Suppose that an objebet dc-p0apa;k-s )9t ct travels from one point in space to another. Make a comparison between the displacement and the distance traveled.e-)t;a sbdp -a0t kc9p

  When is the average velocity of an object equal to the instantaneous velocifs y c11mz*+7eaomo;e ty?

  A new car manufacturer advertises that rub l:)7/89hblb ad wttheir car can go "from zero to sixty in 8 s". This is a:rbdu /hab 7tw)98lbl description of

  An object moving in the +x axis experiences an alfa+q3;yg2jp- s2b m ecceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the *lu of;5w5enp East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning it ol;f*5n ewpu5s acceleration.

  Suppose that a car travel) dcyf;rup c0:ing to the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its accelc;:)0u yfcdrp eration.

  Suppose that an object is moving with a constant velocity. Make a statement cotn ciapyh 0qe ;g7(p5f +go0tv xk++i8ncerning its acceleratii 7eyg kpg +;+tiv5poxt+ nah(q08 0cfon.

  If the velocity of an object is zeropohyj h9x 7icyv8 :s,1ue: 0jo, does it mean that the acceleration is zero? Support your answer with an examj o yyj9c huh0:ps718:ovei, xple.

  Can an object's velocity change direction when its acc21ohkf;yk ca+sgy)jo )7(hssm) t69snatc7 o eleration is constant? Support your answer wiyahsc2ost+)91) ks y6o )cg7of n;(skjahmt7th an example.

  Suppose that an object is moving with constant acceleration.- uvbp,*m mi7r Make a statement concermv 7b m*-,upirning its motion with respect to time.

  Can an object have increasingp gcapf6k44wbg3 ,) od speed while its acceleration is decreasing? Support your answe a3f o4 pbpcdkg4w)g6,r with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of gln7ijzv-bp 7ud it xndb(8)lz7c.74 ice. Make a statement concerning its acceleratc78v tnlni4.zi-lbp(g7 b ) x7u7dj dzion.

  Under what condition is average veack arl,(e1q2ultxg7t:5c h- locity equal to the average of the object's initial h:lx -7k,atu e1t lcgq(r25a cand final velocity?

  Objects A and B both starp dni)( nbenwfjv4,,0t at rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compare,i wfj vnn)( dbp0n,4ed to that of object B?

  Objects A and B both startq1yj asj tt-r:*bfl+1 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 c1:tl +tjsb-ya * jfr1qompared to that of object B?

  When an object is released from rest and falls in the absence of friction, whichu up- tfq (s, ))-u2w7pzpufja of the following is true concerning its motion?ppu27z)u, pu t-jfs()w-uafq

  When an object is released from ret twifom4eaczl60/8g9 g v 7+ht,0aaast and falls in the absence of friction, which of the ie v c/ftlza4w70,8o ag0 6+atth9mga following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the g *wtzmh5;cdzfuxo fb,4l 9: 0n4j3wcvelocity and the acceleration when the balzn,3;hb4mf cox*0w4z tfdg ul cjw5:9l reaches the highest point.

  Suppose a ball is thrown straight up. What isd g3*vu w0: *kfie9skjd +;pre its acceleration just before it r 90+erfgde iuj;**wpsk: k 3dveaches its highest point?

  Suppose a ball is thrown straight up, reacf4 /cs .gaw/ciysj*g5 hes a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and a /y.4cfcwj *g/s agsi5cceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls tvct )e6 eaf8l4o its initial height. Make a statement about the direction of the velocity and acceleration as the ball is coming down.vtee 4cf6 8)la

  Suppose a ball is thrown dow,l0z*/z9okwlm tg2: ;(jddq6uy gokp nward in the absence of air resistance. Make a statement concerning it*po6gdzlkmd0gjlu q :2 9/y,k tw(; ozs acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her acceler73d qd b0en3edation when she she rea7eb 3qednd30d ches terminal velocity?

  A ball is thrown vertically upward with u,v rht3qzm c3hzk:.pl**fv fe 85j p/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 se.jmz:t*5lk z83hc uv* eppff3qh,v/r cond 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. One second n17 s zg5fpe h lqwieg*2kwk2 h9z89v7later, ball B is dropped from the same building. As time5 nk pewvgf7kziq8hzel s*92hw1g 297 progresses, the distance between them

  Ball A is dropped from the top of a ble*wr4cs70 49zutv hd uilding. One second later, ball B is dropped from the same building. As time progresses, the difference inuvlcr07e4*t wdz sh49 their speeds

  Two objects are thrown fro09 x bgee(gl/ym the top of a tall building. One is thrown up, and the other is thrown down, both with the same ini g(y geb0l/e9xtial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second br*di+lw :wg,4qu9ae ijick is thrown straight down from the same buiq*g,lu9i +a :w4ijwd elding. They 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. The positi90 7jndxcnb wa8),omaon versus time graph of this objectnaw0mbna ojc9 8dx,7) is

  An object is moving with constant non-zero acceleration in the +x axis. *p oo51y8woa sThe positioa15osoo *w py8n versus time graph of this object is

  An object is moving with constant non-zero velocity in ct f-t2ia q8 k 5v9sdx+: eeis6:zf:abthe +x axis. The velocity versus tik2 8+setsx-ace:adfztb 6:v9:5 iqfime graph of this object is

  An object is moving with constant nho 8( .3wcbvo0sdhw*7/xy eobon-zero acceleration in the +x axis. The velocity versus time graph of this object i0ydvow.c ho8/x3 * bs(ehwo7bs

  The slope of a position versus i17s3sv 9w:)ez a 9nztjgau;stime graph gives

  The slope of a velocity vx i5(u,waffteyk.1s ,99tndx 9c ibg2ersus time graph gives

  The area under a curve in an acceleratifk3b4wt 9b9g 7sv5lguon versus time graph gives

  The area under a curve in a ve4dn yz h)ay0o8locity versus time graph gives

  If the position versus time graph o g4m0312h ;giove jtwtf an object is a horizontal line, the object i0e 3gt;vi mhot gw2j14s

  If the position versus time gra i;p3.d :klmzfph of an object is a vertical line, the object is 3i;pkd.m f:lz

  If the velocity versus time graph of an object is a horizontal +sww(vw:/yzm line, the object i+ymw zv/w(w s:s

  If the velocity versus time graph of an occ1hi.;0e n l-sr7 mcbeol+. bbject is a straight line making an angle of 30 degrees wi1cnbcheoe7.l. l-0rs bic;+ m th the time axis, the object is

  An object moves 15.0 m north and then 11.0 m 1gno/ndd ;e9 vsouth. Find both the distance traveled and the magnitude of the dieovnd d9;/n g1splacement vector.

  A boat can move at 30 km/h in still water. How long will it take a1 /bv+iwk+z bto move 12 km upstream in a river flowinbik bavz1w ++/g 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609c/w0gm 1 n,ta7qt9m98jpzne( 3uma vg m)

  What must be your average speed in order to travel 350 km in 5 q; vlj6y(+b6-ma0 sqb5aqt pj.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 5:its3/lj9smaf/ 8 cf h7 min. What is the average speed of the runner in m/s?8/tc/mlf i3a:fhs s 9j

  A car travels 90 km/h. Hozwm8uso+ 4j 2uw long does it take for it to travel 400 km?

  A ly (light year) is the distance that light travyb szeu e-(;ui.f06ck els in one year. The speed of li;e6(b.0 u-fy zusikce ght 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/hhejd w a9w h*x)u+,s-i along a straight road and you look to the side for 4.0 s, how far do you tra-eah + *,wihw)x9sdujvel during this inattentive period?

  If you run a complete loop around an t)kjp4;m2a93iwt lzj outdoor track (400 m), in 100 s, your average velocity j2jiw9 ap t;k3z)4ltmis

  A polar bear starts at the Nob9p3fln2 cp fq yvo1,6rth Pole. It travels 1.0 km south, then 1.0 km east, then pf1q p3y 6col9 vn2f,b1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km south,c)x.mnh*qxw /z/l f9/ yr*ftc then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. fx .*rtfnwh xlz//9* qcc)/ym This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from schg5ih+zw2q* a qool 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 zqg2w+ *h5aiq minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 kmd. uv ( mscyfn4hs;z0*/h and 160 km at 100 km/h. What is the average speed of the motori0ysh f;czv*(nsm.4 udst for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 1 m (maa72,qj;ofxivj; 00 km/h. What is her average speed,7;aqax ;vf(j2mim jo for the trip?

  An airplane travels at 300 mi/h south f39 hwade leyu. n*:-d h(shlk(or 2.00 h and then at 250 mi/h north for ak l9.he3 d( wd-(hnh *yu:sle750 miles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 10eal7zh31j-y2/ap wdi 0 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for team B, can cojd2lzap1hi3 7y wae-/ ver 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 uniformly and comes to a stop after 13 s. Thmse t;) oige03e car's average velocity during deceleration was 39 km/h. W3e o;giste)m0 hat was the car's deceleration while slowing down?

  An airplane increases its jfe 6(v2r(jlam, uc0 espeed from 100 m/s to 160 m/s, at the average rate of cje 206,fujl evr((ma$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate of:ba;b yn +y6i9mptt4f $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and accmsr n1-f8m xm-elerates 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 spuybt kzjf:5, xrjd,nb4r,r+ 6eeds up with a constant acceleration odb,y 6,nrr 5br,juzx + :jf4ktf $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 1.1 m/s experie 0l e1ogz5jhz-nces a constant acceleration ofz-lh 5g oe10jz $4.8 \; m/s^2$. What is the cart's displacement during the first 10.0 s of its motion?

  A bullet moving horizont6sbp6lje6tq- ally to the right (+x direction) with a speed of 496 m/s strikes a sandbag and6 lqstb-e j66p penetrates a distance of 78.23 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from 2y;jafq1 v 4xaea7 .gma catapult on an aircraft carrier. It reacy4 jvq; e2x7faa1a.m ghes 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 the catapult?

  A car starting from rest moves with constant accela f8m;)rk,3 .rj *.,wyifi0 ytqycydw eration 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 kjltz1 0 1 l fhy;nx5.2zqlzi080 m/s in a distance of 200 m. What is its average acceleratil y0fz2.zz lt0l 1ik xj15nq;hon?

  An object starts from rest and undergoes 0x kzq,fxq1/9edu1h x*x ,v4 xx)orutuniform acceleration. During the first second it travels 1.9 m. How far will it travexxtx) k 11z/0 h4,rfoqxx *9duv xe,uql during the third second?

  An object is moving in a straighc 9vvb pax1s:4t line with constant acceleration. Initially it is traveling at 16 m/s9 :41xapvcb vs. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and acc d8t of95lhpw3elerates 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 tirecfx.jpg5 yglodr2 .t4 2 okrp9bp)mg-/8d1ijs on 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?    $s$ (only input numerical values)
(b.) What is the stopping distance?    $m$ ((only input numerical values)

  At the instant a traffic light turns green (ipga*. i jzkib7f ,bij( olj*e;/t.o, a car that has been waiting at the intersection starts ahead with a constant acceleratiito fiakb ,(*jz.ogj ;lp.7e/i* ji(bon 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 th0c/tbm ipg0xqsg+:6ig *i 8zhe surface of planet X where the a qic 06+miti:*g0/8zxb hpg sgcceleration 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 s58/3murox 0gpg 0 lnsupeed of 12 m/s on the surface of planet X where the acceleration dxu5 8srn0mg/3ug lop0ue 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 5, qbs;)flm9i7f tlqua speed of 15 m/s on the surface of planet X where the accf s t9 ,filmuq;b75lq)eleration 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 a spejm ;v 2n9fve*ekay xq0s21qo6 x4bay9ed of 14 m/s on the surface of planet X where the acceleration 2*ky f2; ymv9aoqeqx 40jnv9x1ba es6due 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 t (9n6 e9vui2) 7-nr:hahdorr5ygidaphan 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 falrnu prvyhan 96e(rd2o hg9a5i-7i): dl before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What izha+p diyg, ; -inli ;1. whz2mtj)7xks its velocity after 3.00 s?ly ;aw;hi g, -7dkiziz2.n)mxh 1p+tj

  A bullet shot straight up returns to its starting point in 19 s. Wh k1utt lbgqsr*tt(7 /dn9)sw /at is the initial spg 19t( /dtsultb* 7swtknr)q/eed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it take 8xmygvj4 g-t q/)fc8rvy z;4cto return to its startiq/;)848vm-xy gtf4 zyr cjvc gng point?

  A ball is thrown downward from46nr j/ 659qkvqbs0eg fijj .z the top of a building with an initial speed of 11 m/s. It strikes the ground after 7.3 s. How higz/ 0kej.q6n5v4b j q96ir fjgsh is the building?

  A ball is thrown straight8pi xicq 0d+.z rzs uv9yett5/m5*ci7 up with a speed of 30 m/s. (only fill in numerical valuem09 +id5t 8* iuzqcxti.zv5r ype7s/c 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 u (uan t:uz:y*sp into the air with a speed of 45.1 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 15 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 15.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is theg9hxbxurz (e *or )e6 d4td)3 :bvx5tg velocity at t = 1.0 s?

  In Fig. below, what is thesf9z z6u : eh2wqumee(6o -fb8 velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t =9y:u : nclc,rx(y(deu7t8tdx 4.0 s?

  In Fig. below, what is the velocityxz/gr;/ csd 8hki( bkr4jbo,2q/* jfe at t = 5.5 s?

  In Fig. below, what is the average un5erz1meo 5 )w5wihdhe3:p *velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity fro 3ks0nym8f bx(a:ms9e51h w kum 0 to 6.0 s?

  In Fig. below, what is/nwe6vfzbu ht2n ,1 dnf)qu,7 the acceleration at 1.0 s?

  In Fig. below, what is the acce2 o6es0+im05xsh mju ileration at 3.0 s?

  In Fig. below, what f jutku/86(.sepn -vjis the average acceleration from 0 to 5.0 s?

  In Fig. below, what is tby/;2unz ;r*zna5c v ohe average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from d;)e*h z(v6l0 . nirwil; djav0 to 8.0 s?

Does a car speedometer measure speed, velocity? {sp ;/),16 / jlrjvdqd ;fnqipvqidm *x,zeed|velocity}

  An object can have a varying speed if its velocity is const9 onzq q0 m:ooc2gt6f7ant.

  The velocity of an objectf5 unbh2c-fa00uhf b; can be negative when its acceleration is positive.

  If one object has a greater speed than a second object, the f; 2 dcuod d15d3nroa9wirst must have a greater acceleratio21d3rddaoon uw c59; dn.

  Two cars emerge side by side from a tunnel.:w (s7fex ayjg6;u*xq 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 speeds k0yn)e y4n9q as its acceleration decreases.

  A baseball player hits a foul ball straight up in um- 7s+i.klm lqcr2+yto the air. It leaves the bat with a speed ++riuq-lmlk7m .sc2y 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 happen3gzup :o 2bye5l a4nd9ing to its acceleration, how does it change :g5aopb 9 zn 342uydleif air friction is ignored?

  As a freely falling object speedsftus :6jnuln w4ocw,jwq*.8 8 up, what is happening to its acceleration, how does it change if air friction CAN NOT be i fonl.:nj*8wj6wu 4 c, utsw8qgnored?

  An object that is thrown vertically upward will re2i,yj p *k*neoturn to its original position with the same speed as it had initially if air reseon2 , k*yj*piistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and non3yemvs yg j9)+zero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at thewubc7yr1ti(t74 dp*yrm22q l same time.

  An elevator moving from the second floo2fpr gw4- qb;uo b:kz)r to the fifth floor making no stops along the way has zero acceleraw2rq-gbfb :uz;p)o 4ktion all the time.

  A rolling ball moves fr2es t p6 x*47pw/3eog6dv.pmhmhi+sr;mf* ax om $x_1=2.8 \mathrm{~cm}$ to $x_2=-5.6 \mathrm{~cm}$ during the time from $t_1=1.1 \mathrm{~s}$ to $t_2=5.8 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.9 \mathrm{~s}$ is at $x_1=3.3 \mathrm{~cm}$ and at $t_2=3.2 \mathrm{~s}$ is at $x_2=8.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quartelcgu9nr1+*( nf mw*dpr-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 stragy492vugx9uc4 l ;ymek ;v4r vight line, moving 98 m away in 12.4 s. It then turns abruptly and gallops halfway back in 4.8 s. Calculate (a) its averagevy y;e49gxk;9guv c24lm uv4r 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+jo ,3oaurxw/ $10 \; m/s$ to $25 \; m/s$ in 4.9 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 fro ajh9tn aduajc u5i1+fov/k v0*+.w2g m $16 \; m/s$ to rest in a distance of 71 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reacf.ar.8c5 g4 nisu gx1hh a speed of $30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.8 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top speed abof ku9* xn z2*yplq.y;nu*y;nlpzuk 9. n*2xfqyt $10.3 \; m/s$ in the first 13.5 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 uniformlyqklx2m,+q moo k7h ;d: from a speed of $19 \; m/s$ to rest in 4.19 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. q+.i0k pz,ktt Assuming a dec kkt.q pz0ti+,eleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going cf)g/x j*lkmlo+7k c:$25 \; m/s$ 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 lesaoo(, et 3+(kv:ggqy rs than 30.0 min. After exactly 27.0 min, there are still 1100 m t,et(gavo+qo kgr3( y :o go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$