Suppose that an object travels frek9ti*wwaw6vq t6-e 4 om one point in space to another. Make a comparison between the dist4kiv*eweq w6 tw6a-9 placement and the distance traveled.

  When is the average velocity of an object equal to the insaexn u/62jf,n9v kes )tantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero /:bc flpl xavgg,5h.6de 7c w5lut* w,to sixty in 8 s". This* l.5,5ug a/tldl:cw6w g h,xv7bcep f is a description of

  An object moving in the +x axis experiences an acceleration ofyu, c q1z9nkc( $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x8 ht-9tbrb5bf pyz dna34b 7y 2uu9jf6 direction) begins to slow down as it approaches a traffic light. Make a statement concerning its ac3rbb5 ay-nfh 7942b9d jzy8tuup tf 6bceleration.

  Suppose that a car traveling to the West (-x direction) begins to s/crpn5fdn4xa : b8s*wlow down as it approaches a traffic light. Make a4 f8p*:n b/ascw5ndxr statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. f*np)f q:5g-1 d iwkwf Make a statement concerning iifw5-qnw1f gkd*):p fts acceleration.

  If the velocity of an object is zero, does it mean that the acceleration x7ps0pbym((i +n j 9atis zero? Supporm+ i79(ban0pyjtx s p(t your answer with an example.

  Can an object's velocity:vf* wm hzl86c change direction when its acceleration is constant? Support :6zhml*fc 8vw your answer with an example.

  Suppose that an object is moving wit:(jq mm mhn*j 0pkc9 7iwg+(qyh constant acceleration. Make a statement concerning its motion with resp+mkcq(j:9(qgpynw* h j70im mect to time.

  Can an object have increasing speed while its acceleration is decreaue kj3km*jm;:wr(t jfkn7:e6 zo 0r p-sing? Support your answer with an examj:j wum:r;76 (tnjekf- 3rk0pm koez*ple.

  Suppose a can, after an initial kick, moves up along a sm5 y+. k bkb0xid-fhrq;cs03a booth hill of ice. Make a statehqad ib03b;kf05bxskc+ -yr .ment concerning its acceleration.

  Under what condition is average vsehq;,dd ql ilx p*rm0)/3ej4elocity equal to the average of the object's initial and finalx;4mj/pr03qd*dlhe s) ,q i el velocity?

  Objects A and B both start at rest. They both accelerate at the same rate. How(p4h5.5gp4 gngxkmen++cet e ever, object A accelerates for twice the time as object B. What is the final speed of object A compared to tp4(h5e.kgm xng+npg54ce+ethat of object B?

  Objects A and B both start from rest. They both accelerate at twch6 ik+.l6xthe same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of objk xl.ihc+tw 66ect B?

  When an object is released from rest iek:;s7i3 rvh0 vlbtt4i)f 1c and falls in the absence of friction, which of the following is true concerning itstt fi1i;:3 4bclkvi7h0esvr ) motion?

  When an object is released from rest and +hi9 orm 30rg10acslrg zpc)8falls in the absence of friction, which of the folzrga8 o)0s+lr0mi3g rc1hp c9lowing is true concerning its motion?

  Suppose a ball is thrown str;dpfg b01jr g.:, mtxkaight up. Make a statement about the velocity and the acceleration when the ball reaches the highest . r0pb gfmkxt1;gd :,jpoint.

  Suppose a ball is thrown straight up. What is ivazg)13s k bsm1vm*k0 ts acceleration just before it reaches its highest p 31b0m*mg1zv sk)k vsaoint?

  Suppose a ball is thrown straight up, reaches a maxs lz5.; kjj/6e qupzy*imum height, then falls to its initial height. Make a statement about the directjzl; /y * p5sq.ej6zukion of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to its initia.pz3upd-duut k (:z/ wl height. Make a statement about the direction of the velocity and acceleration au.utz :(ud/p 3zkwdp- s the ball is coming down.

  Suppose a ball is throj q8vr)-vrqco/jj/ (w kms.ok4 a :x4y1gyc i/wn downward in the absence of air resistance. Make a statement /v yjsc. /mxkj/ry( :o)ijrcvg -q4 81akq4owconcerning its acceleration.

  Suppose a skydiver jumps from a high-flyrc rc 0v);:adping plane. What is her acceleration when she she reaches termina )car :0;rcpvdl velocity?

  A ball is thrown vertically tqu :garp/8)uupward with a speed v. An identical second ball is thrown upwutqparu:g )/8ard 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 the second ball go than the first ball?)

  Ball A is dropped from the top of a building.+tbc 47 la7dkl One second later, ball B is dropped from the same building. As time progresses, the distan 4a 77lkcb+tldce between them

  Ball A is dropped from the top of a building. One second later, ball B is dro:l-6., 0ng twhdjb7oschg 4cppped from the sa ,js lc4t:g7cgn0 6 ph.oh-dwbme building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown up, andeuhj:q/l q6l 7l(p)xeeb;yh7 the other is thrown down, both with theylj :7 l epe(e h;q/76uq)hlbx same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second+nntu(ywie ) 7 brick is thrown straight down from the same building. The+)nw (iye7t nuy are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. 43 fdr6 + mt39an2 iipniqtfy5cd.oy:The position versus time graph of this object infi: tad.m i t f239d 3yr6y+ocnqp54is

  An object is moving with constant non-zero accga2m.l9 0efvu l7zs1feleration in the +x axis. The posi2l7m1.gff 0l a9e zvustion versus time graph of this object is

  An object is moving with constant non-zero v:8 ;z ,e;f-c edksyf yljj(9lmelocity in the +x axis. The velocity versus time graph cml-:sef9k jjy (; l8z,f;edy of this object is

  An object is moving juig *hgwf 40:j 7*1ndnhs -lewith constant non-zero acceleration in the +x axis. The velocity versus time graph *sjgunwf nd:-h0i 7he1l g4j *of this object is

  The slope of a position versus time graph g l8nbj71c7tyu ives

  The slope of a velocity versus time graph givoje s n:o4*v(des

  The area under a curve in an acceleration vegm, c a,os8ke 45-o* -kkueeebrsus time graph gives

  The area under a curve in (w)l4 ulz8(ngt *9zxs6ccycsluk.q 9 a velocity versus time graph gives

  If the position versus time graph of an objeb*fhocwpzxpw4c ah*w), 6 78bct is a horizontal line, the object i wp6oph) *w8bbcx4 fwhc*az ,7s

  If the position versus g+9*ucvj .qf ptime graph of an object is a vertical line, the object iscf. juqp*+g 9v

  If the velocity versus time graph of an object is a horizontal li /b jljo:1vs6t.o-g-7lg fzbmne, the object g6:mo z7l-fsg bjb v.l1j /to-is

  If the velocity versus time graph) 7kn9.k cynfj of an object is a straight line making an angle of 30 degrees n7kckj) yfn9.with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distance tr5zjlc), ev6fesy4f l, aveled and the mv4ye5cfs e,zfl j,)6l agnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to levwz )z5bg)yi*h, )kk*tak u nz0o43 move 12 km upstream in a river flo g khl0*)5ykkozt ,4b*w 3)nvzzea)i uwing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi h5uno) 4bg9y1kv+ktfx ,nyz)= 1609 m)

  What must be your average speed in order to dz/ tp8jfnu-.travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km)*mw3l/ s0rb.mglep2 c in 2 hours and 57 min. What is the average speed of the runcms0lbr/ m2 pg3e.w* lner in m/s?

  A car travels 90 km/h. How long dw2;12 q vim( pxbg+cnc zp)1yfoes it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one yuj8oqf(7l :ug blt8w 8ear. The speed of liwq8 8ojl u8f:gutl7(bght is $3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

  If you are driving 72 km/h along a straight road and you looku7vb+.aetms mo sp*o.5n o+m8 to the side for 4.0 s, how far do you travel during this inattentive peevm7 oa 8optm.+*sm.5o snb +uriod?

  If you run a complete loop around an outdoor track (400 m), in 100 s,*q86irym cuo6 your average velocity is*uy c q6o6rmi8

  A polar bear starts at the North Pole. It travels 1.0 km southofhqj (xdhu,xkxr 3 r4 v0b615, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to itsvxq x 4ko,05(3 udrh61 hrfxjb starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels,;sgl; le-z mb/l,cad cm,qp3 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 bear's average 3; ,gcl pm,, bdl m-/l;saceqzvelocity?

  You are driving home on a weekend from school at 55 mi/h for 110 milesdzfnw2bwb m /s0(q,3tk4qsatmx-o5 .. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes t z5ws (n/.k smdo,3-w0bqftxbqm2a4. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. W4q- :6dq/ liziwkquf2ha+rf, hat is the average speed of the m-qu+laqkizqr2d/ hif6 wf4:,otorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her a*c9-uie.t +td c:ij f,b:9az*oy b* bxott;v lverage speed for the tripbbzi-:t o*e ;vctft.x:ybdito 9,c9**a+ u l j?

  An airplane travels at 300 mi:v2 fk ;5durcq/h south for 2.00 h and then at 250 mi/h north for 750 miles. Wu:kc2v qd; fr5hat is the average speed for the trip?

  In a 400-m relay race the anchorm)h3qt9 qzn zklk9nlrh2q d,ak/8c4g/ an (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 the team A runner starts the final leg of the race, in order that the team A runner not lose az9 8h9qhk 2, kqt)c zlnglq3nd//4krthe race?

  A car decelerates uniformly and comes to a sto )n 4px4;iwinpp after 8 s. The car's average velocity during deceleration was ;wi4p4) ninp x45 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average rajuonf99 yfbv6p.w;pled * g1o 34; oqwte of bwnqouplpy vd*; ; 9f. 9g1fwo 43oej6$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rj34ul- lt:,wgylze7 i 9g xh /cte3fb:ate of $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and accelerat yr u:i u66m9jwqt*:b 6*vsglpn6ve a+es 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?

  A car travels at 15 m/s for 10 s. It then speeds up with a constant acceld ;6t.mkmo lru,8vylpz+ zf)kl0 c4 +weration)6l;8zwofz l,rl +kkmmty40cp+d .v u of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 2.4 m/s experiences a consta 03;iqazk1za1n-huhd nt acceleration of3u adh11-hkqinz 0 za; $1.6 \; m/s^2$. What is the cart's displacement during the first 5.4 s of its motion?

  A bullet moving horizontally to the right (+x direyv)yaco;m rtea2i)3 w1 b :d9oction) with a speed of 370 m/s strikes a sandbag and penetrates a distance of 97.75 cm. What is the v ew1ma:;i9act3rb )oy) 2dyo average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an af i 58+g5+h fsv0ppx3doivr9gircraft 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 constant, what is the length of t dffvg hp+x+5 iv53p0iro9s8g he catapult?

  A car starting from rest moves with const2q6iyp5ta j0d ant 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?

  A car goes from 40 m/s to 80 m/s int,kgx ;l4or(-in)gu v a distance of 200 m. What is its average accele tu(io-4g kg)xr,vl n;ration?

  An object starts from rest and undergoes uniform accelera7dgbkb:6r. zyh0ga6f tion. During the first second it travels 6.8 m. How far will it travel durf6z7brdy: 6b.kgahg 0ing the third second?

  An object is moving in a straight line with constant acceleration. Init 12a-rxvhiizkf +466i t;)k 6sqwl fvlum:er+ially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How fa ielk -)kzvw66x:;tf6i4r1qiruh+2 ls+ amfvr does it move during this time?

  A car starts from rest and accelerates uniform(-al4gwqizmn8 ax /)p*zi7wnly 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?

  A car with good tires on a dry road can dec4k( d47uae.bpef8vq u 7dzqiu1tb.b+elerate 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?    $s$ (only input numerical values)
(b.) What is the stopping distance?    $m$ ((only input numerical values)

  At the instant a traffick vs xcjl5c/ rpq m3vl4**1wr1 light turns green, a car that has been waiting at the intersection starts ahs 5kx41j l*rvv13cm w/*cqp lread with a constant acceleration of $2.00 \; m/s^2$. At that moment a truck traveling with a constant velocity of 15.0 m/s overtakes and passes the car.
(a.) Calculate the time necessary for the car to reach the truck.    $s$ (only fill in numerical values)
(b.) Calculate the distance beyond the traffic light that the car will pass the truck.    $m$ (only fill in numerical values)
(c.) Determine the speed of the car when it passes the truck.    $m/s$ (only fill in numerical values)

  An object is thrown upward with a speed of 12 m/s on the surface of planw/m tbghgln( .z(:yi0h,wm k6 36rh tyet X whereln .bk3r z6t:myh hwimt (w0(6g g,/hy the acceleration due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed of 12 m/s on the surface of planewbse lu 8.ina*y5i 56ft X where the ac5l nbius5w*i.f e86yaceleration due to gravity is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upward with a speev7ga ) v;x+hm)gvnbp5 bx,g. ad of 15 m/s on the surface of planet X where the acce np5gv7)gv,b;+ghaa vx) .bmxleration due to gravity is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

  An object is thrown um3u a7 7to aih03e0f tu:g9dotpward with a speed of 14 m/s on the surface of planet X where the acceleration due t t7 a 0t3tmuoi97dea0:gu3hof o gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than 0.10 s. If your friend hz gyja:u ym 27h85ici1olds a ruler between your fingers z7jyg1h5iya 2cm8u : iand releases it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a vpm3fw8ex hwx -:a6m b+elocity of 19.6 m/s. What is its velocity after 3.00 wwe6m: pa8+ -mhx b3xfs?

  A bullet shot straight up returns to its starting point in zx (; (nn0bf/o+bk-u6egx uvev5cg6h7 4okqw19 s. What is the initial spke nv(og h/ouev7n z0qf -xb+4(5c6wbgk6;xu eed of the bullet?

  A ball is thrown strapdjkj wd7ad6x r -h7(3ight up with a speed of 36.0 m/s. How long does it take to return a-pdjr k 3(7w6 d7jxdhto its starting point?

  A ball is thrown downward from the top of a building witijrf 2r)lx ,r0h an initial speed of 7 m/s. It strikes x,frr ljri2)0the ground after 6.6 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numericabzy.xe81np 5( f,pmfp l value in the blanpbz(5fy 1,8n mf.p xepks)
(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?    $m/s$

  A foul ball is hit straight up iny- xwof8e;1muto the air with a speed of 40.5 m/s. (use $g=10 \; m/s^2$, only fill in numerical value in the blank)
(a.) Calculate the time required for the ball to rise to its maximum height.  (数值)  $s$
(b.) Calculate the time for the ball to fall back to the height at which it was hit.  (数值)  $s$
(c.) Calculate the maximum height reached by the ball.  (数值)  $m$
(d.) Calculate the ball's speed 2 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 6 m above the point of contact between the bat and ball for the first time.  (数值)  $s$
(f.) Determine the time at which the ball pass a point 6.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1ripljpallk8 7idd b9ro 17w .)ojs k69 a.v8i2.0 s?

  In Fig. below, what is the velocity at7zt2 (dia :0paj let(o t = 2.5 s?

  In Fig. below, what is theqoy 64hsv0qy1,t/yxbw9o: kwodj 1 u1 velocity at t = 4.0 s?

  In Fig. below, what is the velocity at t = 5gnatsecn5 )5q2 8tuz2.5 s?

  In Fig. below, what is the average velocity from 0 to 4.2)ll if/sh- uj8 fstc:0 s?

  In Fig. below, what is the average velocitef (k3hh 27h,gk (zl ucbzoa57y from 0 to 6.0 s?

  In Fig. below, what is yun ue-*t(e7 r gnh3;qzv*bt:the acceleration at 1.0 s?

  In Fig. below, what +o 5 z/ibk9/mml:iq)dosqhwg pu5 h62is the acceleration at 3.0 s?

  In Fig. below, what is the xq- xkwb*kjc48 .5e.no(ffyp:he kp+average acceleration from 0 to 5.0 s?

  In Fig. below, what is the aver5jugv l9phw9h;d/) ryk8ez ( den1jl ,7co y2kage acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8.+5fc1k j9ksh5r nn .ncmzp*h s pw.1 h;8pbdx/0 s?

Does a car speedometer measure speed, ve5oot i59wjkk:n.ri -w locity? {speed|velocity}

  An object can have a varying speed if its velocity*cbne95nj8 qfz 27ofj is constant.

  The velocity of an objecttc;ytswm+ b(9rcrhg0s 0:)e*h h z:tt f2aj*i can be negative when its acceleration is positive.

  If one object has a greater speed than a second object, the first must hkh23apdeae*z:n9b :dm 40w ziave a great nkie *bzd :3m4z09aape h2w:der acceleration.

  Two cars emerge side by side from a s) /7 io:ps l(sbnpdl -psq1ayga.y)0tunnel. Car A is traveling with a speed of $60 \; km/h$ and has an acceleration of $40 \; km/h/min$ Car B has a speed of $40 \; km/h$ and has an acceleration of $60 \; km/h/min$ . Can A will pass car B at the instant they come out of the tunnel.

  An object can be increasing in speed as its acceleration d4hri2 uc6f6mtn .w;yf ecreases.

  A baseball player hits a foul ball stn/l lir*)3asvuxhlgf+ ,e5e .raight up into the air. It leaves the bat with a sp) 3h afu+rnl/e.exv s*l5gi,l eed of $120 \; km/h$. In the absence of air resistance, how fast will the ball be traveling when the catcher catches it?    $km/h$ (please only fill in numerical value in the blank)

  As a freely falling ; xk awdt9 xd46(jli; (uff0gro((lqdobject speeds up, what is happening to its acceleration, how dowfkxo(( 9d (ra t(ui6 jx;g4;f0dqdlles it change if air friction is ignored?

  As a freely falling object speedm*b6h 20;w snwk o7jxks up, what is happening to its acceleration, how does it change if air fr7;bjkwkw x 2nmo*s6 h0iction CAN NOT be ignored?

  An object that is thrown verticalf+) e al zv 7/bndv9m7w-pml/ dzxh4v7ly upward will return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, howv7dlnf/h/m vvzmzdw7b-p 49 ax )+l7e will this result be altered?

  An object can have zero v;0lb1,e hzo3 pozdwq-elocity and nonzero acceleration at the same time.

  An object can have nonzergs)(q6h e pc5do velocity and zero acceleration at the same time.

  An elevator moving from thtu;use ck48 ijh: (oljy.al *6e second floor to the fifth floor making no stops along the way has zero acceleration al:i.h ;jkc es(tlauj yul6*8 o4l the time.

  A rolling ball moves from7mv ox* tk1 /e6 axyifpq2y5+s $x_1=2.5 \mathrm{~cm}$ to $x_2=-4.5 \mathrm{~cm}$ during the time from $t_1=1.4 \mathrm{~s}$ to $t_2=5.5 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.2 \mathrm{~s}$ is at $x_1=2.8 \mathrm{~cm}$ and at $t_2=3.4 \mathrm{~s}$ is at $x_2=7.5 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-m;v/r. . y50emi ad:i z8lgwpay;giml 3ile ($1 \; mile = 1609 \; m$) track in a total time of 10.6 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trainer in a straighrtpl-1n,i m7b:hl yv xn4ty8 :t line, moving 98 m away in 12.3 s. It then turns abruptly and gallops halfway back in 4.8 s. Calculy t hi:4tx8l p :nl-vr,7bm1ynate (a) its average speed  (数值)  $m/s$ and (b) its average velocity  (数值)  $m/s$ for the entire trip, using “away from the trainer” as the positive direction.

  A car accelerates from z( :zma2yyey1m; :*0gbaqeti $12 \; m/s$ to $23 \; m/s$ in 5.0 s. What was its acceleration?  (数值)  $m/s^2$ How far did it travel in this time?  (数值)  $m$ Assume constant acceleration.

  A car slows down fromm6wv* 3j/ayy (vbut(x $16 \; m/s$ to rest in a distance of 71 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must rearev).vh7f z +:41 p o6ulwvxrach a speed of $33 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.4 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to f-a o f(-5pg tivos(1lessentially top speed about 5a1-(iop- tgfsv lof($11.5 \; m/s$ in the first 14.6 m of the race. What is the average acceleration of this sprinter?  (数值)  $m/s^2$ and how long does it take her to reach that speed?  (数值)  $s$

  A car slows down unifoo q/o6,emdfx( esgj(0) hke v3rmly from a speed of $20 \; m/s$ to rest in 5.85 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves sks.t:xr . og 8bz-pf*pmid marks 92 m long on the highway. Assuming a d -:b8o xpg*..tm szrpfeceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck.jm /tj pn;)kv going $25 \; m/s$ on the highway. The car’s driver looks for an opportunity to pass, guessing that his car can accelerate at $1.0 \; m/s^2$. He gauges that he has to cover the 20-m length of the truck, plus 10 m clear room at the rear of the truck and 10 m more at the front of it. In the oncoming lane, he sees a car approaching, probably also traveling at $25 \; m/s$. What is the closest distance of the approaching car that he can still sately make the attempt to pass the truck? (without hitting the approaching car).    $m$

  A runner hopes to complete the 10,000-m run in less than 30.0 min. After exactjbk (si-l 9-pnly 27.0 min, there are still 1100 m to go. The runner must then acceleratb9ijn(pk -s- le at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$