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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 from one point in sp-4 jzq;z/ bmog-hqxt2 ace to another. Make a comparison between the displacement anz q2bx/-- 4gz;jmhqotd 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 vi+aru;6jn)oz4 +ue h xelocity of an object equal to the instantaneous velocity?

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A new car manufacturer advertises t5o:cm )im )lbhhat their car can go "from zero to sixty in 8 s". 5)ob:h m ci)lmThis is a description 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 experins,m20. af 2oceh *e9weua r+iences an acceleration of $2.0 \; m/s^2$. This means the object is

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that a car traveling to th xfnxj mi lm69:j)jrh. i mrkbo3*:-:ue East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concernin6xumjx3b:hm:mi) ljjir 9 -*no:r . fkg 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 slow doqju9.g(oc/ +vi f6ul pwn as it appr/ v.6q(u 9uip+lcgf ojoaches a traffic light. Make a statement concerning its acceleration.

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that an object is moving with a constant velocity. Make a sv9v zg02 tw wifb-10yatatement concerning its acci9tw-2a1vvf gby0zw0eleration.

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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 acceleratio ix*-kbny/9ei n is zero? Support your answer with an exb *ix yek-in9/ample.

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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 deudcw 5h4+.b 3/cmuywirection when its acceleration is constant? Support your answer with an exa w+y3u4wc/ .bhmd eu5cmple.

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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 movingr,sep b9z sxv 7(ar5v6 with constant acceleration. Make a statement concerning its motion with respect to t 9rv srbsv56e( ,apzx7ime.

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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 acceleratiog.;4;m -8ckvcgj gvdtn is decreasing? Support your answer with an example.v4c.gk;gmc dgtj- 8v ;

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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 along3p)l,y b js 2a*jgz i.fqg4i t)nlk+j9 a smooth hill of ice. Make a statement concerning its accel j bi9aj3g+t j zf2lpg y4.kils*q)n,)eration.

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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 xoq8jh 1tov f0 3lra+99,ui4:kmze x othe object's initi9oax h1ljo+rzk4 v9 8 oumx0f:t q,3eial 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. cib gwbrj c:9.hg:,zfwiwdn*a3 ,2-rThey both accelerate at the same rate. However, object A accelerates for twice the time as object B. What i.c9,bz:3 ifbig g wd r,w2h:*jrncw -as the 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 the same+jz)b t6w dxw z* vzjs7q3;ty- rate. However, object A accelerates for twice the time as object B. What is the distance traveled by ob*jv6t b+w ;wzjd3)szxz q-t7yject 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 8v05qj4jkgpi ju o:+d the absence of friction, which of the fkpuo i0gj 48 5dj+jqv:ollowing is true concerning its motion?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When an object is release :lw m0m42qgjd: pqib+ y2k:ltd from rest and falls in the absence of friction, which of the following is true :g2 qtw db+2:lmmyj4 k0i:p qlconcerning 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 nbl+ pss+-yn5(h dhs7 crh,)eabout the velocity and theehyh( s-5dp hbncrs+n+ s,)7l 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 ithc t4wcq :6dn 1k s1kg8),aefis acceleration just before it reaches its highnecfh )dk1c14 skw 8 ag:,6iqtest 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 h50yc.abhi7ai9 rj9 vw eight, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is y .hi5aj9iw0r7vc9b agoing 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, reach x9,emazh xqm(wm03):sss 9ab es a maximum height, then falls to its initial height. Make a statement about the direction of the velocity ah9xms s),a: x9mwqe(sb0 az3 mnd 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 thrp 5i )rgsf)-lu lq;l3kown downward in the absence of air resistance. Make a statement concerning its acceleratiof;pl))s3gl 5ir klq- un.

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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 hixkulyrsh2 -./l0fq* w gh-flying plane. What is her acceleration when she sh2r s* yhu-kxl./0w lfqe 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 speed8iyy0tn x z 5zn6-e/ +hi+equw 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 doe6i0e+z nx8zwi-5 nh/y+quyt es 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 se7 eba ykmy+v8je cbmpk ;;3vx-:uz9a.cond later, ball B is dropped from the same building. As time proay cmp-v:z38evx kjbkyam b+97u. e;;gresses, 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 lattb bg;n og(q*w4c+qn ffb 0h4*er, ball B is dropped from the same building. As time progresses, the difference in ttnggfc*q 4bo bb; w4(0*nq f+hheir 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 thr r/c3h :uu.eubown up, and the other is thrown down, both with the same initial speed. What are their speeu:uc. b/hu 3erds 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 t5 gai) *rlhwt:he top of a building. A second brick is thrown straight down from the s5 :hwla*gt r)iame 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 witnl +cl idt/0p4h constant non-zero velocity in the +x axis. The position versus time gp0c i4l/l+ ntdraph 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 inztq; (qnm)yvh 8 cd:v: the +x axis. The position versus time graph of this objecc:yh mvqnz q t)8dv:(;t 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 velou85 ww da879v0fkzqwkcity in the +x axis. The velocity versus time graph of this object isd8w8zu w 5qkw9ka f0v7

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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.o-sdx3(iwc bha+j d, in the +x axis. The velocisco w3a ,hb +-.jixd(dty 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*hp7tuy,wqx5 by/ ;z gd g/m(as

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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 lrjr6 wm,,d py ) z(ltccsc2ko)09ls3time 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 acceler7q) od6 ufjc3bation 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 curinnp 8 ;4uu9dy vg,g-mve 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 line,fh6 yzta,n) (d lj*sral, vl1uw6 p2o5 the object z(t2 n) 6wjul1hd6a5s af,ovrl,l*ypis

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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, theru4yy4 bue sstm8x;j*m9y3 *b object is4j rsxu4eb3;ty *y m8u9bms*y

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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 horizo/1t jrt/(q js7zr:q(h* kd pfzntal line, the object r1(:dt j *t7qkp /zrsj/ (fqzhis

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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 makinf p)e2 hztag72 hli g;v4; jhrhi,mv8,g an angle of 30 degr pg,jgz, i ;f4h2v 8hm)27e halhvti;rees 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 nk;4we .lu:kqeorth and then 11.0 m south. Find both the distance traveled and the magnitude ofewk qeu. 4:kl; 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 w3pnm;8 0-2ng ourp gpdater. How long will it take to move 12 km upstream in a river fgodgrm n32n0u ;ppp-8lowing 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/sowsf65wis44zv pg x+9? (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 spi 1s(g xhrpm )3-d+lxteed in order to travel 350 km in 5.15 h?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A runner ran the marathon (app)8,m v3dabi5-p +don (/l(o bg ppopllroximately 42.0 km) in 2 hours and 57 min. What i/ -b p id po(dlm3p5lvopo8b +)ln(ag,s the 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/h. How lohdikx:/ (fz , aukb;miq( ,i*qi1a 3axlc;)bdng 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 d ks31bq5b*bk qgdm)p0 istance that light travels in one year. The speed of light is 3.00 x 108 m/s. How many miles are th*sb b5p0 31gkdb )qmqkere 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 sidejw,78hf wkc e/ for 4.0 s, how far do you travel during this inattewj78 hcfwke/,ntive 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 track0yjw7g1 nbm eb /)/m4du, glfr (400 m), in 100 s, your average u7)yjgdbn e /,bgwf mr/m104 lvelocity 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 travela 5gi6gkm6amma+pj f/- 4b,xbe3ks-d2li+z l s 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return tema 3kx4g gi25ifz+-6pkl,mba dba 6 +/m jl-so 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 Pph,1bb9a al8l-2cla ts a6ikl,6 vww(ole. It travels 1.0 km south, then 1.0 km east, then62wapwlv (k6lbh ab -c,lla,8s1ti a9 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average velocity?

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are driving home on a weekend from school at 55 afop,.nu56if:4 uflh i2cd7r 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 youruur6ih, i. ff4p on:52c7dafl 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 aa/xq6,ap ac/ht 100 km/h. What is the average speed of the motorist a6acxap,//q hfor 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 ko:kk sz6hv,)lm/h and 2.0 h at 100 km/h. What is her average speed for k) s:k hol6,zvthe 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/h south for 2.00 h ane 0tgtx odh m*h7pe;w7 t)2bam(p y8)wd then at 250 mi/h north for 750 miles. What is the average speed f hm )dme *7op )0tet(g8th2by;wp7wax or 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 ( o fkse66diaph8(d0p8 d wk0y,vqv j-;the person who runs the 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 tkf w(d,08p;8ejks0 iv-o 6dypqvdh6ahe 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 dqezpyf1cyeyt e u )7;ht9*++rage velophey+u9 f t1cd;e zyqy+ 7*et)city 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 1iq; * ayw./dvi00 m/s to 160 m/s, at the average rate of qdva*i /w;i y.$15 \; m/s^2$. 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 g 5b- lwca1tsqi6a/x/c aq ma79:pa k6$2.0 \; m/s^2$. 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 ansoozpki,v.q m 7d5 )(wd 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 speeds ukjt)xp)v i1o f (59v/yolvt)up with a constant acceleration of fv ytvojki(t )ux)v9olp/1 )5$2.0 \; m/s^2$ 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 experiencesd7 7wgxjtn y16 a constant acceleration owd 1gny76x7jtf $2.0 \; m/s^2$. 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 spez0hf;se 4p3s ved of 500 m/s strikes a sandbag and penetrates a distancees4 ;v0 hzsf3p 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 co/uxb0pz*oo n4jibszm i, o407q f-rsoy9 4y+arrier. It reaches a speed of 42 m/s at the end of the catapult, and thn p7x+qi00yo4you /z4r*zoi,9 jbs sombfo4-is 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 mov;kt8 ))nj+3v0ccbelib m o2x mes with constant 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 80 m/s in a t -z.xvn/ 8zpzdistance of 200 m. What is its average acce8.zv-/znxz ptleration?

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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. Duriw9 s)mvvyeor p407gm8 ng the first second iyg8 s p9m)wvr740moev t travels 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 straigk.p8c s/q hjr)ht line with constant acceleration. Initially it is traveling at 16 m/s. Threerq8.k/jspch ) 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 accelel8v6je a*rwebo jn.ox 8zc( 1pxu6+(trbbv 2 +rates 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-*- cv)yvw eky a dry 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 ha*cu wsz9afg /kxd3;sxn5qc )6s been waiting at the intersection starts ahead with a c3*6z xsw/g kxn5d c qcfus);a9onstant 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 t7n()rr/3bnsjwumv e2- l5yu x he surface of planet X where the acceleration deubrvsnw( l-3nmy / 7 2x)rju5ue 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 upward with a speed of 12 m/s on the surface of planet 7nvvhzi4*lfs2f gm 2 :X where the acceleration due to graviths 2lvm g:vf4n i*zf27y 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 surface of 7v keru 8lvlv;x.1yldphkq+s: 46 bh6planet X where the acceleration due toev+1 rbk74;ll vd 8 usk qhvx66:l.yhp 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 sby oyits,10*g/ irdj2urface of planet X where the acceleration d2t /bsrd j*ioyi10y g,ue to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Human reaction time is usually grs eev,0kys 9v 0:(baroeater than 0.10 s. If your friend holds a ruler between your fingers and releases it withouya00:ev(9,osb sv ekr t warning, how far can you expect the ruler to fall before you catch it?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown upward at a5*wvsl4 bge/ aky n07j velocity of 19.6 m/s. What is its velocity after 3. 5*kla0ygv7sben4 j/w 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 is the2z;ee z8(h ngfzfq 0:a initial0q8a z2z efgzfe;n:h( 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 speed of 36.0 m/s. How l6s2xaw9 e77aaqbko 3s d6ze 5cegzt6:ong does it take to return to its starting poicea26t7d7 a wo366 s5geb 9zkza :sxqent?

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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 wfz;*a, zl, waoith an initial speed of 25 m/s. It strikes the ground after 2.0 s. How high wl,a*z z af,o;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 straighxr ia(8;).efmnv,bb d t up with a speed of 30 m/s. (only fill in numerical value in thb8. mx)bf;(a,n ivdre e blanks)
(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 spe 6y+au i; mi0n-p2hcebzxs9k,ed of 30.0 m/s. (only fill inp-m akbh nu2y+ i6sec;,i09zx 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 veloi ,un;tzhyl) f(alt,) city 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 = 2.5 spvmjd x /b*p6x5uu:0f ?


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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 pj6u nsrlh:* 56olhx6= 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 velocity at --x5wz x6vs wvt = 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 a6bzs4egh:o. /rdo 74v mfz2zyverage 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 aver, n4sr: y 7 o2u8hzykrr(duu1jage velocity from 0 to 6.0 s?


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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the (zzx8f1u+v 2d atf/b uacceleration 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 accelerat;0xo1 9 91o ls1u.qg js*whpcdrfor9 sx:(tzxion 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 ao (9dwd0rqcm(umwd3f5 7o 1gfverage 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 8.0r ;/6on cj+jid 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 displacvu,c4 j5fqy 9tgir9x2ement from 0 to 8.0 s?


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