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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 y0 n im-q(a5)ft i01tbx xr+p(yvwr1zspace to another. Make a comparison between the displacement and the distance travev wq(i)pf0b-mnrya i r+(tz1yx501x tled.

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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 eouwp) .jsdw z/q)h8, rqual 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 thai ) q6jw8hudokw i:2a5t their car can go "from zero to sixty in 8 s". This is a deo5ha)k6wqu8 i :wd2jiscription 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 experiences an acceleration of d lmi8*qy i:c oz-gc96$2.0 \; m/s^2$. 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)ip4ehs2siw0n id8 3t6 x+phf* begins to slow down as it approsn3eh 6*pfwi2xpi0 4 s8ht+id aches a traffic 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 West (-x direction) begins to sloq dig46f )zpvjw55zy*w down as it approaches a traffic light. Make a statemen iy4 d pg)vqzwz5j6f*5t 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 vemfq)f2z lwp+tx2 sg.9 locity. Make a statement conce9)wg +2tq.pm fzxs f2lrning its acceleration.

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity of an object is )c, 0uh2pr)uw4e3lo nvvb(xsc 5 djk7 zero, does it mean that the acceleration is zero? Support your answer wit03hk rj, wc4c)(epvodul7n5s2bv ux)h 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 direction when its accelervizuogw708;bslg* v )ation is constant? Support glvwi bu)0g sv*o;87zyour 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 statemenh t6g/on x6m1u)je y8wt e6mj wh uxo/n 1t8yg6)concerning its 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 whildij *suu vgk1;j**lu6 e its acceleration is decreasing? Support your answer with a;1g* 6uvludku j*is j*n 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 lth/+ cg k0andzb p600initial kick, moves up along a smooth hill of ice. Make a shn0lk td/a0pg zcb+0 6tatement 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 veloci+zn8- ovra+fojt t) 7sty equal to the average of the object's initialrf+)v+tnos - 8jz7 ato and 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 accelerate at the same rate. 8qs07 sployc;However, object A accelerates for twice the time as object B. What is the final speed of object A compared to thatq 0 ;syocspl87 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 yex z+ m*aji6qhuq1.(from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as objectm6zh j(a eq.y q*1ix+u B. What is 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 in the absence uxcgf2 y )wvb5bv *p8o(don+2of friction, which of the following is true concerning its +*8 n5do y( pvvub co2x2)wgfbmotion?

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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 fro-. rq4t mha(j5b pqkt8m rest and falls in the absence of friction, which of the fhq4t b-r j5p8mk( atq.ollowing 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 velocity abojoia/-jd r9:p+owul3 o/a 4nd the acceleration when the baa d9o3j/4b :o+ar/o ju- piwloll 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.*/ 2piq l6d)kc8i kj htue(sw its acceleration just before it reacsilt . q/)8ujw6d ekick*(2 hphes its 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 tof 9su5ztotqmth d+g6u: 6;u,x its initial height. Mau dz:x69+fmuhou 5;tt6q, gtske a statement about the direction 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 height, the8lo l 7ccrwhlguo2utg ( 2:rortv g67m5c2e/: n falls to its initial height. Make a statement about the direction of the velocity and acceleration as the balltlhv72rr2o /ec7g2glu:gu t clo8wr om6c5(: 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;xdob )un;a +bhjahdw:9u5vh4egv 58 resistance. Make a statement concerning its a;ogauuwv hjb:8bv5 )d+ xdh h9en5a;4cceleration.

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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 froup /6z9b2sgl ri .ycb4m a high-flying plane. What is her acceleration when she she reaches termiygr p2zcs u9lb i4/6.bnal 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 uplsp5 bhv:06h6gv3 3f.krdu usward with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does tu5udhrls0:kv b3fp. sh66 gv3 he 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 thee*cgfuf /l;*ll-ims a97wbwi7w l4b,61 k xbl top of a building. One second later, ball B is dropped from the same building.le*l-ilx 74sglbbma ;c, iw9/1 w*u fk6w f7bl 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.t11gt-b)zp qin4j2oz v 6b7 iu One second later, ball B is dropped from the same building. As time progresses, the difference in thtnutiiz7bpvg6 1ojzq - 24)b1eir 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 thrown up, an*/pps.fusq wa v6.dw6d-xt) yd t*xq.w wpds)6/dt-6.vsf y apuhe 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 brick is thrown st-i.)-dt fsgx qraight down from the same building. They are released at the same time. Neglect air red .qf-xi stg-)sistance. 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 thui5xl-vz zvnw6l1 b1 7o whv+1e +x axis. The position vl+1bvw 1w 6z xohlvn1i-zu75 versus 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 jqb8 +y5d n:mww: 1re(iw z lya5uw,y;non-zero acceleration in the +x axis. The position versus time grapi,y58+r1:y (wbywwwmul qd ze;:5najh 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-zdh5h,ienx 2lar0is0nh x715lero velocity in the +x axis. The velocity verh ei1l5hx0i nr7hd a2l 05,nsxsus 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 acceleration ify x d6o/z r9gz.oy03ln the +x axis. The velocity versus time graph of this objd 3/6z.l x froyyog09zect 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 vers,z)c/i -:z3cozz guck yhr l53us 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 velocity versus time graph x6 kpu +s 0x+:t+zzdmzgives

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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 tzds g g6n ) aw:nigqqbsk*)*v3/vu;0eime 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 versusu zp/ea+nk7 q3e;q 4p4dq2hdj 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 a horizontal linf64mpfb stcnbo b45x*kn 0) 7le, the object is 6pcnb*nb5l40bfs) 4 tx7mfko

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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 v fft9 k+yil+j8h9 yk4jertical line, the object isky l9y+4 9hi+jf 8ktfj

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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 hord/s(clxu)n- 0se .n kpizontal line, the object s.(uxn) c0ks/ pnl-de is

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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 line maki76 qdb1j n ,uy9,oyfdlng an angle of 30 degrees with the time axis, the objecn, j6f9dy,oy 7buqd1l 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. 3mtqy.w 5c7n yjk:av-9x o1qi Find both the distance traveled and the magnitudm3 wyqy.n-vc9o qt7 :jka51ixe 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 waterjq4e+:(idt-z + ug t1sssu)op. How long will it take to move 12 km upstream in a river flowiseuo dt-s j1u4 ) g:q+zst(i+png 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 mi2u :9sii 1l+asf 6qsjj = 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 or59 v*m s;t guh5xv,dqcder 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 and 57 min9/ -eb/( k6esp tx hvvrax-;as. What is tt- / e6 be s;/xa(sxhvrp-vak9he average speed of the runner in m/s?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car travels 90 km/8y3m.gckxl8d h. How long does it take for 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 that light travels in oehqazovmun)5 v 1jq:7q: *ua 8ne year. The speed of light is 3.00 x qvmu):qvn zoq 7jh a1:a5u8 e*108 m/s. How 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 the si,8k-hb.8jyq2e lp-b(bfsy qr de for 4.0 s, how far do you f8yb rb.ekp2(q- y qb8,j shl-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 - -rpoizlx/ 4kcjrux66dd 7(h around an outdoor track (400 m), in 100 s, your average velocrlri6d jxhx d/uk p--7co6 z(4ity 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 travels m li5;., 8 fm8o*ewqiyvooq *x1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its start8qq*, oxmmfwivol 5.8 i*yoe;ing 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 k(2a+8ih ziph North Pole. It travels 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 the (zah2iik8 +phbear's average velocity?

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are driving home on a weekend from school at 55 mi/h for 110 miles0e tc,b zgj67x. It then starts to snow and you slow to 35 mi/h. You arrive h0e, gcb76jx ztome after driving 4 hours and 15 minutes. How far is your hometown from school?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A motorist travels 160 km at 80 km/h and 160 ys9 r uw7.phq-39 r+uipzem r(km at 100 km/h. What is the average speed of(ep+9wrm suu9.zr qr7pyh3 -i the motorist for this trip?

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 kme6n5oe,3v, r jwk, wya/h. What is her average speed w vwe3kj no e,,,6a5ryfor 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/houi)o+c k9s,xh+b-uq3snf , s south for 2.00 h and then at 250 mi/h north for 750 mixhso-+3f kb)+s,oqi s,u n cu9les. What is 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 racz fj*+zwckg 0 -c;v1cqe the anchorman (the person who runs the last 100 m) for team A can run 100 m in 9.8z+gcjw-zq *vc1 f; 0kc 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 after 10 s. The car's ave fgrqthvz. )43rage velocity during decelerattz 3f.h4)gr qvion was 50 km/h. What was the car's deceleration while slowing down?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane increases its :3m t8bt mr-qcspeed from 100 m/s to 160 m/s, at the average rate of r:mt tmq8cb3-$15 \; m/s^2$. 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 oxfar aj7-n5l-;pxov/f $2.0 \; m/s^2$. 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 fdcvk9d+wpub x( 5qp8w*+lihc38n,6elq*y iand 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/ 00)vzkoh89/ qjfpsods for 10 s. It then speeds up with a constant acceleration of s0o 0do)q fzvj8h/k p9$2.0 \; m/s^2$ 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 1x,cjg(wu)evo.w6m hacceleration ovu1jwe )6w (. gco,mhxf $2.0 \; m/s^2$. 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 t /qggox5c 9)fyhe right (+x direction) with a speed of 500 m/s strikes a san gc5f/gxyq9 o)dbag 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 l0n;bvk0 vw nbwi/9rk4aunched from 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 consta b9k/i4v0n0bvr wwn ;knt, 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 acceleracg l6bav.hw3 qict d35cntiw+.;05b ktion of $2.0 \; m/s^2$ for 10 s, then travels with constant speed for another 10 s, and then finally slows to a stop with constant acceleration of
-$2.0 \; m/s^2$. How far does it travel?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car goes from 40 m/s to 80 m/s in a distance of 200 m. What is its average hp *l3+7s+k( 4idinbywkz s6 dacceih4z sn 6++(3yl dk b*kidw7spleration?

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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 unde1edqk ;xt7;nargoes uniform acceleration. During the first second it travel ;7t1nex;da kqs 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 ef(5mo+cka,+( a 1bx e6w 4aqij uf9hgwith constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time o5m4a wef (b9(c6hf1e +ixg,aj+qauk?

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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 accelera 6f )vocbczk: 2m0vj9htes uniformly 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 road can decelerate7wd,bm2 9 d icmfjw8a9 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 wai6c en j)w-nev5ting at the intersection starts ahead with a constant acen-6vn5e w )jcceleration 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 surfac e3 at41du;im2u8s ayke of planet X where the acceleration due u4td1328u aseakmy; ito 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 wit hg0:c9, yfg bvzlqv10h a speed of 12 m/s on the surface of planet X where the gy9f 01cbzh gl0q:vv,acceleration 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 upwa zi *91apuvp,r uqw.j5rd with a speed of 15 m/s on the surface of planet X where the acceleration due to griwpaqu 9u1jprzv5 .*, avity 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 the surqpb hl4vtqn5 2o(e,4b face of planet X where the acceleration dq,bq b vn(hoetp4 5l42ue 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 f;i ne*n;mogo:v c)jcnp)qk08 pv-2 tpriend holds a ruler between your fingers and releases it without warning, how far canpto)2c 8po: )im gek;v nqn* vc-pnj;0 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 iu:4(pq ab e8l+-vu tpms its velocity after 3e b-(vl+quapu8 4mp t:.00 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 10 s. What dl)m1s go /- 1ehipzx8is the initd)x ip- eo/1s zl1h8mgial 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 with a spe5gx x au37.w tge3(p (vu)qgfped of 36.0 m/s. How long does it take to rtu ap(.3fg x7)(w3ge vxqpg5ueturn 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 buia:u,0o:*l u k3bf v5riaq ryh:lding with an initial speed of 25 m/s. It strikes the ground after 2.0 s.oi30v:: :ualfy ha*rub,5 krq 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 wit.xqvn g*j zisnw;b-/,h a speed of 30 m/s. (only fill in numerical value in the blanks)b*sinx;g- v.nq j,wz/
(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 speedhq4 ur.4 :e8rct:/j nox *m x+5tawuek of 30.0 m/s. (only fill in numerical value in thxr 4cat5/nw.ox84 k jquh:m +e:teru* e 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 v(o/0+vu qsh nvelocity at 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 velocity at t = 2.5gn-: +dcs a/nw 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 = 4.7.b;nep (62zpawajzf4 c- hi p0 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 ko,amw)xljva 0ob:-: = 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 ther bes;)l,) bulf*se2a average 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 velocityot z;lnz/xlkz0g / 91o 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 accelerati f9c2cq912etv s qff -kn4l)epon 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 acceleratioq9xb gca;;,p xormi5cg0+ 8wtn 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 zo6bn9j6r j+-dtaec.celeration 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 av8. 1s9p,rs tz eyyec(terage 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 fro09i5 ))m,efcszspzw(cs / rdcm 0 to 8.0 s?


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