Suppose that an object travels from one pox6xe/v wp9gnc 7h lxy2l, m.da6wc4o.int in space to another. Make a comparison between the displacement and the distance tra co.hwx m,pclxy 6a47 9xleg/ 2wdn6.vveled.

  When is the average velocmry(j sfu-y569qbm .a ity of an object equal to the instantaneous velocity?

  A new car manufacturer adeaq 1,(4i(jfq8qcy n hvertises that their car can go "from zero to sixty in 8 s". This is a descrip (ey4(j ,8icqnaq qhf1tion of

  An object moving in the +x axis exm. an5pnv(fgf ,.kdzgzh+i 1b5 z0nu3periences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car t ;.ky0av /pefxa+*a. ljzjse1 b;.mwsraveling to the East (+x direction) begins to slow down as it aael;ap0ef/sk; jbz ma.y vs.xw. +j1*pproaches a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the pcgi0f3 h.n)r West (-x direction) begins to slow down as it approaches gf)nhp3c 0. ira traffic light. Make a statement concerning its acceleration.

  Suppose that an object is0sq5 u yt(uai6 moving with a constant velocity. Make a statement concerning itst s6iu0yq5ua( acceleration.

  If the velocity of an object is zero, does it me y i obpo2s4kwgh2d0id-1+v.e an that the acceleration is zero? Supportdiwo+ h-y0gb 4.1kv2iop 2sed your answer with an example.

  Can an object's velocity change direction when its acceleratijjp,ckk./ fobg)+ kv1on is constant? Support yob g).,+ fkkcvp1/kjoj ur answer with an example.

  Suppose that an object is moving with l489:d,e rsv*pt dvuh constant acceleration. Make a statement concerning its motion 9ed8v 4:*tdpvsu ,hrl with respect to time.

  Can an object have increasing speed while its 4b r-ukkmq y*s+h3r-dacceleration is decreasing? Support your answmdu-ry*4bkrk+-3hqs er with an example.

  Suppose a can, after an initial kick, movfx,a9lo/ ahm 5es up along a smooth hill of ice. Make a statement f al,x/9m5hao concerning its acceleration.

  Under what condition is average velocityio2 0qqgglj/cs3j-0(s )rsp o7i (e sj equal to the average of the object's initial and s7si)jqicg03 / o2p(-sesg( qroj0jl final velocity?

  Objects A and B both start at rest. They both accanqd4v64-9g3g;o h +a kvoz8yevgcl 5elerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of obje5cn 8oqzvvy;g-a6kd9+v 4l 4 eagg oh3ct B?

  Objects A and B both startfoi4k rog8ecy 575w atv/,mq 3 from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A comoq5tc/y45 ro7wfk, i8 amv3egpared to that of object B?

  When an object is released from reb1o+o c 8ja;gzst and falls in the absence of friction, which of the following is true+ bg8c; oa1zjo concerning its motion?

  When an object is released from rest and falls i p(s 97q4cbu7fwu nc ha47cn1fn the absence of friction, which of the followins(4 u 4ph9wb cf77cqfc1a7nung is true concerning its motion?

  Suppose a ball is thrown straight up. Make a s 9a9 gtp qlond4)/bfyk mmh (7,y)mdn5p(yo)ptatement about the velocity and the acceleration when thep9ftdom(gy n),l )ykb 4 7q/d y oahnp59p)(mm ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just b3s3ek2j koixfg9 o9vg.-)q bpefore it reag qvs eki9pgk )bj-2of3o3x9.ches its highest point?

  Suppose a ball is thrownu7x.r/y a0 qdbf;u aloo(0l 7p straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and accell/7upqdrx0.ylf (7uo ;o0a aberation as the ball is going up.

  A ball is thrown straight wn694 3smyzfy up, reaches a maximum height, then falls to its initial3mzwnf46 9ysy height. Make a statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air rscz9 eky p6)j1esistance. Make a statement concerning its accp y9ksjc 1)ez6eleration.

  Suppose a skydiver jumps from a hteopre wi:y oko08/j e 1d,s1,igh-flying plane. What is her acceleration when she she reach/kp owyeseo1tr8:10je,o d i,es terminal velocity?

  A ball is thrown vertically upwardoc+z*u6z o izlzp )x:k5)w3n ( ciz8nb with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to that of the first ba( cz zipi*)lz 6couxn8:okw3b+5zn)z ll? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. One second latere4 6oz+ xmiuw3 1j ets0p0r2ii;k;pwe, ball B is dropped from the same building. As time progresses, the distance betweenriuw0e0 epto xzj2ik6wip +13 em;4;s them

  Ball A is dropped from the top of a building. One second later ohf q:er, z-a(ldz8(l, ball B is dropped from the same building. As time progresses, the dif o :f8lzral,e-(h dz(qference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown up, and tr;t r9s;uzd-l he other is thrown down, both with the same initial speed. Whal;;sz9- rutdrt are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is throwz/ (l5w:cf;5 ah+ klh tw,vvspn straight down from the same building. They are released at the same time. Neglect air resistance. Comparla(vl/ c5 +f;wzk5wtsph h,:v e the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The 4 radmuf t)00r1po9 bmposition versus time momrr 41)0pa fd0 utb9graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. T s kw6a0: jb16xt9pgyjhe positib60gs9:1ky awt6 jp xjon versus time graph of this object is

  An object is moving with constant non-zero velocityz0h(l)d iuk- zstx ,yxoz n7;jkti07, in the +x axis. The velocity versus ti -, i );txtyx0j0huzz zk7dl,7o(k nsime graph of this object is

  An object is moving with constant non- q)v5j;0h 2xb oxiwp.1: 4an ;mg-wu9eizf wrfzero acceleration in the +x axis. The velocity versus time graph of this obj:em;x .uai92rx4-ibg51w )h0w o;f nvwq fzpject is

  The slope of a posit7pwq s++x /zzsion versus time graph gives

  The slope of a velocity versus time :ht0e: o)j eqdgraph gives

  The area under a curve in an acceleration versus time gxxs. 1umr *lgc;.y b7graph gives

  The area under a curve in a velocity vert3ot (1wt 7x b14rlwwesus time graph gives

  If the position versus time graph of an object is a horizontal lineh;/i-d7c 5h22:yqph ofd 4kwvmjak 3p, the object i2w2 fdcj/4ma k:-;dyvqok 37h5php his

  If the position versus time graph of an object is a vertical li: .p benbg y(9g)sqo.y ;w4xqpne, the object isnq)g y. bxoe pbsp;9w.4g :q(y

  If the velocity versus time graph of an ob7)o1 edvcq9*zmw ,29lh htxobject is a horizontal line, the object im h,)9tlv c 72dhxe*oo9 z1qwbs

  If the velocity versus time gr 6,y qug4,i izl)2.wct* ptkmsd9bhe1aph of an object is a straight line making an angle of 30 degrees with the mwlzch*ku s6 )tg91bd q42ipi,. ,t eytime axis, the object is

  An object moves 15.0 m north and then 11.0 m southvp rbrtx6a / fmubk3wvx+y/ov82k o (4:taa-0. Find both the distance traveled and the mb(wyx tv kr2 pmof +0vv-aa3o/btk4xa/u:6 8ragnitude of the displacement vector.

  A boat can move at 30 kmujce: -9sdw-,jxx (fj /h in still water. How long will it take to move 12 km upstread9-,j-fxx :s uce w(jjm in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? q3mzd:f h )n(r(1 mi = 1609 m)

  What must be your average speed in order t0z: r pjg5x s(kq1xmb6o travel 350 km in 5.15 h?

  A runner ran the maratmcuw*h/6 x+zx hon (approximately 42.0 km) in 2 hours and 57 min. What is the au xcw z6+m*xh/verage speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it g0bb;xm xyl,76c-vev+g0od) sk bu j2to travel 400 km?

  A ly (light year) is the distance that light travels in one year. z;w md2hn g*b:The speed of zgd;h*:bwnm2 light 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 k:azbn.;8cvj2 wov76pjl:zq p m/h along a straight road and you look to the side for 4.0 s, how far do you travel during this inattentive peri.ocv n7;jza: 6p82lj zw:bqpv od?

  If you run a complete loop aro4pcgzeel2n.alt 8b32 und an outdoor track (400 m), in 100 s, your average 3cgnbt8 az2l4 .ele2pvelocity is

  A polar bear starts at the North Pole. It travels 1.0 km sout ,j+w8ogl mjd)h, 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 wa) d+g,wjjmo8 ls the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, e9 jxc/2ic/, ro+ xvzhxb(p2s then 1.0 km east, then 1.0 km north, then 1.0 km west to retuo2(expx2 v+ csh,9 b/zic/r xjrn to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weeja)9szbr u8 /akend from school 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 minutzs/9)rb8aj a ues. How far is your hometown from school?

  A motorist travels 160 g:w y8fb4tuwa,vn3 cy 01zlm3km at 80 km/h and 160 km at 100 km/h. What is the average spe ty8w03cl ,vn4 z3 g:yaumbf1wed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. W37 d7wsytsmsx5(wrx + hat is her average speed sx77s+x3 wrdmt5ysw( for the trip?

  An airplane travels at 300 ml4b g8 ft8cjs+i/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speej 8s+fcbt84gl d for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m)qao i7y /e; stayh9c,( for team A can run 100 m in 9.8 y;ce,a /ioyaqh7( st9s. His rival, the anchorman for team B, can cover 100 m in 10.1 s. What is the largest lead the team B runner can have when the team A runner starts the final leg of the race, in order that the team A runner not lose the race?

  A car decelerates unif4frmrqgkw b,iy24 31eormly and comes to a stop after 8 s. The car's average velocity during deceleration was 38 km/h. What was the car's deceleration while bry4k,w i342m1fr gq eslowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the averags(0o(sqkuo, g (zz wgz1h ;7gee rate of g01 (skzgo(7os ,huzqg;e (wz $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accel-a e2 /4aw8 hpnje2qrnerates 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 accelerates atibjfg0:a/0 69g abwro $4.0 \; m/s^2$ 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 raxedh :8f. hax5 z9a5with a constant acceleration 9 h:xd5 zfxrh 5aaa.8eof $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 68fh+r0 4iusecce,fkl54c 0 kv .0 m/s experiences a constant acceleration ofkk5,cr vesi0hfluc4f80e+c 4 $4.3 \; m/s^2$. What is the cart's displacement during the first 7.3 s of its motion?

  A bullet moving horizontally to the right (+x direcjo..ubas9 - hg x*flhsnj,3p .tion) with a speed of 508 m/s strikes a sandbag and penetrates a distance of 69.50 cm. What is the average a, x .uj .n3- 9spgajhh*.sbolfcceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched ,:yyzb0b+n.v xk emx6 d;z,igfrom a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requi 06enzxybky;.bdx z ,:,m+ givres 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant acceleration oir v-kj iu1j:)f $2.0 \; m/s^2$ 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(751nssyp i.qkrz ju;/s to 80 m/s in a distance of 200 m. What is its average ac(pqjs5iury7 1 .snz;kceleration?

  An object starts from rest and undervdfx)o 5qxd58d;vj( tgoes uniform acceleration. During the first second it travels 8.2 m. How far will it travel during theqxdj 8odv5dx(t5 )fv; third second?

  An object is moving in ubo -7ijpy *4h(xy 4c(fvwj d;a straight 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 ti j( f (vw7jxoi*ub4hpy4-dcy ;me?

  A car starts from rest and accelerate1 l/+du te9et5sml/ hrs 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 deceler96uch mwj )zw;ate 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 green, a car t(,g seqfv. wm;.ue sz3hat has been waiting at the intersection egz ;ew. ( 3m,sfuv.qsstarts ahead 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 ofidzq 7je,* q s7*y+ pb*hwq ozqx+h7d- 12 m/s on the surface of planet X where the acceleration dueodqpq hz-7*7ez +j+,7dxqb *w*sqihy to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speeh0lyjz.yol 6j nug2: +d of 12 m/s on the surface of planet X where the acceleratil6ny+ :h.zyulg 20j joon 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 speed of 15 m/s on the surface of planet X wxrp.xq/ 6o g-where the acceqpgx-rx w o./6leration 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 upward with aadr;0m n v/s yb:lkk5 xf :kyc,ts/o)7 speed of 14 m/s on the surface of planet X where the accevkx;/s a)/ k:ty,m:7lkrf5 scnoy0dbleration due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater tz+af5s8drx*c pt -d;ahan 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall taf+ zasr-d8*5px;dcbefore you catch it?

  A ball is thrown upward at a velocity of 19nqsh2o5f 4kb3)+ ly zt.6 m/s. What is its velocity after 3.005n+zt3yk hs)24l bq of s?

  A bullet shot straight up returns f6(;g i+ib zktm):d gkto its starting point in 13 s. What is the initial speed of the b+d;imifgkg zkb6t )(:ullet?

  A ball is thrown straip-vmcfklxn j 8/1e,; z6v xd8zght up with a speed of 36.0 m/s. How long does it take to return to its startingk vzlf pj cxnz8 e,d6-/18;vxm point?

  A ball is thrown downward from the top of a bfy7 6dbkiw-u3lvs :,h uilding with an initial speed of 12 m/s. It strikes th7usvi,kfwlb : hy6 d3-e ground after 4.4 s. How high is the building?

  A ball is thrown straightzo,r sqah;9-8 +uorj q up with a speed of 30 m/s. (only fill in numerical value in thosq+rj9-aho;8uqr z ,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?    $m/s$

  A foul ball is hit strh: up/k*r6vvo+ i3by vaight up into the air with a speed of 23.6 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 11 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 11.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1.0 si ;kh(puo4(dw4shy o5?

  In Fig. below, what is the veloc x.s8rzu/wwz9sedl,/ro n s+/ ity at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.0 s?n)dyubhp3 t 1y(: dyy.

  In Fig. below, what is the velocity at t = 57(sujei -h/l g zuh5;i.5 s?

  In Fig. below, what is theq .xyv q3szl:: )m6gxe average velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 8wv,u+g.btbpxp ; 9wsto 6.0 s?

  In Fig. below, what isi,hu w :4i3esp the acceleration at 1.0 s?

  In Fig. below, what is the acceler d7)kqu8f8mo v)wusc 4ation at 3.0 s?

  In Fig. below, what is the average accelee tt(h+hih 8qgeae c))ic8*j*o:8gbyration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration fro06bl)+wjm qtj )eeo g2m 0 to 8.0 s?

  In Fig. below, what is the displacx5txp0hh8e )nement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speedw 2ox srhjstbbni.-+7fz.( d-|velocity}

  An object can have a varyinc,* k axyjtw;+c8k)hq g speed if its velocity is constant.

  The velocity of an object c+w*8mbt 5 sckzan be negative when its acceleration is positive.

  If one object has a greater speed than4*+r2gdkyh3tj ()p s/ c za/cfp)x csl a second object, the first must have a greaterctp p4aly gsk (*s) x/)3hc zj/r+cd2f acceleration.

  Two cars emerge side c en/ sdw;h2w8 2ke/awnf7edt)e ;xc6by side from a tunnel. 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 decreases.8wwbo pf9p )nz)sz3rgzu p-z zqv4.)4

  A baseball player hits a foul ball straight up into th w+0bl* w1hd;k ,gizxje air. It leaves the bat with a s,+lz xwwgid jb01;h k*peed 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, what is happening to itsb9j.uhs;iv/ w acceleration, how does it change if air friction is ignored.;jws/vihb 9 u?

  As a freely falling object speeds up, wha/5w0us 3c+,nk bwyan. yqal0wt is happening to its acceleration, how does it chauw3l0wynykn,wacs .b a +5/ q0nge if air friction CAN NOT be ignored?

  An object that is thrown vertically upward wil8znzx1d cp(l *p 7dmr1l return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appm8c *1dpzzrpdx7 1ln( reciable, how will this result be altered?

  An object can have zero velz5vcx*f*v9 bzpgdk / 5zys)t6ocity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration are nt(vi rgeh(-bb6n 09z 3d/ht the same time.

  An elevator moving from the second floor to the fifth floor making no stops4sw7 ;f1fm*lw ylk5g v along the k*l5gwl7;m1vff 4 ysw way has zero acceleration all the time.

  A rolling ball moves from 0xfz*j+ :+lk +2ebz0h pawlrcnps*o :$x_1=2.4 \mathrm{~cm}$ to $x_2=-7.8 \mathrm{~cm}$ during the time from $t_1=1.7 \mathrm{~s}$ to $t_2=6.0 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.7 \mathrm{~s}$ is at $x_1=2.9 \mathrm{~cm}$ and at $t_2=3.1 \mathrm{~s}$ is at $x_2=8.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps aroumz9v1f2 2 h *bwyerp:hnd a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.9 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 106 m awdl 82qyfio j7(ngpw9:r9 cd/9t tab4 day in 11.6 s. It thenq:979low2yr tj /abptd(cf g49id8d n turns abruptly and gallops halfway back in 4.8 s. Calculate (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 fr7*ar nih-sg o p )n)ratna;:,gom $11 \; m/s$ to $23 \; m/s$ in 5.7 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 frori5( z xjeix7(m $17 \; m/s$ to rest in a distance of 82 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach 5j(2 gwd2edue a speed of $31 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.7 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentrzcgxjy// tm5w:z -pjr yc+crs7n9g64* in0n ially top speed abou j5:+cnt70zmwp *g69/y nr4/zyrrx - njsiccgt $10.5 \; m/s$ in the first 12.6 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 uniformly , rfa 1/mkhcdb) 07gkgfrom a speed of $15 \; m/s$ to rest in 5.17 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m long on the highway. Assuminuc,.u(4 g4 zvm*njynlql9md+t3p6u fg a deceleqc4vuz+njf pd 9lumymult,n 3. (4g* 6ration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck g-*,tmjgzv:daf, mfc6 oing $25 \; m/s$ 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.b8q5i4;/2ehv- gw zknkky uy.0 min. After exactly 27.0 m8hi kw ynz; yb.u5v 4keq/-2kgin, there are still 1100 m to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$