l:v07v4eling to the East (+x direction) begins to slow down as it approaches a trj7y4fr6:iy l goxrw70 vlk21vaffic 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 thema11onyhyy+wkd5fwi )p27s+ West (-x direction) begins to slow down as it approaches a traffic light. Make a statementp+ s 5fa+n 27)owwy1yimdk 1yh 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 velocith3g eim)xpy 8,y. Make a statement concerning its acce8g),3 pihemyxleration.

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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 acceleration is zee r9m5buk-l 5ero? Support your answer with an examplb9mrek 5 5-eule.

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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 const2eufc1v w0- wmant? Support you 0wvw 1um2f-cer 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 withizhyherq6e 4).pf0 0 /;, lxjtx9/x ihgn.jzz constant acceleration. Make a statement concerning itsj90 ih z,xh.. ngyxhtez;)/ px4 e0r zfq/lj6i 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 syqx9r dgjkf8qr*n9- c c6x1g1n-ctzin, /ol2peed while its acceleration is decreasing? Support your ann9y,qt/r96qkiggo 18 ndj -1 xfcn-xc *zr2clswer 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, mov4 u q(mymql3wy(w+f7nes up along a smooth hill of ice. Make a nqywwq (+m(4ylm 37ufstatement concerning 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 velocity equal to tb0xzl r);g/an he average of the object's initial and final v/l 0bx;z gn)arelocity?

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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 r2ulc orh8- g4c95fhh best. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the49cbhlc5oghu - rfh 82 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 te afwnuspa o n;lrx1;7tq i:zc. (a)68he same rate. However, object A accelerates for twice the time as object B. What is the distance traveled.1 sil :8a7;u;aa nwcprnqfezox6()t 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 releasee1 r g;v/f5siwd from rest and falls in the absence of friction, which of the following is true concerngfrse1 w v;i/5ing 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 friction, /q:lywg h22;6q1r*p gka -(; fk c)uabqwxrws which of tqp (yaucg6kqq srl-x)1 ;hw r/*;fb2ka:w w2 ghe 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. 7/l *d/rmm zfcMake a statement about the velocity and the acceleration when the ball reaches t7*/ /rlfmcdmzhe 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 upcba b,kuye 8 vq5p(15u. What is its acceleration just before it reaches q1( vp5ey5kc ubu8 ,abits highest 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 falls t3 jv2 ;lreqs rtdxt6-2z 5g jg/s/tfw,o its initial height. Make a statement about the direction of the velocity and acceleration as the ball is going uprze62v /t/;ts rqdtlw s2 x5-f,j j3gg.

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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, reach 9t:/fzi1oss;i9u kp ves a maximum height, then falls to its initial height. Make a statement about the direction of the velocity oi;i t/kvusspf9 9 :z1and 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 rer sz++ ,8ocq7ai aj2hesistance. Make a statement coce i2+rj8a +aqz s,h7oncerning 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(vg2up ofmnw) 0b)l)1z2tentzqc: i. from a high-flying plane. What is her acceleration when she sb)gicpenzqm nvlw 0( tto1)2.z f:u2)he 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 verticalll 3;b,hyk00 tyt8esx wy upward with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the3;yk0y0swleh xt8,bt 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, bdqgcoqn j( 5x ij(xg2o2lz-;,hb5s.e all B is dropped from the same building. As timhxbec,2ig g;jzjd s.q (o 52oq-x ln(5e 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 later, ball B -v,av x* 8+wy log-in:pta l/wis dropped from the same building. As time progresses, the differe+lxa8:,-pw olti- va nyw *g/vnce in their speeds

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two objects are thrown from the top of a tall building. One is tidlm)2s)l- e xhrown up, and the)m)2sx-d eli l other is thrown down, both with 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 brickyc f16eiwi87j/tqw z. is thrown straight down from the same building. They are released at the sc/ 6yw z7.feq1t iji8wame time. Neglect air resistance. Compare the accelerations of the two bricks.

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zero velocity in t;ut m; vqh-+pohe +x axis. The position versus time graph of ;q+oh u-vmp;t 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 conhq7y6v5y m8cttj 2 ;ah7 9)bd 0ibrucxstant non-zero acceleration in the +x axis. The position versus time gh u9 hjamdyc7v ty0 trbc286;57xb) iqraph 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 velocktku7x2ve1 5p 67 hlupity in the +x axis. The velocity versus time graph of thk l 7k1 pu627xupet5hvis 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 consak)(cxu*vb 2v pe.k *3sgo*fztant non-zero acceleration in the +x axis. The velocity versus time graph of this(c** gxv2b*ofkveuzp).ak s3 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 graae)i0l(z+ k l0m7:yky szy. gsph gives

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The slope of a velocity versus time nucy+o .. (ymygraph 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 accelerationwxk.0g4lefp2 l-w3mi 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 velocit5izhs etunchzk )j)dwr7a7/sj(-b,-y 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 gra d)5qx6 b9kl e((i /b.mmxine9f wfe(sph of an object is a horizontal line, the object 9i6f)q95xf( /n mbxeeksl.m i(d(wbeis

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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 a vertical line, the obp0b1bvy o-cd br(dd :)ject isd d)pbo:bvc by-(rd01

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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 horizonta. g(nmd m8m3dtl line, the object is3dm8t.m mn dg(

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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 straigh4t:;sehanfyag. 19 pb/ww u-zt line making an angle of 30 degrees with the time axis,.p:bf/s9u-;4 nztga waeh1w y 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,w.tyxw:c kl-c c65gwo:tp :f the distance traveled and the magnitude of t5 ttxgfw:pl -k::cw6,ocy cw.he 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 iqsp v0kt* 6;shn still water. How long will it take to move 12 km ups*vkt 0 qhss;6ptream 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 mi = 1609le-: vxkb9nrs,c5k,coizl my9wu*33 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 in 5.1a6qx- xbyp+ lj m71q-n5 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 k m.n5y 1ce;2joot,bxrm) in 2 hours and 57 min. What is the average speed of the runnejryo21b. 5emn;, o xtcr 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 fo q)izwd;td3 hq8iy2o)r it to travel 400 km?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ly (light year) is the distance tma6w l6 m6(ksmhat light travels in one year. The speed of light is 3.00 x 108 m/s. Holwm 6k6m6a(sm w many miles 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 km/h along a straight road and you look to thq/d8so* dxl4 ee side for 4.0 s, how far do you*q8/sd edxo4l 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), in 100 s ,ajixl le26s1nk o-9r, your average2s - lax 6i9lko,1jnre velocity is

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A polar bear starts at the North Pole. It tras z jkuun6j-14vels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to retus1 4n ujukjz-6rn to its starting point. This trip takes 45 min. What was the bear's average speed?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 z z2,j,alwdg:u8v nr)km east, then 1.0 km north, then 1.0 km west to retu :dzrvuw,2gnjlz,8a )rn 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 school2zaei: a lj3.5 68g s5brogk1ewnbd* a at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown d5l6jizg8 * eer2:kgbanb as5o13a. wfrom 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 ,e- ;rjrv:lxdat 100 km/h. What is the average speed of thej;-,:rldrx ve 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. c 9azqejydx66cy4 14j0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the triy dcjy6e1jcz94 4xa6qp?

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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 nortjicf(crfwe47s7aj+n4t*nr ( xj 0) dvh for 750 miles. What is fn7 0r+ewiv4 dj7x(scjjct rf(*na )4the average speed for the trip?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a 400-m relay race the anchorman (the person who runs tm+zgcae6w e5da o; 79jhe last 100 m) for team 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 rune6 aowze ;c5m7jd+g9aner 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 .4cw,8 j) dyexk lyts47+mwqra stop after 10 s. The car's average velocity during deceleration wa)c8,rqyjlt m.7 4ey xsww4+kds 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 sp0j2gen (pe+eo eed from 100 m/s to 160 m/s, at the average rate of e ego2j p+(0ne$15 \; m/s^2$. 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 lma u-p8/njk2rate 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 r9d 07 yaqrkes2b(z0xdfieev n 2b,(j4 est 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 foae) g3mayi gp6o;bt7/n( jrp2r 10 s. It then speeds up with a constant acceleration3 o)n pb / aga(ip6j;e7mrgyt2 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 ,/xjy+jz ft. yov 5;ddxt,q2 m5.0 m/s experiences a constant acceleration ofyd,zx2 t +m.5qdj x tj/o;v,yf $2.0 \; m/s^2$. 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 500j) ig lq k- nr:yz5jksgbb(*,( m/s strikes a sandbag and penetrates a distance of 10.0 cm5ib(ygkgq *()j, kn-r j bl:zs. 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 catapu 7s9ul6odg 7ialt on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and 69lugisoa 7d 7this 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 acceeayy ka0h9 e d8::d*4vj *mbhdleration 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.9u4:jbf/1sb : ibowi q,z4dmt What is its average acceleratq:4 :/obw dmusf,tbj1iz 94ibion?

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object starts frofawzmp:g lk kj4**sddn*3 p7 7m rest and undergoes uniform acceleration. During the first second it travels 5.0 m. How far will it lk3w*gadp7*z pm 7d 4jkns:f*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 iqjq1 jh7pl:q :t-pd d/n a straight line with constant acceleration. Initially it is traveling at hq- /j: :jd1tpqdlp7q16 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 ey: h7-t/k uqadl.6w nuniformly 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.z,64bpo t u;j pe:nhopl:2kj 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 at the i s(0:sg9h i/48r hc)8f/ :ug+jeoaw vqse brlrntersection starts ahead with a consta(q0ce:vf9r/ + u:8 rjb)rhh s is/eg g8l4oswant 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 wp;ds.e o1o e*(axos 1speed of 12 m/s on the surface of planet X where the acceleration due to x.s; seodw( a*oep11ogravity 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 of 12 m/s on the sf9/wvan0n:)dk 1o2jodd v o/rurface of planet X where the acceleratior9kad :)w /1/d vfv 02jdonnoon due to gravity is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 15 m/s on the surfb1kz ; ho 9czpa19 qv dpms4v/ys6*vx6ace of planet X where the acceleration due 9dm14zvsay ks9/vvpb;cp*1 oz6hq x6to 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 spe3g.6yqj6c* u4ua ck lned of 14 m/s on the surface of planet X where the accelerationncc3y.6 u4g6a kjq *lu 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 greater than 0.10 s. If your friend holkc2m5t:pnmz7 3+j ack bda7w3ds a ruler between your fingers and releases it without warning, how far can you expect the ruler to 77b:a35pwnmkz 3mad+kj c 2ctfall 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 velocity8bpx +)fsfzf3nmta,y g w sat.;6; :da of 19.6 m/s. What is its velocity after 3.0: b.+,; y 3pt as8)6tfgfa;wszmxdfa n0 s?

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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 10cl *k1u)nvlc vby80 .r s. What is the inill*vr.)kuy c8bv0c1 n tial speed of the bullet?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown straight up wi0- hbix9 bu+a6 tvo.z xss3ga8th a speed of 36.0 m/s. How long does it take to return to its ss+ih z3. 0b9a8bvgxu ox6st a-tarting 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 in z p*.x p/ybeu2v9d1lyitial speed of 25 m/ yp2 19uvl.*/z pxdeybs. It strikes 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 ljqvb5g5jm qn2 yxb0/c 9e4; bin numerical value in the blanksl55yjeq2b/0 b;vxmn j4g 9cbq)
(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 thzl ycf m1jnoskz.b57hi8k,a1,,3 ou fe air with a speed of 30.0 m/s. (only fill iz3u s, kfba5mo1, iof1,yhn z.l8c7kjn numerical 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 at5.a .s-ffqrui t = 1.0 s?


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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the veljpcme 4ryp2)2f+a lcpkpw 0.jql 586 mocity at 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 velocity at t = 4.e:q1 4*,wmg; ayz+xfrca3cn n0 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 l5yz otq:9then3)/8ux bq3mfvelocity 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 afnm*y94ab (k 7dmdk qm6,hv0average 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 velocimg :ve07rhof j3en9nop 64v4wty 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 7yw1yhog8 x x jv,,uxu5v, ya.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 accelerpbl *tl x sbo0vg8 udv,s:a+;+ation 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 avera * tloz3kdgfg29 n k3fvp6/4xbge 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 averu iz, cece828qyv;zp06gj(u uage acceleration from 0 to 8.0 s?


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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the displacement from 0 to 8q l5tj +)wq/fn /r7 u9,ypmagg.0 s?


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