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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 objetpsddh7 fh;-- ct travels from one point in space to another. Make a comparison between the d fd-dps-th7 ;hisplacement and the distance traveled.

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When is the average velocity of an object equal to the +xpw xl,2it 7pinstantaneous 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 "fromd djfb p9pg)i6xr./ k0 zero to sixty in 8 s". This is a descriptdib/kp)6pdr09jgf .xion 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 dm2vfye4 8 :pxb. cgvd;k6/ rhof $2.0 \; m/s^2$. This means the object is

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that a car traveling to the East (+x direction) begins to slow downov7 -3nn3 lohu1 fth5s as it approaches a traffic light. Make a s3fovt -l5hh 7on3u1nstatement 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 ju7 *.at3r vur/;yyba c-r bu,to slow down as it approaches a traffic light. Make a - jayc*. yu, 3v;rbuab r/tr7ustatement 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 coabbw t.w; 8v,4edn2xbnstant velocity. Make a statement concera v,bxbbn; e.t2 8d4wwning 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 iqs*-mlzq505zle,9izm q hd)is zero, does it mean that the acceleration is zero? Support your answer lziq*hsm5i05eqdzz) l,qm- 9with 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 acceleration is constant? a eve jmv:o+ 5f34l1vt Support your 53l ev t1:+j4mvoveaf 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 autqeu- yb/wok+ x -8u9 dyt(2h statement concerning its motion with respect y(o-/ u9 t8+2eky-hwu udqtxbto 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 acceleration is decreasing? Supq49ept a 2fkr3port your answer with an exeq kf2r49t3a pample.

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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 kicz27tfqu ),zzlk, moves up along a smooth hill of ice. Make a statemel ,z)2u zq7fztnt 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 tq +*dr wz2byl.he average of the object's initial rb+.y dl q2*zwand 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. f4uvk15s93utx rb2i k However, object A accelerates for twice the time as object B. What is the final stsfu 94xk 2r1ku3iv5bpeed 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 the sa/2vy;wc +/qquyz o6zcfr *lr.me rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to thatqyc ufqzc/lz+./yo rw*6 ;2 vr 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 of frictt1dhxb*;x 52juxu0 y qion, which of the following is true concerniqx2t*0u xy1h;dj x5bung 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 fal,. p)cfl 1nnp+c1vwo0p 7jrh )ejp g/kls in the absence of friction, which of the follogejp0n ).,p+pc 1n1rw vc/lp7hfjk)owing 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 aboutf j59qb b1y)rn8gunm p (3wl/u the velocity and the accelera rn jg/b5)9pm qbul8y1(fwu3ntion 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 justrzki ic y03/xo 0c kb(,tf; pvpe2+b)o before it reaches 2/c0ko vy xkizc (,ip+e)bp r0oft3b; 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 to iy 0x qlmj q +)0,,mm-tk.qpsk0j )dzmcwyoq 14tsq0, y1qm mp,ysq 0qkw4mjj-clo . m) dtkx+z)0 initial height. Make 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 hem5+*ke cm :dkkz2gw m7ight, then falls to its initial height. Make a 5kz kd+wemmc* 2m:k7gstatement about the direction of the velocity and 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 x 6;/y,e-s; 0d yf ryv zb6onbo2w6efjof air resistance. Make a statement concerning its accelrdbe6 6yjy z bs- /o0,o;f2 n6fex;wyveration.

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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 d fh*p72xa x tu6q;eug7taqf q2715 cha high-flying plane. What is her acceleration when she she rea7uh6f21t2 qfet* 7; xpuagc7h 5xqqdaches 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. 1mp7,f2 u e1nlhc bdstsp ,52 n-/b)ji4gcsyj An identical second ball is thrown upward with a speed 2v (tjbs2pj/ b gus5711-snlnp4 t f2cy)mcd, hi, ewice 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, ball B kmwq8:0 9bi zsis dropped from the same building. As time progresses, the distance betweqmb 9k0: z8siwen 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 buildsxz r f7m*7wzdulk u3*dh/ mmjtu3z.mh3; (/d ing. One second later, ball B is dropped from the sam /h(*umz jtzf7* lrw;dxu/7usmh . mdd 3k33zme building. As time progresses, the difference in their speeds

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two objects are thrown from the top of a tall buildinv h +czr;a 9igzcsw1w3s 0yu):g. One is thrown up, and the other is thrown down, both with the same ini;c3 wcs wgu:r)+yvaz1z9i 0shtial 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 b zymo0..42 pynd ;topfuilding. A second brick is thrown straight down from the same building. They are released at the same 4 .oop.ytfz ndp2m0y;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 9;c:bz6yl 9c64/ e up pqjscjhwith constant non-zero velocity in the +x axis. The positionpls :cbpz/eq9j 6uy ;49chj6c 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 wife vnderajod 7/; c;6)ft. v)wth constant non-zero acceleration in the +x axis. The position versus timev;t7w aro/.)n;d)fdfc e6ej v graph of this object is

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zero velocity in the +x axis. The velocit8k+ sre (w-kkcy versusw -ks8ke+(ck r 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 nojjkf/6du8t g 9 4s7s.on5pu kgn-zero acceleration in the +x axis. The velocity versus time graph of this 6 dk u7845sjogfskupj g9/. ntobject 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 gra(dqg-lt 573aljnorkvyp12r o19vr 2pd i., biph 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 grt awx;ur2fw2 b25.sr4jvdu: -vf9vmdxkq )y8 aph 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;zz4 /u7y0 0pdbt(si* eq hxmm in an acceleration 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 curv y4dgw ju+o, 5b5 g/ ovsbh4h0,gsi5rae in a velocity versus time graph gives

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the position versus time graph of an object is a horizontal l,ggru)c08oa4tp.8e10izkf)v vo x d tine, the object i tog)0vit84a0puckr8z . g1x,de vo)f s

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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 byifs p3((u*jof an object is a vertical line, the object isipbu (( 3yj*sf

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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 wr ty*fw1k*onjxqre3-ojz: m 3+j4j: time graph of an object is a horizontal line, the object i+ekjjywn3*m:3x:rz orj w41f t q-*o js

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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 i2;p0rhxa :8lu mpr,riq,b) wl s a straight line making an angle of 30 dphb0alw2: r ; pu)lr, m,riqx8egrees 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 south. Fww1huypg((p( ind both the distance traveled and the mag(yupg p(hw 1(wnitude 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 will it take tki.y dt1wfzg( :r00ta o move 12 km upstream in iz yg.f:a1r0wt (0tdka 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? hb;0 f)ja sdn6(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 )*rugbkm-( t 7 cuczch7g7 q*qtravel 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 (appro f6c,ozdetgka6 8,9xhximately 42.0 km) in 2 hours and 57 min. What is the average speedh ,c6faoetd96x gz ,k8 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 la )b t,frb/5olong 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 one year. The speed of nfzdf +i36vt m;pc.,alight is 3.00 x 108 m/s. How many miles are there in a ly? (1 mzm3f.p v;atcnd+,i 6f i = 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 side for f l-a.t(:ij(txtw8va 4.0 s, how far do you travel during this inattentive pea((i :v8fwl -ttj xat.riod?

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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 loowa9aa6avz)0)9qc w 6i (x38/oex+qkl zlur gzp around an outdoor track (400 m), in 100 s, your average velocitye) 9x9lwaic vlura+8)gwqzx kz aa6q(0z/3 6 o 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 1.0 km south, thevq1zqcq1u:gxd* ;q+hn n3da9 n 1.0 km east,q h9dngnq:q3*xcv dau;1q z1 + then 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 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 sou((pjuy7 f.9r8 fekr 5d,wm kpuar* e5bth, 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 bear's ave jy 5*u 5k7(d9bf uppf rwk.re8rmea,(rage 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 h3er w*e: (rqbschool 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 minu( e*hrebw 3rq:tes. 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 km at 100 km/h. What 6corsg y4 :edk6ufyyma9:38qis the averageam:u8 ecs y r96o:qykg43dy6 f speed of 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 zj;m;nahj 1 chcxls7/klk 478 at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the trxh/;7jllh kz; cc1as47k j8mn ip?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane travels q)i t6b 8anp;vqbcx4(at 300 mi/h south for 2.00 h and then at 250 mi/h north for ;n ci6x aq8(p4bvqb)t750 miles. 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 race the anchorman (the person who runs the last 100 m) 21 r;+umm3l blvi73dhyif k:nfor 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 runner starts the final leg of the race, in order that the team A runner not lose thnmy3:v ;3k1hbflu mi ril d+72e 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/,o* 2i.hf4vwaxrc8bu3v lsz's average ve.o3hb*2u,xzril/v 4vfw s 8ac locity during deceleration 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 speed from 100 m/s to 160 m/s, at the average rate o *3kbgs ll:lkac2c a+1f 1l :l23akkclags c+ *b$15 \; m/s^2$. 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 of -fntx)5i dh r,$2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cart starts from rest and iz2s7izhl)- s 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 speed h+lnu2mj/ach/i2 kp.s up with a constant acceleration o p2u+2cknjmh. l h//aif $2.0 \; m/s^2$ 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 5l,fgos(1 w tf,llc;+ciy0hm- .0 m/s experiences a constant acceleration oft-+( ,,lo l1 yfsgif hc0lm;cw $2.0 \; m/s^2$. 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 (+x8+r/5sij eb sft;mn ,g6wwq,r direction) with a speed of 500 m/s strikes bm,treg,wwj s qn+;f5s ri/86a 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. Itsbqh97uf0u6tj-v . uqk2dg35fw lldgq i/z ;6 reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the accelerationu w.z0g6fbf qqq gh69d uutll;/v j53d7s i-2k 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 consz.lmi ( i-5(fu: czmbvtant acceleration of $2.0 \; m/s^2$ for 10 s, then travels with constant speed for another 10 s, and then finally slows to a stop with constant acceleration of
-$2.0 \; m/s^2$. How far does it travel?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car goes from 40 m/s to 31wibl j5 es17i3ehkv 80 m/s in a distance of 200 m. What is its average acceler kl j7v1e3i5 si31bwehation?

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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 ans58,/w1l ry qc+i48mgmuvnggd undergoes uniform acceleration. During the first second it t uv54mi+rwg1 n,yl q8g/sgc8mravels 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 acx8*xyzzsmt,6 pc rl3 -pe. gc8celeration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10gpt6e- zs8y3.c 8xxrlzm pc, * 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 uniform *9mrpl*91cre7pi vjlsg +y+fly 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 drlv68-ogao q3voh5rux; ap/0gu-;w moy 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 h( 2 hwdq0b:w0bxvkn(las been waiting at the intersection starts ahead with a constax(kbl :d vwwbnh20q0 (nt 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 withcveoe 9 54fo7 xbef+x.e.4boz a speed of 12 m/s on the surface of planet X where the9xvbf.oe57+bc4ox ef.e 4e oz acceleration due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upwark3.,sjj ypme- d with a speed of 12 m/s on the surface of planet X where tjmk3 .j-,yse phe 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 upward with a speed of 15 gbeki +dr6c:./l+p hsh8w +kjm/s on the surface of planet X where lr:bjghch pw86 e s.+k/+dik+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 upward with a speed of 14 m/s on the surface of planvd vck u*r 64cs,a4mv)et X where the accelera da)kum44r c6 v*vvc,stion 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 iv bxy9+z 7j2f e3hef9ns usually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the re9f 2bhjz e+v3 xnf7y9uler 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 velocio*1 jxxe txq70ceic-0 ty of 19.6 m/s. What is its velocity after 3.00 s?iqt j71o x0c*0ex-cxe

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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 startin t:e 1w:7xnazng point in 10 s. What is the initial speed of znnw 17:eatx: 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 speed of 36.0 m/s.l1rwnxnn9w 6 3 How long does it take to return to3 9l6nwxw1nnr 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 fr2w8r3t s8ln8)m ,fxstn orua) om the top of a building with an initial speed of 25 m/s. It strikes the ground afte o8tlrtf3s an28wm)8nu s ,)xrr 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 inlyh14uog bc o:/gzgd 3 ne168k7b7gvs numerical value in the blan/khd bcs4gvgglo1g8ob3nu yze177 :6ks)
(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 wi saptb02)d/wp s4h - a6ouu5zfth a speed of 30.0 m/s. (only fill i2uupaa0zp h f bow/64ds )5t-sn 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 at t = 1.0 s?s,w k 8 u0;yvyydf4j*,ypy 8yg


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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 velocij u qb*;k11xua-tj,q:o3 n:w1a kwktx ty 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 ei wgw c8c,;(i= 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(a, itubo)yt0 ty 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 from0 /f8lrret u8u*ln1gj 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 rmasv;.6/6 ;p) o2azx msvwudto 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 acceleration atwetwu.g:(4vli :v+re,rbfqa 1 eh;:v 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 accele pt/qhs5adz8:0:nyhjration at 3.0 s?


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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the average acceleration from 0 to 5.0 s?.eyxebv .. lz(


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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 2s x,w pl n6ane66w/g8 vsd8zbfrom 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 8gg4-6tobz ixy1p .8+ edxkkzdisplacement from 0 to 8.0 s?


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