Suppose that an object travels frefpq 38zter30i ap-wbs2*bu2l*dp u/ om one point in space to another. Make a comparison between the displacement and the distance trqetwi-s8p 3u*ua/fl3202zbbd erp p * aveled.

  When is the average velocity of an object equal to the inmggi+e ev3 8,-i rqm-4we+uptstantaneous velocity?

  A new car manufacturer advertis*l7opw ny/z0 jes that their car can go "from zero to sixty in 8 s". This is a descriptinj /olw0*yz7pon of

  An object moving in the +x axis experi.4g 2-p -a *ym6uxsrvzl0 +ztwp;l,alcx n1emences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car trav lms- i1tnfgk:43.h4g jvt 0rneling to the East (+x direction) begins to slow down as it approaches a traffic light. Mgt.0 4tr4nm k vfl-g1hs:3nijake a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins t r g+of( e1wj/ctfzrxy*+ w-)71h yprorw.w*y o slow down as it approaches a traffic epx+r. tgwy1zw*y worj( f/yh 17o )*frr+-wclight. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocitqc , afo*5kfj2v)bx x8y. Make a statement concerning fj , o2q)bxfk*5a8xv cits acceleration.

  If the velocity of an vt:eftqotoq0d: upj5,3h5 ,e object is zero, does it mean that the acceleration is zero? Support your answer with an example.t,h:,5tevod0 e: uq53fp qtjo

  Can an object's velocity change direction when its acceleration is con6 a*f:wfk y/4f 5mvykxstant? Support your answer with an examp5:fkfky/m*wa xyvf46 le.

  Suppose that an objeq*cd+6b ml*xwct is moving with constant acceleration. Make a statement concerning its molc*xbq+w 6md *tion with respect to time.

  Can an object have increasing speed while its acceleration is decreasing? S-djspjr du; .*upport your answer -j.djsru;* pd with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ndk+,k eywn8;* ewy o09verr(ice. Make a sw08nd+n*y9(ewyr ek krvo ,e;tatement concerning its acceleration.

  Under what condition is average velocity equal me4/ b4wj) fupto the average of the object's initial and finjf m4e)pbw/ u4al velocity?

  Objects A and B both start at rest. They bothz/dixs ;xfn,sc v 4 )u;brdh)-o ww/x7 accelerate at the same rate. However, object A accelerates for twice the tzxnh),o)fv-r 7/c/sx swxd 4dw;ib; uime as 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 sam.zjv5v xha2)m e rate. However, objecth2j5) mvxz v.a A accelerates for twice 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 inwx6 vrk*27w+zg /3o xq;e oqdn the absence of friction, which of the3 g*xqrv q+2kenwowz / x7o;d6 following is true concerning its motion?

  When an object is released from rest and falls in the absence of frictie.3e h1jldy:jdhp n19 on, which of the follnp119eddh j3jeh.yl: owing is true concerning its motion?

  Suppose a ball is thrown straight up. Mtxdl;9q8 s xt46vbeem t9/8xwake a statement about the velocity and the acceler xed9 wm6e4x/; s8b9t tvtq8xlation when the ball reaches the highest point.

  Suppose a ball is thrown stra59t w7cjmiv h7vrbpdr1k.51aight up. What is its acceleration just before it reaches its highetavv7b jphrk.1w 755 i19r mdcst point?

  Suppose a ball is thrown straight up, reaches a maximum hei 5xf076xyrbq)klu /foght, then falls to its initial height. Make a statement about br7/xy5 xl6q)ku ffo0the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maxi; - qnj3ozvq3mmum height, then falls to its initial height. Make a statement about t-j3; v3zo qmqnhe direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Mak t;h0gst) ae7r/dbx5xp 1lgm 1e a statement con m)d5pter/gl1hgxxa; st7 10bcerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her acceleration wq.) x d5npuvk.hen she shed np5v qxuk.). reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. ai;wa2l(z)p hrg g o91 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 ball? (How many times higher;g loh9)z1pi ar2(wga does the second ball go than the first ball?)

  Ball A is dropped from tm k-0 cbhn 6b2id)(rrnhe top of a building. One second later, ball B is dropped from thrn rn (0cmk- )bd2i6hbe same building. As time progresses, the distance between them

  Ball A is dropped frob woasi-w9 o6.m the top of a building. One second later, ball B is dropped frombsoi9ow6.a- w the same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. ) qh,(w,olsi h+aspd yjz,.q)m;ciu 7 One is thrown up, and the other swz,yi,.)()so, d cmj7hq auq;ip lh+is 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 thrown s9rj3hfw y qd2,traight down from the same building. They are releas9hrwf,d yjq32ed at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zer4odd6mr0qkc8o i1a7a o velocity in the +x axis. The position versus time graph of this obq04 a8ca1dokomi6 dr7 ject is

  An object is moving yjcfld4 k-m*a3nmu).5 s 2qaowith constant non-zero acceleration in the +x axis. The position v3 5s.ydjmq cn2a-) *ulk4maofersus time graph of this object is

  An object is moving wi kakg)6do l,f.dq8x+ //; qluwynxkn-th constant non-zero velocity in the +x axis. The velocity versus time graqkl 6x aondnyk fu/d; l8/,)-+g.wkq xph of this object is

  An object is moving with constant non-zero accelertu-ll2hsvul0,t v 6)iation in the +x axis. The velocity versus time graph of this objecti tu ll6v, -u0tvl)sh2 is

  The slope of a position versus time graph gives/u jfftq wf nr-;/df,:

  The slope of a velocity versus time grap2; x d5ippgdu2k.a(ub. wl9tvh gives

  The area under a curve in an acceleration versus time 85wtdbl+o3gt2 zxwu/ 6-r osugraph gives

  The area under a curve in a velocity vep-6+x+k 8smrxz/5lwx vsl e)rrsus time graph gives

  If the position versus time graph of x. nn2j,pug24azt ls.9q q/xwan object is a horizontal line, the object ixwxs,/l.qn4p9ut 2n2qja.zg s

  If the position versus time gre t /qkjz:9q(rgw5ix(aph of an object is a vertical line, the object isw5iezkq j x t(q:9g(r/

  If the velocity versus tijyb,k(flp 5m 5unzw4g .2ld2ime graph of an object is a horizontal line, the object izy 4pwl5k.m jldn2ui,2 gbf 5(s

  If the velocity versus time graph of an objzosx( ifz+p 7iu:;kj -q7 qhh(ect is a straight line making an angle of 30 degrjxzui+po h-;q:ik fh(q( sz77ees with the time axis, the object is

  An object moves 15.0 m north and then 11.zukl/:bi c.4p7 tgy 3p0 m south. Find both the distance traveled and th /t7ipzgybpu3k4: .lce magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to move 12 ,-vuxrtsal-qn .l asp6j,e*+ )b:r cmkm 6sv,+lj rp q-),bxt-.cm:un sraeal* upstream in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (qh /*r/s.ugk v0 4tyoo1 mi = 1609 m)

  What must be your average speed in order to travel 1a;v9w fqp tb8.3c6s r61 uug-mo lbzf350 km in 5.15 h?

  A runner ran the marathon (approxima)so)v(g,xmrc, d :w / bfingr70:s pvptely 42.0 km) in 2 hours and 57 min. What is the average speed of the runner in m/s fc/m w n7(vvdsi)og:,ps0) bxgrp:r,?

  A car travels 90 km/h. How long does it 3tw g4;xgd,qt take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. : aykal: man0ua (9,vfThe speed of light is fm k:ay(a9 ualn v,:a0$3.00 \times 10^8 \; m/s$. 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 straighthh vb0kz )xa7da/y-( kb3fky8b :pbm9 xo.4uv road and you look to the side for 4.0 s, how far do you travel during this inattent4ofbybz ha):0mx7v abk-h8 bkup/d9x3(k yv. ive period?

  If you run a complete loop aerkct4)o me,8 round an outdoor track (400 m), in 100 s, your average veloccrt4me )ke o8,ity is

  A polar bear starts at the North Pole. It travels 1.0 km sou4ym1u3wzz d:b qr6py6xl 2qm3th, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its yd6zwuq 3 qm2lrmx z31:4bp y6starting 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 south4+ agr9b gz/jx, 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 v/g4+bg 9 raxzjelocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles. It sd 7ca j3:5hs8cbiib6 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 from5cs h6ca7 s:3ijbd i8b school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. Wha8akn82flvo /at is the average speed of lka8/n2o f a8vthe motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 101pszdt42 ijmtzn1 /dd+5 -b pv0 km/h. What is her averag tzv1tzd+b/p sp 1d-52 dmjni4e speed for the trip?

  An airplane travels at 300 mi/h sout4 +k/* a k;e3eosagubph for 2.00 h and then at 250 mi/h north for s/a + ab4k;pkueeog*3750 miles. What is the average speed for the trip?

  In a 400-m relay race the anc* q7c9q6lvp:og qee2e 3sxhn8horman (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 te8:3xh p2q6osqlq7ge9 cve*n e am A runner starts the final leg of the race, in order that the team A runner not lose the race?

  A car decelerates uniformly kl 2p1-bro sg06 r;ieqand comes to a stop after 9 s. The car's average velocity during decelerato k-gebq2 0ls1i6;prrion was 51 km/h. What was the car's deceleration while slowing down?

  An airplane increases it )2k.)z 5ph6 y2;patlxowu( tn9zgrbd s speed from 100 m/s to 160 m/s, at the average rate of zg 6.2 oxp;ptru)w()ztn 5 2hyblda 9k$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acceleraah ,i/u ,z0tgis21f,.icj yyc tes 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 resa6tcur7b b5 3k i(.uoyt and accelerates 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/s4 )gn )ehvsm sp5d:v,s for 10 s. It then speeds up with a constant acceleratio )se):mss ,gpn5vvh d4n 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 5.4 m/s experiences a ukr6+ qj 7mjku9qx*kexonaw */h0w(6 constant acceleration of*xnuq96x u/ 0(m 6kaqhr7ej o+kk* wwj $3.4 \; m/s^2$. What is the cart's displacement during the first 5.7 s of its motion?

  A bullet moving horizontally to the right (+ya.7q xq5(a msx direction) with a speed of 422 m/s strikes a sandbag and penetrates a distance of7q5s aqm.xay ( 25.81 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft c 4cl 6f .l7x,fpac*w3ggd bzgeu;m7;farrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is co*d 6 wxzaf4.;;c7ggmlbcl 3gf,7upe fnstant, what is the length of the catapult?

  A car starting from rest moveszu r2 sv+4/xgh with 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 distance of 200 m. ke/twf:. .f(,x f3f t+ fpfvozWhat is its average acceleration.f. v(f f3tp zt/xof+,fe:kwf ?

  An object starts from rest and undergoes uniform acceyf tdzw080 o+sleration. During the first second it twf o tz0y08d+sravels 3.8 m. How far will it travel during the third second?

  An object is moving in a straight line with constant b(h1qn f-z :sshxz3/:yipy(kd b) c:sacceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How fax3 /y: qsdzk()z :bh(b1sifyh:c np-sr does it move during this time?

  A car starts from rest1vthda i+3q / mnm2z4t and 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 decelerate at about 7mzm+4.bgs)dgv 6 eid$5.0 \; m/s^2$ 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 traffi zf(xix+ w:er/c light turns green, a car that has been waiting at the intersection starts ahead with a rx/x+we:zi(f 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 planet X w /6 nla,4i4 7zq k0vogk1ikxbyhere the 1k/z6a44,kn ik07 q gibyolxvacceleration 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 sur/rwbm6 - bryd4face of planet X where the acceleration d/ d6r4-m ybbwrue 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 withsi5 *f9 ymnjl1k xzd+8 a speed of 15 m/s on the surface of planet X where the accelerat +f9lmx*jy dknz 8s15iion 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 upwarv qg;xmz+::m kd with a speed of 14 m/s on the surface of planet X where the acceler+q;zgmvkx: :mation due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time qk0tc19t;hmr 2squ d3zo)y0q is usually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the r c9z;0)0k23oqyrtuhqts 1 d mquler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is i97yy6 yn5h2q )fmmptsts velocity after 3.00h t)59sm6q yn p72yymf s?

  A bullet shot straight up return2hq27ldj. u nes to its starting point in 19 s. What is the inu2d7en.hq jl2itial speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. Hq b :k,dxjxka63m7x5 low long does it take to return to its starting point 7l:k3mxj,k5b6dxxqa ?

  A ball is thrown downward from the top of ailpslh y(xh(5zc13ai d3 yh,+ building with an initial speed of 12 m/s. It strikes the ground adh3cyp+ a 5ys, l3h((zi1ihlx fter 4.6 s. How high is the building?

  A ball is thrown straight up hg- tif(rjrs3a4pm8., zkcr: with a speed of 30 m/s. (only fill in numerical value in as.f,k :38rmthj(cz4rr-gpi 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 the air with a speed of 22.8 4a9zm)g 1q gviyq .qt::fr1oum/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 3 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 i xkp,y/,u nrh4s the velocity at t = 1.0 s?

  In Fig. below, what is the velocity qxk+g3g ,m* nlat t = 2.5 s?

  In Fig. below, what is the vepr l*a-eyca116c yc43en qg(ln q)m5l locity at t = 4.0 s?

  In Fig. below, what is the velocity at t 0+pm n mfiortg; d8)rgcn71* qzlch13= 5.5 s?

  In Fig. below, what is the a9 n6- )buajhirverage velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity fr; nb 3 :yibpo-:ip3tdrom 0 to 6.0 s?

  In Fig. below, what is the acceleration at 7 s:o.fvicrk-1.0 s?

  In Fig. below, what is the accelerationokdzb: o a r64*.dpq+wu4kf1a at 3.0 s?

  In Fig. below, what is the average acceleratz6njgm),45;h e h cvj r4xjiz;ion from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 tos:rqg0wr. h :ho g+;jx 8.0 s?

  In Fig. below, what is tw5a,-y8n ;b8 8uwbk pqr3h6x8ttxr x ghe displacement from 0 to 8.0 s?

Does a car speedomet*f*jolll*u9p er measure speed, velocity? {speed|velocity}

  An object can have a varying speed if its velocity i;yfxb/g/8edc+vrx4 heql k33 l 80kdts constant.

  The velocity of an object( 6vbjak ar;y0 can be negative when its acceleration is positive.

  If one object has a greater speed than a second object, the first mu 2:z xoz0fv1yrst have a greatez ro21:v0f yzxr acceleration.

  Two cars emerge side by side from a tunnel.6 md5u9 fu gd2.inc4k(kve*gz1+ xvnn 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 az+rsk+pgexw:u b q2j0z 1/bw *s its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It rmlc9: l 0q4uvleaves the bat with a speed ofr4uml 0v9q: lc $120 \; km/h$. 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 hapkolra; mkr cxb). /y/,pening to its acceleration, how does it chanrkr.mx y,/aklb c)/;o ge if air friction is ignored?

  As a freely falling object speeds up, what is ha r +k5 kb,m -.)f)kk+ mdd(ilczm4rm-:qkp dnvppening to its acceleration, how does it change ifd5v,+zb-n d fkk m) dk:pqcl-.m(rrk+k 4 mmi) air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original posy ofo7u(b.m+pjus+a ,ition with the same speed as it had initially if air resistance is negligible. If air resistancem,+u f bp7a jsou.(oy+ is appreciable, how will this result be altered?

  An object can have zero velhpd(7za:8li eocity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the same timeket6/lsems ; ehh17n,.

  An elevator moving from the second floor to the fiftbd ko7m5zd(,p h floor making no stops along the way (b7 zd5,mkpdo has zero acceleration all the time.

  A rolling ball moves fr7 p :igxn p95np 4rl2k6ziqe89:drsdv om $x_1=1.9 \mathrm{~cm}$ to $x_2=-7.4 \mathrm{~cm}$ during the time from $t_1=1.2 \mathrm{~s}$ to $t_2=6.1 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.1 \mathrm{~s}$ is at $x_1=2.5 \mathrm{~cm}$ and at $t_2=4.1 \mathrm{~s}$ 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 quapszw+2wgabf,- /9pz qrter-mile ($1 \; mile = 1609 \; m$) track in a total time of 10.2 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 115 m aw;+n+m,rvtlr 95n 9 oij lf8lhkay in 10.7 s. It then turns abruptly and gal ;+io8lrlln 5 hmnt9kfv,j+r9lops halfway back in 4.5 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 fromcste5l j2euj 66m+8)sul sb i4 $12 \; m/s$ to $22 \; m/s$ in 5.9 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 nsh q2n/v.og1bi2w;f y pj99fm $17 \; m/s$ to rest in a distance of 64 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach gwx 8*2jcpz(n a speed of $29 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $3.0 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter cg6ara 9glus,82w4m jxan burst out of the blocks to essentially top speed about rg u l6mw9s x4,aaj8g2$10.8 \; m/s$ in the first 12.4 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 spl/n n1q kfr;h/ywx* w6eed of $21 \; m/s$ to rest in 4.70 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid m9pjn (q5y mjd-ik.v4y:o1ait arks 92 m long on the highway. Assuming a deceleration of tyii:j.jd (-y41vm nqka9o 5p$7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck (:znnw i;l:nqxp3rg2 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).    $m$