Suppose that an objecw;m03 kalp) cpt travels from one point in space to another. Make a comparison between thm;)lkwc 30app e displacement and the distance traveled.

  When is the average velocity of an object equal to the instant vynx*omt chrclity90y /0 +67aneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty iv8 z9* jcc2t)ywid a1sn 8 s". Tdczwatj9csv 8iy 21 *)his is a description of

  An object moving in the +x axis expw lz-lh((j1s0xi x rn d0c2ug6eriences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to thc2zb w+s7 q69giim s.oe East (+x direction) begins to slow down as it approaches a traffic light. Make a statembscz692i.w i7o +gqms ent concerning its acceleration.

  Suppose that a car traveling to theme p,(,evbv aksp3 f43 West (-x direction) begins to slow down as it approaches a traffic light. Make apevkbe 3, fv4(s3mp ,a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Makex:q3wk5 )gs9* clgxvk a statement concerning its acq 5x) kgv:3kl9g*wcsx celeration.

  If the velocity of an object is ze5ynad;vli-0nslh v3x 4xsn/ /p 7wg v,ro, does it mean that the acceleration is zero? Support your answer wix g/ lydlxna 3vi; 7n/n5 4-svsp,w0vhth an example.

  Can an object's velocity change direction when its acceleratio91tw :xngq3a oq7k kh-n is constant? Support your answer9xga w 3to:k1k-qq7 nh with an example.

  Suppose that an object is moving with constant accelera t4i.l7 ebw.umtion. Make a statement concerning its motion with respect to til..4bwmt7i ue me.

  Can an object have increasing spehjm(p:ysno:w*) jjn-b4t k tsi2 q5 q-ed while its acceleration is decreasing? Support your answer wiw mhpo)-:s5j-4ti t k*nsb: j(yjqq2nth an example.

  Suppose a can, after an initial kiz,4 jfo+aca yr3xqol2 (/z5rvck, moves up along a smooth hill of ice. Make a statement concerning its acceler/o (, cl4j+ora3vrxfqzz5ya 2ation.

  Under what condition is average velocity equal to the average of the obje8txb,kg z/qmn4 8a 2qnct's initial and 4tb2k8mnnx aq/g8zq, final velocity?

  Objects A and B both startk4,w,*f89p u6 akuogjmjxer 2 at rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. Whatwj9urekuomga4xfp8j, * 6, k 2 is the final speed of object A compared to that of object B?

  Objects A and B both start from c; .y6p)hknxrd 1g;qorest. They both accelerate at the same rate. However, object A accelerates for t;n)o. ;cdyxr6kp 1qhgwice the time as object B. What is the distance traveled by object A compared to that of object B?

  When an object is released from rest and falls in the absence of friction, whizslqh.gkoqr6c/: 6n mhr,q.+ch of the following is true concerni/zr6nc ,6m g rq s+hqhkqo.l.:ng its motion?

  When an object is re 3(nci;jzbr .xi .jv1hleased from rest and falls in the absence of friction, which of rj3bj.cnz;1x. vi i (hthe following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the ves t .-/asotnxgdy; tt)lwa,5, locity and the acceleration when the ballnxd ; g/5).s,asto- yta t,tlw reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just before it rux -zr,s5fe;teaches its highest p-ux;sz, e 5tfroint?

  Suppose a ball is thrown straight up, reaches a maximsfrn 06z h 8zbxtw87qe ),eq b+klp5/oum height, then falls to its initial height. Make a statement about the direction of wbn s57b8k ) ez+0l8,q fq/6rxotzpehthe velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then fa4n(b.d.ye 1svitf vt .lls to its initial height. Make a statement about the direction of the velocity and acceleration as thne. 1id.. vsfytv4bt (e ball is coming down.

  Suppose a ball is thrown downward in the absence of air resisvhtj3c id+*+ yt2va; pdr d52fn. /muvtance. Make a statement concerning h d25. tucfd+n ;midyt*/+aprv23j vvits acceleration.

  Suppose a skydiver jumps froqus1i86p8epvr c; -tfr p2-f qm a high-flying plane. What is her acceleration when she she reaches ter8f-e; rp6u-pq8tsfp2vci1q rminal velocity?

  A ball is thrown vertic.giwe8 wy pfz8/rw5i;ally upward 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 fiw8wr;gip zf/5i . 8eywrst ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a6jx8d+aw 1dh6jun zw; building. One second later, ball B is dropped from the wx+1d ;j6ja hw8u dnz6same building. As time progresses, the distance between them

  Ball A is dropped from thepr:w q1d76a nlmx 7i)t top of a building. One second later, ball B is dropped from the same build q tp: m1l7w7dniax)6ring. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall.bf77x 5zrceg building. One is thrown up, and the other x7gf7 rc5 b.ezis thrown down, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is th*inmii5n w7 zm*2+n,smcggz 2,uq iv.rown straight down from the same building. They are released at the samm igz i2mi2v+wc . n*q,mn7 ,5gi*nsuze time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in bnyy+ cp1o0r+ the +x axis. The position versuspcbory0n+1 y+ time graph of this object is

  An object is moving with constant non-zero acceleration in the +x axib s6okymh/1t2yn d, m;atr-b5s. The position versus time graph of this objeb/ tra5mk mydtybons12h6 ;-,ct is

  An object is moving with constant non-zero ve/ab a1i9cl.7 p,izunrlocity in the +x axis. The velocity versus/,.ubar 7i9plnzc ai1 time graph of this object is

  An object is moving with constant non-zero ace4mzy ttmt2+) (h z- 8(uohcduceleration in the +x axis. The velocit(t+(o tmtz e-4c2yh)hz8u u mdy versus time graph of this object is

  The slope of a positi/: sz0psjl4/ vq vh5d 09jpmqzon versus time graph gives

  The slope of a velocityug;:rnox8nu;2apohjt a ( w -0 versus time graph gives

  The area under a curve in an acceleration versus time graph give*o lf*om -o t7b+sahd9s

  The area under a curve in a velocity versus time graph gives7gdko bp1fbdeo-w b+*hwc 0;-

  If the position versus time5l0r-grv9jv n graph of an object is a horizontal line, the object i l-r 5v9v0nrgjs

  If the position versus time graph of anu.k mcu*4(fxo object is a vertical line, the object ism .(uk4ufxoc *

  If the velocity versus time graph of an object is a horizontal line, the ol v/ c ilj+,xev625vzmbject ivl l+6jez52vciv , mx/s

  If the velocity versus time graph of an object is a stra v8x y4jkigsr)d 0venhi021r; ight line making an angle of 30 degrees with the time axis, the o41y8rkvii;2g0x r jne d0 h)vsbject is

  An object moves 15.0 m **jnpz* o0qjhky s71 li3j: pl,uy5m mnorth and then 11.0 m south. Find both the distance traveled and the magnitudp7k3pnjj*zj,0 s1mq lh: yu y* o*5lmie of the displacement vector.

  A boat can move at 30 km/h in still water. How long wi)8-iy u0pff6ugac 9n buhc f/,ll it take to move 12 km upstream in a river flowini fhfu-,) 69p0u8gyccunabf/g 6.0 km/h?

  55 mi/h is how many m/s? davp:j.ps i :)(1 mi = 1609 m)

  What must be your averb/w/moz az 73bg6l,wvage speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 h6lodxac2 /z 8e3+5sh oj0jsec ours and 57 min. What is the average speed of the runner in m/od6 es8/o0sj2 haex3+cjz lc 5s?

  A car travels 90 km/h. How long does it tap zwbluj (0-t9ke for it to travel 400 km?

  A ly (light year) is the distance that light travels in one yehe2a3b gk6 e-2rpszmj r,s*.tar. The speed of light ip s-eb,s3 rrj6e.hm2z gkt *2as $3.00 \times 10^8 \; m/s$. 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 straigxbv90j2hc g7hht road and you look to the side for 4.0 s, how fagc0 v jhx927bhr do you travel during this inattentive period?

  If you run a complete loop around ,ii;u9 vwsph n-c, /rsan outdoor track (400 m), in 100 s, your averag;p- 9,srinshc i/wuv ,e velocity is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km eas *zln4 p7zyml;t, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45z74m;zyp lnl* min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 9g b(oqz 8**tsmn3 f4 vwf,nzlmyn6x5km east, then 1.0 km north, then 1.0 km west to return to its smy n6,8znoz 9m*fg sxb4(5v w3 nf*lqttarting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles. Ityb2d, gvj uk4)ea*kd(klc 0p; then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from scho(d0lbae2kkkj4 cp d ,;*g)vuyol?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. Wfefd e;twt543rn,+h jhat is the average spe+e3 t n4fwdhjf ;5,reted of the motorist for this trip?

  A motorist travels for nh9ei) rle pm39c f*; wh.l/q5yu9jka3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the / ;ny 39he5lra fwc9lkiu*jmp.eh)q9trip?

  An airplane travels at 300 mi/h south 3h37;qqfq vsdjn4 fcoo*6j d*for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for the tri o;dj4*o*sq33qdj7fnvc6 fhq p?

  In a 400-m relay race the anchorman (the 78 7 4)kqiuncsl1jk poperson who runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for team B, ca 7qo7k4n 8ps)l1ukijcn 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?

  A car decelerates univx2 o73r)s 1z hbn/lquformly and comes to a stop after 11 s. The car's average velocity during deceleration was 51 km/h. What was the car's deceleration whiler hv so 27/x3bzl)1uqn slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average rate o5+;uk*dndzb0s ,ar h4mu-esl+am v* m f zmsma*+h+a,*es-4vl 5 br dundk0; mu $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acceleratese6dt m60nppt:u1u6x h at the rate 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 accelmt w8( nmdd7os-.v*7/iy psleerates 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 mm9clkhd p f) ;e1p*lr4o 1,krw/s for 10 s. It then speeds up with a constant acceleratiolr d p*11er cp;ofk 4),lh9kmwn 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 1.5.drf k *2bmbz9/rji0g m/s experiences a constant acceleration of zfk brr2dim/b g*j0.9 $2.4 \; m/s^2$. What is the cart's displacement during the first 8.7 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed *q;hta, j;pw uof 334 m/s strikes a sandbag and penetrates a distance of 58.00 cm. What is the avea*;tjuh ;,wqprage acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched fmdm,e( x1zcrwbgb,.8r 0/ nvrrom a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requbv.m 0rc 8n(1,z/,w x rrgdbmeires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves wjiwg6xri cw*p9,l s(. ith 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?

  A car goes from 40 m/s to 80 m/s in a distancelgq +izt-/3s0v 5vrlhg1 :*o ;slgk(0vclgoh of 200 m. What is its average accelerationzksslgg3 ;1 giv g:(l 0v-/lochl +ot50r*hvq?

  An object starts from rest and undt* *a5ey+ vq4gt-c u7rkkd; ohergoes uniform acceleration. During the first second it travels 8.6 m. How far r htka*-;7ue *vcq 4kdy+ogt5 will it travel during the third second?

  An object is moving in a set ;mn5/5a+9troo o kktraight line with 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 a95tn oko5em t /;+orktime?

  A car starts from rest anq k mm fqat:pei-e +.2+bciut0 z;gf/6d accelerates 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?

  A car with good tires on a dry road can decelsfwv76 4b v7twerate 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 traffic light turns greepzr,jr *:ii- 0o tft+.)d-xyxhxu 8pen, a car that has been waiting at the intersection starts ahead wipd, io.0*xr)x yr:iftu jz peh tx+-8-th 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 129 z:k. t+w4qek4 oeahbb1o0eti --qb d m/s on the surface of planet X where the acceleration due to gr eb+z - qw-th9kkb1. 0dtioe4:qe o4abavity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward wircofkq8 ec6ww p0(25 vth a speed of 12 m/s on the surface of planet X where the acceleration due to rcq evwc2 kf58 o(6wp0gravity 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 speed of 15 m/1 (n*d:jzvzrq6w: v rg h2zu/1cpej0 ds on the surface of planet X where the accelerati:w evc0vn62(z g: dhq/rj1p1zdzurj* on 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 ups::9f.i peot(qe ebqn5slzhy:x 1+c 5j )*maxward with a speed of 14 m/s on the surface of planet X where the acceleration due to gravity is tsee5p.so:liyq:5xe 9bxjh)q c1 zn:fm(a+ *$3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater t(p :nyds+e 3awq8fbvn(0 2n dc2c xh/ohan 0.10 s. If your friend holds a ruler between your fingerd2+o((cdc:wph8qv2 fxn 0 yn /an3bess and releases it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6*ntz/v;ic +k x m/s. What is its velocity after 3.*+z;tnk icxv/00 s?

  A bullet shot straight up returns to its starting pointme*ez* h2ywe*suw(u , in 15 s. What is the initial*2 yes mzehue(,wwu ** speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it take tckv ch64l6 a2lbgr8 .zo return to its starting point6l vc8bh .l kazc4r6g2?

  A ball is thrown downward froggl w;uo3(k afyx:sf*g 5:7f wm the top of a building with an initial speed of 15 m/s. It strik*k(s ;75wg3:fyu gwffg:o ax les the ground after 2.1 s. How high is the building?

  A ball is thrown straight up xiaig.. x6ej6with a speed of 30 m/s. (only fill in numerical vala6.gxix.je6 iue in the 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?    $m/s$

  A foul ball is hit straight up into ei t4fs+m (b nwv3hqpe013 j5ej( wi4bthe air with a speed of 44.3 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 5 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 5.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at4m 6bpg q;:miudck:iji.4v -e t = 1.0 s?

  In Fig. below, what is the velocia-z) ogni1xo; ty at t = 2.5 s?

  In Fig. below, what isgp3l ck2lw w0p+ auya*.ke+ua.j vs 45 the velocity at t = 4.0 s?

  In Fig. below, what is tz. a/ - lguh*0/shfdcphe velocity at t = 5.5 s?

  In Fig. below, what is the averagoyx-h57uow ; .q okh0imfx7* le velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6lbu,bew ;v r-6.0 s?

  In Fig. below, what is the acqjkf kz:*nxh7 x- 8i7hceleration at 1.0 s?

  In Fig. below, what is c1mb 96,k6ol6x nlogo the acceleration at 3.0 s?

  In Fig. below, what is the average accelerationlh9y w lea j;4tp)y8+u from 0 to 5.0 s?

  In Fig. below, what is the average acceleram7g4zdk qsq9 1yyx8grc:e 6v;;kh6wqtion from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 t vfc5ii:jk 4cg2bj 35 ump6mk3o 8.0 s?

Does a car speedometer measure speed, velocity?rp/ynidh.*av a8f 4l7 {speed|velocity}

  An object can have a varying speed /wj18aei* qkv if its velocity is constant.

  The velocity of an object can be negative whuxft: ,q/,n(5t imgva en its acceleration is positive.

  If one object has a greater speed than a second object, g,g(gqe/k:usthe first must have a greater agks / ,(g:geuqcceleration.

  Two cars emerge side by side from a tunnel. Car A is travelrf;+xp2s4 jd7r1jku aq8 l, lot1ksn 6ing 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 acce(1* i6defwxj nfmfc56vs)b6 mleration decreases.

  A baseball player hits a foul ball straight up into ;x7)u q;lqm z/- ml qck93*ufdqmn +xgthe air. It leaves the bat with agmkfm *mdqn/ -u);qq zlu3x 9cl+q ;7x speed 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 object speeds up, wu.wnzg./h i m-ke7 lt6hat is happening to its acceleration, how-/liu67. k emn.zhwgt does it change if air friction is ignored?

  As a freely falling object speeds up, what is happening n/j2uxl 38nnz2qlv gv 7,nf8 qto its acceleration, how does it change if air friction CAN NOT ln lf, 8/ 83zgnvqnu2nxv2q j7 be ignored?

  An object that is thrown vertically upward will e8 p- o8zx8e)r6lmuov/a(omw return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this r (a8/p r)ee 8m8mlvzuw6xoo o-esult be altered?

  An object can have zero velocit-c wz o7s*/bb2g t:wb cfg-p+iy and nonzero acceleration at the same time.

  An object can have nonzero velocity ar)pc 4yba* l5and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth fletc4*djtaae0 j (s6 rzdn,m)f0p.(+k el4ahvoor making no stops along the way hat+*e ed6az0rc4v(pl.t, (jadskn j)f m 4ae0hs zero acceleration all the time.

  A rolling ball moves d-)kq8h vnd4p from $x_1=1.9 \mathrm{~cm}$ to $x_2=-8.3 \mathrm{~cm}$ during the time from $t_1=1.7 \mathrm{~s}$ to $t_2=5.4 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.4 \mathrm{~s}$ is at $x_1=2.5 \mathrm{~cm}$ and at $t_2=4.1 \mathrm{~s}$ is at $x_2=7.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarte-nk2/w-px1q;cah +biv p;d o vr-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.0 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 straight line, moving ).ex8r 0300sp h2s tca kgz4kgdh ve9m114 m away in 8.6 s. It then turns abruptly and gallops halfway back in 4.8 s. Calculate (a) itxhv0 edh 3 acr9.s24m)0sez0 gtkg8 pks 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 fromeb/ j-zq,su 8ay )tcj x;3k3t xs3+jpy $11 \; m/s$ to $23 \; m/s$ in 5.3 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 froqz (*,eiq*rmwm $22 \; m/s$ to rest in a distance of 72 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed (hm vbouq+2+fof $27 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.3 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks c ; ch)qk+qyyrvzs 3)h:--v xlto essentially top speed abou ycyv :zrqc);- kx v-lsqhh3+)t $11.1 \; m/s$ in the first 10.0 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 uniformly from a speed :k:5n oew -42s(t evuryremd5of $16 \; m/s$ to rest in 4.15 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 928pmywc e*r +q3 m long on the highway. Assuming a deceleration 3p*em ywc8+ qrof $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck4spy;k,zybp//+x bsa 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 mckre 3-zc j;pc3ho6:gin. After exactly 27.0 min, there are still 1100 m cjc6 zkhg; e:o3p-cr3to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$