Suppose that an object travel ,g,yiz wbmp 7l:1po+zs from one point in space to another. Make a comparison between the diszywol ip,b7:gp 1 m,+zplacement and the distance traveled.

  When is the average velocity of an object equal to the p/)esvy q)mby7i4 u 8finstantaneous velocity?

  A new car manufacturer advero bsp *1hftjg3a3 yx-3tises that their car can go "from zero to sixty in 8 s". This is a descr s3yh1xft3*a - p3ogjbiption of

  An object moving in the +x rtjx70 y y8q.vp5m(zvaxis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins tut7bbr *s4go07 w vmdtr :s3b6o slow down as it app7b*0wt6r4 bm:bvssd 3g7rutoroaches a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow down 1 b5b oz*:hu*g+ltzwu gr)n9nas it approaches a traffic light. Make a statement concerning its accele*ohg1t59w+zuu* g nlr bz)nb :ration.

  Suppose that an object is moving with a constant velocity. Make a state.*fvgh1 5amlg;3;s.aonl ywb ment concernin;*bg3v .5osa.hwy n;l fglm1a g its acceleration.

  If the velocity of an object is zero, does it m*bhuwn,jn vp;/0uye8nz/b4 g ean that the acceleration is zero? gnuv p 4/b;nuj 0 ezn/y8*wb,hSupport your answer with an example.

  Can an object's velocity change direction when its accelebtm98h 1(l8rg 0 qrlcbration is constant? Suppo08rgt91 (c bhmrb8q llrt your answer with an example.

  Suppose that an object is mov(z x +1ha*/a,pstcy+ wnkrtg/ing with constant acceleration. Make a statement concerning its motion h naa/zxgt1ywprc(, t /+*+k swith respect to time.

  Can an object have increasing speed while its acceleration is 7e;-jn yv+av2f ei r+aw+2m-abflf 4odecreasing? Support your answer with an f2o +nm ffvwa-birj2; a+lye +v 7-4eaexample.

  Suppose a can, after an initial ki qw7zb g)au;;oed7/ex ck, moves up along a smooth hill of ice. Make a statement concerning its acceleratioduoa z;q/eb wgxe7;7)n.

  Under what condition is bg +0qie 4a.oob t6n7xaverage velocity equal to the average of the object's initial atei4ono.0bb 7g6 +xaqnd final velocity?

  Objects A and B both start at rest. They botfl 59 v(uvjgh;h accelerate at the same rate. However, object A accelerates for twice the time (vvul9;gj f5has object B. What is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the same rag0,u wd-n ,phdre*cc.te. However, object A accelerates for twice uc nw-g,,r0hc dep d*.the time as object B. What is the distance traveled by object A compared to that of object B?

  When an object is rele+lq6s : j+kzy. kihog5ased from rest and falls in the absence of friction, which of the following is true co5 o+:yhj z 6i.ks+qklgncerning its motion?

  When an object is released from rest and falls in the absence of friction, whiua ci0+xrmlsq) jc*2ude q +-,ch of d2s )+ ecijl+ruaq*ux-0qc,m the following is true concerning its motion?

  Suppose a ball is thrown straight up. M/p: q1 af4ehyuake a statement about the velocity and the acceleration when the ball reaches the highesaue/4fq: 1pyh t point.

  Suppose a ball is thrown straight up. What is its acceleration just bef jhn3gdxq5 rj/,7om n4ore it reache ,xhgmqjno n57/r j3d4s its highest point?

  Suppose a ball is thrown straight up, reu7qtebw q5qd m1. ee85aches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as thee e qq5bw5u1d8.m7qet ball is going up.

  A ball is thrown straight up, reaches a maximum height, tv w: r8um5 ap8) 51cuzj0tcxjjhen falls to its initial height. Make a statement about the direction ju:wrj )p uamc50v88txc51j z of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absenda a73y; o/keqce of air resistance. Make a statemenq3a/yedko a;7t concerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her acceler6eja1bb v/f/kv c (ev(ation when she she reaches termina6(vje b(k1vvfe/a bc/ l velocity?

  A ball is thrown vertically upward with a speed v. An identical second ball iskj*5ok:b gvqo( -;vpae2q 2 rn thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does the sev ;j*-nkog 2ber5vqk 2:p o(aqcond ball go than the first ball?)

  Ball A is dropped from the top of a building. One se ewe gnhapjspqlzf:9 hy;8dp93,. x l)8j va04cond later, ball B is droppswjg)q84e; dn8vhaz9p3lp,a9:fex pjy h. l0ed from the same building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, dmg59z ,vxe0cball B is dropped from the same building. As0,zx cdgv9me5 time progresses, the difference in their speeds

  Two objects are thrown from the top5 -+ f jj; zubzi0n399hkeh vzag- anf()ghs;c of a tall building. One is thrown up, and the 5(hg huzk9cfa9z+zegh f0;va )j -sb3;jin n-other is thrown down, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the toq w1fuhy-a c3gk2(fi4+ef i(c p of a building. A second brick is thrown straight down from the same building. They are releay gqfa(fkcew-h+(3u cf2ii14 sed at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero ve3- hsxx:s(q ung 40ebolocity in the +x axis. The position ver3b-xq ose:hs u 0g4n(xsus time graph of this object is

  An object is moving with constant non-in xdftr5*6o2vmah6 :+jrt g.zero acceleration in the +x axis. The position versus time graph of this obn . jr6frm hxt*dg voi5t6a:2+ject is

  An object is moving with constant non-zero velocity in the +x,e/zzt 2 8yrix axis. The velocity versus time graph /i,xrze8 yt2 zof this object is

  An object is moving with constant non-zero udcx *mdw*3 .nacceleration in the +x axis. The velocity versus time graph of thi*d3 xu.cnm*dws object is

  The slope of a positiohr4ejt1rs( d8 d,.opm n versus time graph gives

  The slope of a velocity versux./o t/ rzsblmhb+46 os time graph gives

  The area under a curve in an acceleratiofrqn -66-41fbnhnvk2o gsm2x n versus time graph gives

  The area under a curve in a velocity versus )q83w kb*etwjakgx0m 23 g ql8time graph gives

  If the position versus time gruls zvbj:.5 20bructur42j .vaph of an object is a horizontal line, the object icujl: 2 2b5 jur4t.uvsr .0zbvs

  If the position versus time graph of an object is a vertical line, the object vh bh +b/r5a, ;sd2/sxchq0px isp,s5;rdha/2 h xc s/h+v q0xbb

  If the velocity versus time graph of an object is a horizontal line, the ob n:iwrpxj w-.2ject :np r.j2 w-wxiis

  If the velocity versus time graph of an object is a straight +:lz1suo 3l- bwsm-w i8 b0uwpuj*4uiline making an angle of 30 degrees wb- 3wuu*0j14p-sbolmwisu8 ui z+wl:ith the time axis, the object is

  An object moves 15.0 m nr2zw* 1taw vr .ib0)eoorth and then 11.0 m south. Find both the distance traveled and the magnitude of the displacemeb)o w*wi2 vztrae01. rnt vector.

  A boat can move at 30 km/h in still water. How long will it take om5 7jn l mtr79zk8osm)x:vf,to move 12 km upstreatfm9r7lkxmvnj z:so) ,85m o7m in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1u6w;4xht7lli 6/ (;yfo0czjxcle )m g mi = 1609 m)

  What must be your average speed in q;1b3 -dmd*u6m kkcp0tn rb1norder to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 j3a rg96-xibu8 2y( js mb-loj,vey s)km) in 2 hours and 57 min. What is the 3,)b8ujxi(j2sar-gbesm o j9 lyy v-6average speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel 400lo060io2id b n km?

  A ly (light year) is the distance that light travels in one year. The speed 6kxg xt* np6,rof lig,n6 xt pkg*6rxht 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 strai huk5hxmqk 24+ght road and you look to the side for 4.0 s, how far do you travel during this 2h m+k5uh4 qkxinattentive period?

  If you run a complete loop around an outdoor track (400 m)-g7b0j9b yz ugbw9zk /;ze e5d, in 100 s, your average velubjz; e0 w 59g7ykbz9/z db-egocity is

  A polar bear starts at the North Pole. It travels 1 .3685v c7a(*adjduvb cm lpfd.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 average3a6ddvd7j lm8pu *.f(5a ccvb speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.xu f:b2t6tx( r0 km east, then 1.0 km fx6:x(bt r 2utnorth, then 1.0 km west to return to its starting 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. It th:aw;n1(6uhn 3sf q lexen starts to snow and you slow to;fe3(6 u: hxqna1 slwn 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is t)4 fdg)d.ww 2ji*jesltx9id4c- fcs/ he average speed of the motorist for this trip)w .)wt9x 4dg2e-j*ilds4c/dffjics ?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h4 *xzfl8uv+jf p:(e pn. What is her average speed for the trv f (:xnleu+fj 48p*zpip?

  An airplane travels at 300 mi/h south for 2.se :a25zxt e 8evfjb7-00 h and then at 250 mi/h north for 750 miles. What is the 5e-2j8b v7e: faezx tsaverage speed for the trip?

  In a 400-m relay race the anchorman (the person who runsdq/cqkofmsy( 8 f,b4 - 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 fina-mf 8f(qc/q yk, 4dobsl leg of the race, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes to a stoply0co s l:d.sh(y: re- after 13 s. The car's average velocity during deceleration was 77 km/h. What was the car'oydycl(.r s0 el s::h-s deceleration while slowing down?

  An airplane increases its speed from 100n7rgsaz5y0ytkem510 u 1 mq:g m/s to 160 m/s, at the average rate of : m 0qsgg71re zmya1u0yt55kn$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/hvov:*u7rpit:u/s oj s3twd4p 2ud5 8fmb6g - j accelerates 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 accelerav4 pv-:ow1vml jgot x e(+xw7(tes 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 wit9*g68xp,1 0d zi jdpqczi1iwsh a constant acceleration of zpp11*z6i9cw sidjxg0, 8dq i$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 4.1 m/s expek.;u4 xraj9 aariences a constant acceleration of 9r;4akaau.x j$1.7 \; m/s^2$. What is the cart's displacement during the first 8.5 s of its motion?

  A bullet moving horizontally to the right (+x direct /)j;fdp6jtk fttu7)d u83ibrion) with a speed of 561 m/s strikes a sandbag and penetrates a distance of 84.16 cm. What is the average ac;pktruft f8 ) b67 )d3tduij/jceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrier. It reac )xbj )dl;32njts3hnohes a sp )lnhdbj;32s o3nxt) jeed 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 im;4dsv(u;va 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 distan l h/mp*8izi rt4c in1 pubb31ey6oh:8ce of 200 m. What is its average aclecho:8inm 3z/ruth i86p11 bby*4 ipceleration?

  An object starts from rest and undergoes uniform acc k7oi a aeq;uyz*-8ih+eleration. During the first second it travels 9.7 m. How far will it travel during the thiryh iqz+* a 7ko-aie8;ud second?

  An object is moving in a straight line with constant acceleration. :pad6l:i*ns ug9.gkntj1 l x7 Initially it is travel9 pak:lgj:l6snnx.g*1 ud 7 tiing at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates unifo01f. ;d 4llvgjf z:xhfrmly 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 drygfp0kx5 sj v2.xe7*8 kib*uzq eub;3o 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, 3wxfam)xx /-d a car that has been waiting at the intersection starts ahead with a constant accw)md x/a f3xx-eleration 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 th. jfw+b6wwip;xr6f 8re surface of planet X where+bfi;wf86x.r rj w6wp 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 planet X wh4 ,/;nup. boe(wejrmkere the acceleration due/j;(bmr, ewn. 4epu ko 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 they))q;e7jai-gm: ld al surface of planet X where the acceleration due to gravit gayilme)7daq)l ;j :-y 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 speed of 14 m/s on the surq9tp j5k;c0scds3u 4iy2uuw8 face of planet X where the acceleratd58 wu0s3cuujs 2;qiy9kt p4cion 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 greatervf,jn+ l3 s/gf er4by5 than 0.10 s. If your friend holds a ruler between your fingers and releases it without warninng yjer5 v,f+4sbf/l3g, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity 4ynfd0yoj8 c g+ i6y,9+qytzb after 3.00 y 8jo,t4n d+yyfibyg6+c0qz 9s?

  A bullet shot straight up returns to its starting :zvn e3,/s2 jctzqmq /point in 15 s. What is the initial spetj2nq3,/ms/ zvezcq :ed of the bullet?

  A ball is thrown straight up with a spev h7,+ tyhtn8)ngc a2ced of 36.0 m/s. How long does it take to return to its starting poinahcv82c+y nn,h)7tgt t?

  A ball is thrown downward from the top of a building with an init 5kw al(dzzur.8,q ,nqial speed of 24 m/s. It strikes the ground after 1a n5w(d.,uzql z,8r qk.5 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fp, zqy:yj2+ps ill in numerical value in the blanks y,y2ppj+ qsz:)
(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 the37a 94lu.wt9pv4xpv cs7l hbe air with a speed of 45.8 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 10 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 10.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1/ -)jdqa) n ,8vgqb/cvj-ipm q.0 s?

  In Fig. below, what is the velocity at t = 2.5jbe /tiztdco2 -qq+ 39 s?

  In Fig. below, what is the vky8fb ;)p-olx elocity at t = 4.0 s?

  In Fig. below, what is the velocity at t qhsh;fm (u2uwhb u2 /zzt; 8t rl/uz2-= 5.5 s?

  In Fig. below, what is the average velocity from 0 to d f(7.h gk01yk-ifubj 4.0 s?

  In Fig. below, what is nj8*xtdzi,x ( the average velocity from 0 to 6.0 s?

  In Fig. below, what is the acc/c -6ryzp,/yuc kanpzk m:3, aeleration at 1.0 s?

  In Fig. below, what j9-z4oz2 cxosis the acceleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0 i07 p9bn0h4go *, lgflkunx6w7tqq u,s?

  In Fig. below, what is the av0. duq; jk unts3tqgu-+k: 8gblif1 c*erage acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to h8zmruc/awpg e-6 s9z89p vs3 8.0 s?

Does a car speedometer measure spc85 .e g::mspz;koeps ei-b/u eed, velocity? {speed|velocity}

  An object can have a varying speed if its r ow;ry :xauo3od :81uvelocity is constant.

  The velocity of an object can be negative when its acceleration is posiz4m6r 0q( ss .9ojc)rdd qdu2stive.

  If one object has a greater speed than a)i06sbz g-3javb, c 3)hmtnoa second object, the first must have a greater aj 3zov)-m3i)acsa0h6 b,gnbtcceleration.

  Two cars emerge side by side from a tunnel. Car A i +:ovtla nxz-*s 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 spy 7qh.z56cyya+k gdl:eed as its acceleration decreases.

  A baseball player hits a foul ball straight up into rve: cn.y *g8ythe air. It leaves the bat with a sr*nce.v: 8y ygpeed 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 spee-ut*-w:yy j djds up, what is happening to its acceleration, how does ityd jy u-j:*w-t change if air friction is ignored?

  As a freely falling object speeds up, what is happening to e u4li8j utlc)2g5w7o its acceleration, how does it change if air friction2w 5ui8jg7loe)4 lut c CAN NOT be ignored?

  An object that is thrown vertically upward will returnk - ssy8.r:btr)v3 wls to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will tbvw8y s.:kt l-3srr)s his result be altered?

  An object can have zev o1) +aal8 lkr35fkaero velocity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero ab kpyh lo3i(c)suk;g0na8:dxv /oh*7 2 7mveocceleration at the same time.

  An elevator moving from the second floor t ,+mkix h 2.3)pfrrskea0g9jgo the fifth floor making no stops along the way has zero accelerrk0jgfmgha2 ei r )9,p.3x+ skation all the time.

  A rolling ball moves froh49(hl;siz r um $x_1=2.9 \mathrm{~cm}$ to $x_2=-7.4 \mathrm{~cm}$ during the time from $t_1=2.2 \mathrm{~s}$ to $t_2=5.0 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.2 \mathrm{~s}$ is at $x_1=3.2 \mathrm{~cm}$ and at $t_2=3.4 \mathrm{~s}$ is at $x_2=8.1 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps aroup,b -jxkz ,5-:mtm6 fjslc, esnd a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 9.0 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 (iy2nzyrk3 d ztk0aj7fh4)y 3lsm60 la straight line, moving 109 m away in 9.9 s. It then turns abruptly and gallops halfway back in 4.7 s. Calculate (a) its averyh krn)yda7fl60j4m iz 03tkz2ly 3(sage 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 froj8yuv7e u46pi si ,kd(m $10 \; m/s$ to $24 \; m/s$ in 5.8 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 from 6wn/rz/ e i a.)h9itav$17 \; m/s$ to rest in a distance of 79 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a sppkbcg 4w-x7* o43bac oeed of $25 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.1 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks tcwxx l +6ts8v)ml d6-,4cxn /den-nkn o essentially top speed abou)-dckn + s-ncvwx6/lt nd6e ml ,4xn8xt $10.5 \; m/s$ in the first 12.0 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 ob7lato 3hqvs o b9:9/uf $17 \; m/s$ to rest in 5.89 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 hssw0ck:4 5ul5ynay 4jighway. Assuming a decele c44:nwayku5l0ss jy5ration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truc5( (a/i yyrorhp t//6 z)kasprk 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).    $m$