Suppose that an object travels from one point in space to another. Make a com0i 3k am3i 4cs,n7jasuparison between the displacement and the distance trav34, 7muijs3kac nisa0eled.

  When is the average velocity of an object equal to the instantal5rq- .e xdob3neous velocity?

  A new car manufacturer advertises that ;5zg;oj e-q i6(lr4 ue)x tsbstheir car can go "from zero to sixty in 8 s". This biuses-;qo4tl6()xj5e;z g r is a description of

  An object moving in the +x axis experiences an ac*fsmrqe;; r v7celeration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x dirjf* 1+3xedi//ywolf.htp. n oection) begins to slow down as it approaches a traffic light. Make a statement concex / f p/d.w l+y31jnh*o.oietfrning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow downwuu/s ,h* c )4+cda r4ssvta+x as it approaches a traffic light. Make a statement concerning its accecv,hat c4 * d++su)xa4srws/uleration.

  Suppose that an object is moving with a constant velocity. Make a statemcc4dwb 9e,.h eent concernin4cw9c, ee.bhd g its acceleration.

  If the velocity of an object is zero, does it mean tha(oynfuf pn1l z38d lm,anx01;t the acceleration is zero? Support y1 lnudf0 f,n(1xa8; pyzm 3nloour answer with an example.

  Can an object's velocity change direction when its acc aka :0kw)zc0j tgv)u7eleration is constant? Support your answer k) g 7w0aaz:c)kvj t0uwith an example.

  Suppose that an object is movyn d491qq6xv ding with constant acceleration. Make a statement concerning its motion w6nxq4y9 ddqv 1ith respect to time.

  Can an object have increasing speed w 3g doir+:3ilj(q;eix hile its acceleration is decreasing? Support your answer with an example: +e qlgd3i3 (xrioji;.

  Suppose a can, after an initial kick, movzgcs 8 n7,/jhues up along a smooth hill of ice. Make a 8ncuz7 gjhs/,statement concerning its acceleration.

  Under what condition is average velocity equal to the average of the obeb gl3t0o791c9rmqi rject's initial and fin0it mr 1b39rco q97legal velocity?

  Objects A and B both startk6cmvx :yy+ 2/m;r1zi b4vmgoroo6u* at rest. They both accelerate at the same rate. However, kzo+ 2g vr16m6rxuoy m/yic*mvo:;b 4object A accelerates for twice the time 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 th+ weisx0v(mn0e same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by objecxsmvwi( +0 en0t A compared to that of object B?

  When an object is released from rest and fallsx6xa ai 3b+rr8np;f5 w7k3 gdj in the absence of friction, which of a i8jbgfxa;k prr563wd+7n3x the following is true concerning its motion?

  When an object is released from rest and falls in the absence of fri:nje,fp1w ;m vction, which of the following is twme;1v,jfn : prue concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about they 7d) malmr: uyj8(d3q velocity and the acceleration when the b (:mdy )url387qmjdayall reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just befor3;t-il ,cxv-0o ofobfh7n -tf e it rea0iofo7l o,;3xhn ftf- --cbtvches its highest point?

  Suppose a ball is thrown straight up, reaches a maximumb6s mrv--r q*pgrs/g ( height, then falls to its initial height. Make a statement about the g*- vrprrms -/qgs6(bdirection of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to ituiy8zhk;xa 8 xs. )4ous initial height. Make a statement about the direction of the veiu 8k . ax;uos4)yx8hzlocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Make z)/gse2 lfz ghmr7l-/jn ,qvxm 9l/2l a statement concerning its accg)/ ,gellx/ jlmr 2l29szmhf7z-nqv/eleration.

  Suppose a skydiver jumps from a high-flying plane. What is h0gmd4oiw8w9yi,kt -her acceleration when she she reaches terminal velo -g0mi h98dowyw4,kticity?

  A ball is thrown vertically upward with a speed v. Amsm 5ku9f;p /hn 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 os 5;fmmk9/uhpf the first ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped frow)vi1)r3gd *phpl s5l 8de a9lm the top of a building. One second later, ball B is dropped from the same building. As time progresses, the dista )vg lepi)dd8519pl3*rl swhance between them

  Ball A is dropped from the top of al.5ys/dwv8b.mc ilqo46q:s j building. One second later, ball B is dropped from the same buildic8il qsol5 .4yq/d bjmw6:vs. ng. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. d )qvrq47oqawbn; s6 0One is thrown up, and the other is thrown down, both with the d7b v w0nrqa)4 qq6o;ssame initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of acnq2 s( t3u/co 9qhu9j building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations (h9/qjuctnucqs92 3 oof the two bricks.

  An object is moving with constant non-zero veloci57 q czi+nvx ;rf1t8gbty in the +x axis. The position versus tibi1f5nz7 +tx 8r qvcg;me graph of this object is

  An object is moving with constant non 4n(t myoxhd2:-zero acceleration in the +x axis. The position versus time graph of this object i2to:(n 4y xdhms

  An object is moving with constant non-zm((o2g qxjbr 4ero velocity in the +x axis. The velocity versusob( grj2mx(q 4 time graph of this object is

  An object is moving with constant non-zero acceleration in the +x px i(4tcck 9 qjg/x6c9m8f)ad axis. The velocity versus time graph of this xk(p8j4i9c d q6tgcmf) /x c9aobject is

  The slope of a position versusug5icri+v5j 0 time graph gives

  The slope of a velocity versu 4d n+odmzd)z9mk ) fvfi;,v jg3nl,l6s time graph gives

  The area under a curve in an accelerat 5zhco3w 6 1uzoq7rqz(ion versus time graph gives

  The area under a curyj da3xqo 8+q(3*fewyve in a velocity versus time graph gives

  If the position versus time graph of an object is a horizontal line, t p+udpvlv 54-ghe object ig-lp+v5pv d4 us

  If the position versus time graph of an object is a vertical line, the object il;rbe6u uz85 js 8bu6;z5jul er

  If the velocity versus time d)zuubc42 :1 j pm(yhxgraph of an object is a horizontal line, the object is by 24 x:h1)jcd(mpuzu

  If the velocity versus time graph of an object is a straight line makingh5f v4fopp:gy. . x,g0dp3 dym an angle of 30 degrees wx 5p0.m4yp:.gp oyvd,fd3fgh ith the time axis, the object is

  An object moves 15.0 m nor )nsewnhi ub /t4e;yrpt ev,8,ql; v..th and then 11.0 m south. Find both the distance traveled and the magnitude of the displacement v.,pqt erhwtbnu,se)vl4iv8/ .e ;y;n ector.

  A boat can move at 30 km/h in still water. How long will it take e6yyiw/o02i(p1pw, ,f fw deeto move 12 km upstream in a river flowing 6 w /1e2ydy(ee 6i,fiw 0owpf,p.0 km/h?

  55 mi/h is how many mfskr/r*b)mb;e26xt w /s? (1 mi = 1609 m)

  What must be your average spew2tqw 6,s0wn8 xcx5ytwvrt9k4p j v4,ed in order to travel 350 km in 5.15 h?

  A runner ran the marathon*gx qoaevm+u17+b1-ecvkvs4 7xhw. w (approximately 42.0 km) in 2 hours and 57 min. What is the+ vg*7+oh.m 1 vqvbacu7ksww4-1xxee average speed of the runner in m/s?

  A car travels 90 km/h. How long 4gc tfgnfm1s6 7+a4 )lvg,lgpdoes it take for it to travel 400 km?

  A ly (light year) is the distance tpcta5i ycofe4 f0e2mk(db+* * hat light travels in one year. The speed of light 5 yieoec40ff *+a c(mdkt*b p2is $3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

  If you are driving 72 km/h alo8d ym8(e9hdym ng a straight road and you look to the side for 4.0 s, how far do you travel dur(y 8m9hdyed8ming this inattentive period?

  If you run a complete loop around gndng8ltz + od)4,yz (an outdoor track (400 m), in 100 s, your average velocityn,gz otn 8) dy4+zg(dl is

  A polar bear starts at the North Pole. x .2 jj( i,hmkw7dkum *5mk *arc)9oln It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its sta mkwdm(r, nuimhxlkcoaj*25k.97)j *rting 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, then 1.0.e7 vqs 0nd 4m6on97vpdp pz4a km east, then 1.0 km north, then 1.0 km west to return to its starting point. This tr v4p6s0n7 q79vdn pmoda.p4ez ip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from schoop(1s-u . ka8mbsry;ynl 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 minutes. How far is your hometown from school?u;p r (8bk-1s nmy.ays

  A motorist travels 160 km at 80 km/h and 160 kf rr onfvmt6 a-895-lpm at 100 km/h. What is the average spee98avf 6mptorl 5-n-fr d of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at i8-+fw.az(c. w ejlei 100 km/h. What is her average speed for the triei lf-.iz .waj8( w+cep?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h no0 q hl8npeas;(q*o1z wrth for 750 miles. What is th ne 8z(o1hqwasq0 *;ple average speed for the trip?

  In a 400-m relay race the anchorman (the person vos.abbch 5v, :r*(v gwho 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 team A runner starts the final leg of the race, in order that the team A runner not losearcgbsv:o vv(5 .,*bh the race?

  A car decelerates uniformly and comes to a stop after 13 s. The car's average vu,:h7j) co4 z d;e2l1cwddy gxda-kd3 elocity during deceleration wcdxd ydk:g2 jz3d -;dch1 lw,74 )oueaas 42 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/sg kj cj14oeqm ;2ku+n1, at the average rate of ceg 2 qj1 1onku4j;km+$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at t0yfa/2o)7tglbiyp3p;wks m 38-0 1i c fwhowzhe 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 accelerate4vbe8a kk5+ps s 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. It6xbay3r2 b l*w then speeds up with a constant acceleratiob *6ax 32wylrbn of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velo/;qald50 awzo city of 5.7 m/s experiences a constant acceleration of oa5;qdza /w l0$1.7 \; m/s^2$. What is the cart's displacement during the first 4.2 s of its motion?

  A bullet moving horizontally to the right (+x direction9)f ;br4qvs, jch*p sv) with a speed of 387 m/s strikes a sandbag and penetrates a distance of 50.61 cm. What is the average acceleratif;vv),*9shrsjc4 bqp on, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from 8 x8zu5 j adumk-z+e,xa catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant-j zkx85eum+ x,du az8, what is the length of the catapult?

  A car starting from rest moves with ,h7ibfcwudl- , ;kxx2constant 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 distannoe l21j v8n01i utpn+ce of 200 m. What is its average acceleration? 2+8ipnnnu1 1 ejol0vt

  An object starts from rest and undergoes uniform accelety 2en l i1yfz.b:r+e/ration. During the first second it 2yz1+:. nf rte/ybil etravels 8.9 m. How far will it travel during the third second?

  An object is moving in a straight line w 4bft;m:e zpl-yhk) b1p l)so.ith constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. Howb).z kly1mblte :-pp4 fs o)h; far does it move during this time?

  A car starts from rest 5fh25wm zj0 raand 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 tire5nciqgub hn9.+ 3trwr9r1q ywe w30d /s 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, a car that has been waiting atle/laom)iy jm i 8fm0:e,;1.pwnzq c 6 the intersection smzifqn06 a /e jmll)m 8;cowey:i,.p1tarts 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 of 12 m/s on the surewd-+3 q(wm vh)jrnd *face of planet X where the acceleration due to gravi-r w+dqh we(*3j mvn)dty is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward witu.t1 ut/h vm(/b1s2py,nzc vnh a speed of 12 m/s on the surface of planet X where the acceleration due to11py/h,tm.t vs2/n uvz ub( cn 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 ki3 gz( pas 0e33;kq0tjrhil,of planet X where the acceleratk igl ri 0ze;3t0s(3,q phaj3kion 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 speed of 14 m/s on the surface3yku *4ms ja-l of planet X where the acceleration du 3lsu- a4m*jyke 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 than 0.10 s. If yourcbykxhn.gm om( f8 *wu5j/us 5w *4sd2 friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you catch it?.jfudn hs2m4/g( ckx85u ym5w*obsw*

  A ball is thrown upward at a velocivxd0b1o6g *a 4rqg:e,t8 tqc sty of 19.6 m/s. What is its velocity after 3 b6ax4 sdgo *erq vg8q:tt,01c.00 s?

  A bullet shot straight up zl./*w ljt /wqreturns to its starting point in 12 s. What is the initial speed of .wtl *qzj/ wl/the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it )na2fdb2mf vm3 7hy9ftake to return to its st2h abfv2 97m3 fdn)myfarting point?

  A ball is thrown downward from the top of a building kdc;d6xd4wngt j/d 33with an initial speed of 15 m/s. It strj3x;tk3d d/gdd6c w4n ikes the ground after 6.8 s. How high is the building?

  A ball is thrown straigx8rvsdh7+l v 3zswrq n -6rc8*ht up with a speed of 30 m/s. (only fill in numerical value in the bla7rqdx rw cs8 v+rlnv3-h*8sz6nks)
(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 y)ylmo3bsrjx5l m283the air with a speed of 45.7 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 1 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 13 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 13.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what i 5qkbgv x-;0,vpnow3c bgyd;,s the velocity at t = 1.0 s?

  In Fig. below, what is the velocilg.4y ypzl7 .ity at t = 2.5 s?

  In Fig. below, what is the./v+;za yg. bk :dmafj velocity at t = 4.0 s?

  In Fig. below, what is the velocity atlc0 ujt f6dpum* lb2gci*b;64 t = 5.5 s?

  In Fig. below, what is6w/hxg2o+po 7t - wgiw the average velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity frokte;u, ozi:m 7 h51 jxlfj6y)am 0 to 6.0 s?

  In Fig. below, what is thqxw 1 ojv+w-,vbnnrvxa 5 b9.6e acceleration at 1.0 s?

  In Fig. below, what is the accelera zmgczox1 - xymhcw-4s*x6y28 tion at 3.0 s?

  In Fig. below, what is thebe6l6gwgrgi .9y7 mu+ average acceleration from 0 to 5.0 s?

  In Fig. below, what is the a5ic,np2 1tw l/xpi7(zd .eqa01wummke 7 3yauverage acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 5*4:eq-lhtn e o ixfi4to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|velocity.h6sjs 3kp zj-}

  An object can have a varying 7+e5p /sk:zg kg bypx/speed if its velocity is constant.

  The velocity of an object caaj:q63o g qp1en be negative when its acceleration is positive.

  If one object has a greater speknfu,b36cld. ht. y,ved than a second object, the first must have a greater accelefk.,,vh .dc ynlt3bu6 ration.

  Two cars emerge side by side from a tunnel. Car A is traveling with a spz71 v,c.mhg w9bllnc1 eed 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 ij yl7pre+, a8s/bgy0bgr7.kk n speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into t ) cvdnuyamum n0s-b,t/ :+/ebhe air. It leaves the bat with a spee /y0tc:b m) nad m+vsun-u/eb,d 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, whaxkyb*sdf 91b7 wqw(9s t is happening to its acceleration, how does it change if air friction is 7 bbww91x fy9kqd(ss* ignored?

  As a freely falling object speeds up, what is happening to its acceleratwybv; 4/omzed - 7agnhc g.;j-ion, how does it change if air friction CAN NOT be igvejg7mb . c gd4; w-zy-h;/noanored?

  An object that is thrown vertically upwai7s0+vzxlotq ( kslpm9.,uz 1rd will return to its original position with the same speed as it had initially if ,1mx.u ki7ql+s(zpt l09 ozvs air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velp(w:(hkb/j fq ocity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration atlq:lcmq; 04bk *8 avyu;4vv fp the same time.

  An elevator moving from the second floor to tp3 i:h .,xch+nlcv 4n50f9)itdgeqt hhe fifth floor making no stops along the t:x,t0 nqpi3+ed l) ih4 v5hgc9 .nfchway has zero acceleration all the time.

  A rolling ball moves frkba0:k:ts dj08p q:fgom $x_1=2.2 \mathrm{~cm}$ to $x_2=-5.5 \mathrm{~cm}$ during the time from $t_1=2.6 \mathrm{~s}$ to $t_2=5.3 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.5 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=4.0 \mathrm{~s}$ is at $x_2=7.6 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a qua4.ltx yv 7xd6c6m+.8uia(q t h-rfwfarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 11.5 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, alc9 s6ecfx811f cy7u moving 98 m away in 13.2 s. It then turns abruptly and gallops halfway back in 4.8 s. Calculate (a) 7 a9esyfu681fcl1 ccx 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 from tw /v7lry ge- ots3g6*$11 \; m/s$ to $23 \; m/s$ 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 from apiv9ve02c-(.) wtg nvdea foa 6h58b$16 \; m/s$ to rest in a distance of 58 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a splkexxw+a53 0kc*7 wjay e1i u y:m;:kzeed of $31 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.5 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blockrsegrb3ml0 2rs: *ln 6s to essentially top speed aboutlb0n2 3*s6lmgre rsr : $10.3 \; m/s$ in the first 14.4 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 speed of q,8ju *g93kx b9yrejd$18 \; m/s$ to rest in 5.08 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a cax;tkl2 9: 9c8i xkuwusr leaves skid marks 92 m long on the highway. Assuming a deix9suw92tuk8;k: xc lceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trtbr)d8g0b o m)q1-ug wuck 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).    $m$