Suppose that an object travels from one point in space to another. Make 2yj)8fyfp+h xw7* oty 5el9mv a compariyoje 7lf+xpv 5y9*y8h2w tm f)son between the displacement and the distance traveled.

  When is the average veg3ac1ive q -yt*is00/:t y eumlocity of an object equal to the instantaneous velocity?

  A new car manufacturer adverqgms-v7jxu34 s 0leew a-36yf tises that their car can go "from zero to sixty in 8 s". This is a descry 0jl7ve3w f3es 6-uqm 4ax-sgiption of

  An object moving in the d9qo(nr94nujexw) s9+x axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) bew vbtc;f5a *em ;ke-g:gins to slow down as it approaches a traffic light. Make a statement concerning its accel* ;k5m-ftwveb:c e ag;eration.

  Suppose that a car traveling to the West (-x direction) begins to slow do juz2mgsl(n 3/ v :ne*46anz anze,)vjwn as it approaches a traffic light. Make a statemevs* nzuv34gz :()a/n 6e2nzae jmljn ,nt concerning its acceleration.

  Suppose that an object is moving with a constant vx k:dtb:ij * 65+kqwvbkk m.3delocity. Make a statement concerning its acceleratkd m+. 5qvkjt3kwdbb 6 :ixk:*ion.

  If the velocity of an object is zero, does it mla h,u. -6chfcean that the acceleration is zero? Support your answer with -cfah6hu.c l ,an example.

  Can an object's velocity change directiv-qqpeqf 71g 7on when its acceleration is constant? Suppog-v17qe7 pqf qrt your answer with an example.

  Suppose that an object is moving with constant a5f /rwqc;80 uo0ljjwfi bbi7 *f 1+cqacceleration. Make a statement concerning its motion with respect to tql 5j1+bfb * aciwfwj ;rio0 qf/u7c80ime.

  Can an object have increasing speed while its acceleration is decreasing? xu -.tcvvn4swl-uevc5 (0 r1 rSupport your answer witvwvx -n(r rcs 0 -v1uu4lec5.th an example.

  Suppose a can, after an initial kick, moves up alonaz n1/x; 2rgyodq+w z4d6x8 eng a smooth hill of ice. Make a s2qe;y x4z68n gx o+ dwdzrn1/atatement concerning its acceleration.

  Under what condition is aver. ovcuko2eox v(i;r)0age velocity equal to the average of the object's initial and final vel)( xoc0uk vo2;vier.oocity?

  Objects A and B both start at rest. They bothyccr4 5uwbgl-k5c*q8 accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A c*c5cc -klq8yrwu4 b5gompared to that of object B?

  Objects A and B both start from rest. They both gn ob l2jl 8xtty(fddvx6 ;x6jjn 0j;1cfv*/- accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of object Byl-* f xndjvxo(jjx8c bft1nvgd;6j/ 2;06t l?

  When an object is releasmh ref9*z)iz)ys4u o4 ed from rest and falls in the absence of friction, which of the following is true concerning itsyzhzfu i4*r9m4o))e s motion?

  When an object is released from rest and falls in the absence of frictioni; 3piy0mvi: s, which of the followingi iim: y;3s0pv is true concerning its motion?

  Suppose a ball is thrown straight up. Make402asx e b;nbx zgl)ovy ngavl448w; , a statement about the velocity and the acceleration when the ba ,;al4428 n b0;sgxyl ave x4)bvzgownll reaches the highest point.

  Suppose a ball is thr9+ jxs+tdmjy+own straight up. What is its acceleration just before it reaches jjm9 t+yxsd ++its highest point?

  Suppose a ball is thrown straight up, reaches a m7 1l metf+vg.awm dd(*)ry+ thaximum height, then falls to its initialfwr)mv1d *t.lya7 +m(g+ thde height. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to its ini lh(7(lvhuq1r5 9mp)o.pd kk ntial height. Make a statement about the direction of the velocity and acceleratimpov 5kph1l.u7rh dl)9 n (kq(on as the ball is coming down.

  Suppose a ball is thrown downward 7 d+1 ht lci3ylbew44xin the absence of air resistance. Make a statement concerning its a hly4wixc ed14 t+7l3bcceleration.

  Suppose a skydiver jumps from a high-fly3 kungf9tuihk986f2 hing plane. What is her acceleration when she sh9 i2g 6f9kk83huutnfhe reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An i9v )wl/fn ,*; w:nefi i3ylwtql *w8wwdentical 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 t; e*fti8wf,wwqlw:/ ll 3n*wvn)yi9what 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 later, ball B is dah;4 mejmjkwd;a e)6th2zp8/ sv5r e)ropped from the same building. As time progresses, the dist a jmzhj)/v )24 eesh5kdt8m;;p6aw reance between them

  Ball A is dropped from the top7pd/g-pyparsep 3 59w of a building. One second later, ball B is dropped from the same building.y-3 rsw 9 p5/app7pgde As time progresses, the difference in their speeds

  Two objects are thrown from the toe+cw/98yq oarp of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speed9 +re/c oywaq8s when they hit the street?

  A brick is dropped from the top of a building. A second brick is throwixbs5 y8. nulxw ah72/*kt8z pn straight down from the same building. They are released at the same time. Neglect air resistance. Compare 28wsy5n/izh ta7*.bxuxl k 8p the accelerations of the two bricks.

  An object is moving with o bj bkg9+d 5.o0gc19 ptow49rc 8hhyoconstant non-zero velocity in the +x axis. The position versus time graph ofj40ocoho g 9bhkt8+wc 59 oygb91.pdr this object is

  An object is moving with constant non-zero acceleration in the +xn.3l:b /wil pa axis. The position versus time graph of this w3/ :ilpl.a bnobject is

  An object is moving with constant non-zero velk7 dp/-pn bq3bocity in the +x axis. The velocity versus time graph k7qdp b3/bpn- of this object is

  An object is moving w9art) p/n6awo e4e:smith constant non-zero acceleration in the +x axis. The velocity versus time graph of thmpe )6s/ona a9:e4wt ris object is

  The slope of a position versus time gra xwrrp0m.ew/ -ph gives

  The slope of a velocity versus time hx6;mlg: w.yz graph gives

  The area under a curve in an accelgl m bow s2kc9o:2q sf-.d.h.oeration versus time graph gives

  The area under a curve in a velocity versus time graprg um.41py a(e-h4jnqh gives

  If the position versus time graph of an object isozem9oyq /)eh5. .cip a horizontal line, the object qc e)9imezpo/.y5 o.his

  If the position versus time graph olo;i.ij- j9ly: nk(g8k41fxccxwmd8 f an object is a vertical line, the object isim8dc klic4xyjk g;n.f-w(x8j9o:l 1

  If the velocity versus timezf6)k sea ; (zf9w-*zds ww syo(rub*1 graph of an object is a horizontal line, the object f fwyzaokb9((s1s*wrz6u )* z;wsd-eis

  If the velocity versus time graph of an object is a straight line making an angl.a vg18jy2pu ie of 30 degrees with thy gu avjp12i8.e time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the d r6eukgd+b,h,qv+a8/y a 0sitistance traveled and the magnisie6ag,dut, /ba 0hy8 kr+v+qtude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will l ijyr5pm.,r*i2z-a x it take to move 12 km upstream in a river flowing 6.0 * m pj,- liz5rr.ayx2ikm/h?

  55 mi/h is how many m/s r3movyr928sj ? (1 mi = 1609 m)

  What must be your average speed in otw 3d,l 5p h2a7kh56da rjgp/lrder to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. What i/:ya28syk3b:jsmwg q +j)cck s ty3:cw:ka /q)+jgs2 jb cykms8he average speed of the runner in m/s?

  A car travels 90 km/h. How long does it take f hx xh53q(d s2h4u1zpoor it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. i6oe8cag16 ms The speed of light isa i6s1go8emc 6 $3.00 \times 10^8 \; m/s$. 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 straight road anduip*1h 2ze i2h you look to the side for 4.0 s, how far do you traveeuz2*i1hih 2p l during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 /hefw8c6 j 9eos, your average velocc9wef h8 o/je6ity is

  A polar bear starts at the North Pole. It travels 1.0 km southni vxr8sx/1+s/n-dw l , 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 w8 sr+x1il nvxd/s-n/speed?

  A polar bear starts at the North Po u-vq0 grm+x;89zkbuy le. 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 starting point. This trip takes 45 min. What was the bear's avez;k9 0byu+ m-r8qx ugvrage velocity?

  You are driving home on a weekend f 3.;q9h tbuqksrom 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 hostqh b u.q3k9;urs 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 the averag mhdz),j9:nk7z 7jag le speedakz, : g7mnd9) jjh7lz of the motorist for this trip?

  A motorist travels for 3.0 3f:f;pbapa8 *eanpt) h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for thpn)fbepapa8 f;3t *a: e trip?

  An airplane travels at 300 mi/h south for 2.00 h and then atu+gz:coop 8 ,c5;d cehdi;ky , 250 mi/h north for 750 miles. What is the average speed for ;dk5gecc,8 zh:,o;p+o duyc ithe trip?

  In a 400-m relay race the anchorman :3+:intfdosv cm( h2w(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 team A runner starts the final leg of the race, i:nf2viw(to3d +m c:h sn order that the team A runner not lose the race?

  A car decelerates uniformly anr13h e.smvo(gd comes to a stop after 13 s. The car's average velocity during deceleration was 76 km/h. What was the car's deceleration whilvher.m3 (ogs 1e slowing down?

  An airplane increases its speed fqj(c.a i(w7qi rom 100 m/s to 160 m/s, at the average rate of 7ci(wiqjaq(. $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates abil2: c z.g1qvz/s8wit 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 acceleudrz p4emz,s/yj4 kq +-*2t lmrates 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 with a conee fsz 1 ;dew5qfcrqa.r0-/z/stant acceleration of sdz0r/wf .- ea;crfz e1 /qeq5$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 5.8 m/s experiences a constant aco eg+;*(psivk celeration of;i(geso+p vk* $2.5 \; m/s^2$. What is the cart's displacement during the first 8.6 s of its motion?

  A bullet moving horizontally v,mvbcs-*+qwokaic , uepd3k68o9p tc8+3 xi to the right (+x direction) with a speed of 362 m/s strikes a sandbag and penetrates a dist3ad8ms-+ oeccvc 8kp wqi9u36*xb,t+pki vo ,ance of 86.97 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a cahxz o ww3 57hfegwj001mo-v:i tapult on an aircraft carrier. It reaches a z1 3w fm -0h 7:jo5hev0wwixgospeed 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 with0)pxbm6 -0zw1 ka skf,7vt ukw 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. What is its avxo p,6 pzc9g-:dodem;erage accd-, g o me;o6:dpzpc9xeleration?

  An object starts from rest and undergoes uniform acceleration. During 98 k mtz(:emvbthe first second it travels 9.4 mmbk9e :8mztv (. How far will it travel during the third second?

  An object is moving in a straight line wit w9ksg01c kmaawhn45 xt)t :2hh 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 tn) t9hha5:t4kscm k aw 2x01gwhis time?

  A car starts from rest and accelerates uniformly e0of s+fd4l6 oat $3.0 \; m/s^2$. 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 a ;*8udbd5s0wl1ipw,utxgz 8u1(qurx bout $5.0 \; m/s^2$ 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 h8mmk47surd*o as been waiting at the intersection st8m osrd7 m*uk4arts 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 surface of planex xs8cj5pt, h fvwb*,+t X where the acceleration due to gravityw +c8p *bv,sxfhtx5,j 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 surf yufi:5-qhmkdu( ; hr:ace of planet X where th q5h(m if-:;kdu:uryhe acceleration 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 sp p,mraiqc1d(ghx++ l5eed of 15 m/s on the surface of planet X where the acceleratg,+ha1m irq(px+cd l5 ion 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 surfac mgldbu* lb**0e of planet X where *mldb*g0lub* the acceleration due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is uv;hjtp97w )ce ms 0rl45j cm9csually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warninhj w94r0 9jmccv 7 ;s)et5pmclg, 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 vs,weetsiru1ces3 ;3:yzlx 5 6elocity after 3.00 :y3; t3se sxw6ri1c ,s eulz5es?

  A bullet shot straight up returns to its starting point in 18 s. Wh dx9-lgar h6.i5h jwi1at is the initial speed of the bull-a9rw x1i.hhgd6 5jliet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it tak g 5ba)g5tm3(b7il(rcsddbm 6e to return to its s l5 c6dmb3 )7gst ai(mgbb5d(rtarting point?

  A ball is thrown downward from the top of a building with an initial s n056oyb9dhoqpeed of 15 m/s. It sb9q5dyhn06 o otrikes the ground after 5.7 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numerical vaf :do3g7ny b-llue in7ynof-gl:db3 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 th d.q5(pmnf99nxu h u1be air with a speed of 24.8 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 12 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 12.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1.0s-09zk /kiaafo:2(wd wq bv( f s?

  In Fig. below, what is the velocity at t = 2.5 sfbx h62zhm9*5 g5m)xnjffrp0 ?

  In Fig. below, what is the velocity at t = 4.0n.s 2 ic0xtg7d s?

  In Fig. below, what is the velocity at t = 5e jsn41588auqj, vvai/ae1 ym.5 s?

  In Fig. below, what is the avernjb-4 .k ji)c.qlc7z zage velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6.o0vjmb ;of 89y0 s?

  In Fig. below, what is the afrdig)q:ah1 ; cceleration at 1.0 s?

  In Fig. below, what bbdpset5) ym)w(p k ngbkv 9r+t jm0- -z9v)b:is the acceleration at 3.0 s?

  In Fig. below, what is the averfrh8 0fx ta-*jhp1t1p age acceleration from 0 to 5.0 s?

  In Fig. below, what isgkq+2gle, gp 9 pho3x7 the average acceleration from 0 to 8.0 s?

  In Fig. below, what is the disx ob* 7i(;lcalplacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity?c/qx1 uva i80-) ,7 tbcvhxrec {speed|velocity}

  An object can have a varyini/y);5ao bzbg 0 py t+a1snyv0g speed if its velocity is constant.

  The velocity of an object can ehop1in0kv 5u vcv6 0t8e p.w3be negative when its acceleration is positive.

  If one object has a greater speed than a sph1e mk: muen+0a;tck, d9v ,qecond object, the first must have a greater acceleran9,m: uv ca+pkqd ,;emhke01ttion.

  Two cars emerge sidel ),oewn+ g8 be2mtws3 by 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 de 9:.wwv f,::duifc qsecreases.

  A baseball player hits a foul ball straight up into the air. It leaves the bat rrnrb,f m,k bvc9m,+; with a speed of rnmf ,bm9b ,+c,kr; rv$120 \; km/h$. 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 o 2 gi n,:fqn4w3 vbqy)mw3e,kzbject speeds up, what is happening to its acceleration, how does it change if air friction is ignor3:g,q,iv2k)z en qw fwnmb3 4yed?

  As a freely falling object speeds up, what is happeni 0c-yhq (epdwgvrx5d+tr+8u+i) lj6sng to its acceleration, how does it change if air friction CAN NOT tdl- vgw)prh( +d8s+qj0 xyer+ci 56ube ignored?

  An object that is thrown vertically upward will return to its original pospj t h -d71jx1yqse-0uition with the same speed as it had initially if air resistance is negligible. If air resistance0x-17 dshey1 ujptjq- is appreciable, how will this result be altered?

  An object can have zero velocity anoe;yqcx) 24vpkr5kz /6zgf7d d nonzero acceleration at the same time.

  An object can have nonzero vemomp cc 1fc;-*locity and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth fjjyn+ ynq8ql -a25, gploor making no stops along the way has zero aclg,q8 5p2yy n -jaq+njceleration all the time.

  A rolling ball moves 0*u yiu. x79( r:ra9pd abn5zqhp2yuw from $x_1=2.1 \mathrm{~cm}$ to $x_2=-6.9 \mathrm{~cm}$ during the time from $t_1=2.2 \mathrm{~s}$ 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 $t_1=-2.9 \mathrm{~s}$ is at $x_1=2.2 \mathrm{~cm}$ and at $t_2=4.2 \mathrm{~s}$ is at $x_2=7.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight cormi0ht 6a-0m lmplete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 10.1 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 114 m away i+5dc.dmd o t0mn 8.4dd cd5. +mt0om s. It then 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 froq bao3jq51ro65 yjr i+m $11 \; m/s$ to $25 \; m/s$ in 5.1 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 , ud..7krv 7 5gn3: gkjqdbjzr$20 \; m/s$ to rest in a distance of 69 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed of k z+jf c8*gnuq hn()3a$27 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.2 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top:awoiiq1x+ h/u(hd.yvu c,ja w7 mp 00 speed abou wm0d 7c hi uv.:aayhqwu,j01poxi /(+t $10.8 \; m/s$ in the first 14.9 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 tpvp(r /lrxs /k 5-o7+j1fcxgspeed of $19 \; m/s$ to rest in 5.96 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. Assuming;qm41wn2lh y 9fn j3dn a decelqf4;ymn 39 njw21dhnleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trucio1q-ne/y tjta h0*c/n w0v6h k 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).    $m$