Suppose that an object trave5p)xox)z a;u kls from one point in space to another. Make a comparison between the displacement and the distance traveled5 px kz;oa)u)x.

  When is the average vellpm0z 9sln3j2 *5vpe c,6ay moocity of an object equal to the instantaneous velocity?

  A new car manufacturer advh dx4kv;j3(-u qa)eo vertises that their car can go "from zero to sixty in 8 s"-(h3 v uoe 4x)q;ajdkv. This is a description of

  An object moving in tourlkk1dvti83twt8 (p0g 2u 4he +x axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+yht ; boe 3rg1t l03chv44gs,nx direction) begins to slow down as it approaches a traffic 4v;l0bt sgte 3h,gc3hyon14 rlight. Make a statement concerning its acceleration.

  Suppose that a car traveling to thekq :zum9f3rykk2( ew) West (-x direction) begins to slow down as it approaches a traffic light. Make a :2wef 3u9ry kqk()mzk statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a stateme5t * i,7tbi/og*d hcjjnt concjg7 j d/t, t5io**bihcerning its acceleration.

  If the velocity of an object is zero, does it mean that th i/(*kjxeki/n e acceleration is zero? Support your nek/(i/ij k *xanswer with an example.

  Can an object's velocity change direction when its acceleration is constanthxa+) t2*ufws ? Supp asf+ut)w*2xhort your answer with an example.

  Suppose that an object is moving with constant n0h hs9 (kmfmezax9xf9 t pw,p:;1:nkacceleration. Make a statement concerning its motion withhzt(f xm,hxe0ksa9 :k ;n91w:nfpm9 p respect to time.

  Can an object have increasing speed while its acceleration is ubuz 0z2)t.*0k qvh7udmte ft34 kz(tdecreasing? Support your answer with anu (e*73k.bz2tt4f 0zkt)0 humq dvzut example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. Mak7(,s qjaa,,w4a 2k r0/t rgv b.pztpdke a statement con.ks4 g(d2r t, ,/zajatkv7aw, pprqb0cerning its acceleration.

  Under what condition is average velocity equal to tidi //cyjs5v4 he average of the object's initial and ci4sy/dv/j5 i final velocity?

  Objects A and B both start at rest. They both accelerate at the saby:hn5p y-2q nf8r.n,p kbjo2 me rate. Howev5:hp 2,pbbyy j8qrn- .2fokn ner, object 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 accx jo/y+o ,k9+bzd)4a wf 5wbejelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared tboejxa,)5o9 /fw kbjd+y+z 4wo that of object B?

  When an object is released from rest an( qt)g eeqk9 gl6 (qyro-:o4xym:qt k4d falls in the absence of friction, which of the following is true concerning its motiony9k -eyqq(:qog e:r x6t)4kqlm4t og(?

  When an object is re rlrb4/ r+ ,woa;yzc9hb4gen f he572bleased from rest and falls in the absence of friction, which of ewrbc4faln y4 r,hg9+b zoe5r2b7 h/;the following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement abouyi(*nhx2-o xp 40g7r jdjurr; t the velocity and the;*x-7o(jx42rghnd r0uyripj acceleration when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration ju5z pwh(9x kcvq /j6q,ust before it reaches itc,k(q h6/5 uxw pvj9qzs highest point?

  Suppose a ball is thrown std*f:fnexf) z p1 0be,araight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball zb0nf :xd,ef* 1p e)afis going up.

  A ball is thrown straight up, reaches a maximum height, th+* )d2ss dmbguen falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball id *s)b gd+2umss coming down.

  Suppose a ball is thrown dalwjk *34 j yvpcl,p0s0db.e,ownward in the absence of air resistance. Make a statement concerni*0 j., jba4,s3eckvlyd 0pp lwng its acceleration.

  Suppose a skydiver jumps from a high-flying qk3 gfyc2 (q03xgqf.zplane. What is her acceleration when she she reaches terminal velocity0qfgk 3g 23q.xcfyqz (?

  A ball is thrown vertically upward with a speed v. An,:dwuc.s g aqnx s1 2u-.dyv;p identical second ball is thrown upward with a speed 2v (twice as fast .av.du:2uysx1-ngd q;wscp,). What is the ratio of the maximum height of the second 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 later, bal+:lh1mzu1j qmf;xv2 ahvdt50 l B is dropped from the same building. As time progresses, the distance+lmuz1vhajv0x2 t; : fhd5mq1 between them

  Ball A is dropped from the top of a building. One second liz:a6(e/ avqa ater, ball B is dropped from the same building. As time progresses, the aav /6aqz:(ei difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown 2./eaodgig/ :u5c nm jup, and the other is thrown down, both with the same initial speegdcma/ enio 52u./g j:d. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second bricca1tmdo j5dya46eyvxo*;- x)k is thrown straight down from the same*dxo 15 oycx-d;4evama) y6jt building. 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 in8uj10x x+aie g the +x axis. The position ver10 iaxjxe8 +gusus time graph of this object is

  An object is moving with constans.d 9o8)qoc/bukrh )l t non-zero acceleration in the +x axis. The position versus time graph of this object isl d)skr/oh.u qb co98)

  An object is moving with constant non-zero velocity in the +x a*xh(vsw (arq(ym)+ykaf0 x1 p xis. The velocity versus v(yhaf akx*x((yr p)s+1 wmq0time graph of this object is

  An object is moving with constant nh5ys/yt5w:l d0: r kcion-zero acceleration in the +x axis. The velocitykd :i yt:w0/ ylscrh55 versus time graph of this object is

  The slope of a position versus 0pcf83zw dtco2lx y,0time graph gives

  The slope of a velocity versus hv;v w- n3oydn/wc14y5(gdfa,og;mt time graph gives

  The area under a curve in av5wu 9uhvf7 j(n acceleration versus time graph gives

  The area under a curve in a velocity versus time4.l sx;4wb, h1 vuzkmq graph gives

  If the position versus time graph of anwn6gr 3h pjtzcnsu36/x0 zs*3 object is a horizontal line, the object is zn r6*ctws03zjsg3 hx63up/ n

  If the position versus time graph of an object is a 29fjx meer6hd 8do+2 rawb i7+vertical line, the object isrx2 7de+faw d8r6hm+je9ib2o

  If the velocity versus time graph of an object is a horizontakqdvi3aen ww1zotd/r:r 0)29 l line, the object iqtrd2 ):0w9 /v z3rdkaew1oins

  If the velocity versus time graph of an object is a straight line makinqtxy vay8 ()i..bdm4z g an angle of 30 degrees with the time axis, the object ity( qam zxv.b4iy8).ds

  An object moves 15.0 m n *we;f(b4sitl orth and then 11.0 m south. Find both the distance traveled and the(bw ;f *ites4l magnitude of the displacement vector.

  A boat can move at 30 km/h in still water.(qd8vkqyd*i ,7h6 yl u How long will it take to move 12 km upstream in a river flowing 6.0 km/h?uvidd8 , y*kylq(76 hq

  55 mi/h is how many m/s? (1 mi 05yfrgvy.5.rh3 x 6lbhs0 uqb= 1609 m)

  What must be your average speedw9zo. isd bb :qda0fx/si)a1* in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 29,o chr ,vkuf0a*bg/ m hours and 57 min. What is the average speed of the runkv,ufa*hgb/ 9cro0m,ner in m/s?

  A car travels 90 km/h. How long does it takm e3fq9vi* t0be for it to travel 400 km?

  A ly (light year) is the distance that light travels in ocbeehf.6hr3 (ne year. The speed of light irf.(ehc he63b s $3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

  If you are driving 72 km/ nrc jp*qotavwz5cj;8 894gd5h along a straight road and you look to the side for 4.0 s, how far do you travnr d5tojwcp59aq;* 4v88 g cjzel during this inattentive period?

  If you run a complete loop around an ou9qbu :t svm550 qfgsv8tdoor track (400 m), in 100 s, your average velt8:u0qv 5sg fv9bsm q5ocity is

  A polar bear starts at the North Pole. -si mekhs-.st8fx (n3It 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.nx sfk ss38.-ime(t-h This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole.;rzx(z* vc8un 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. Thu r8;z x*vcn(zis 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 11 1zd0fqwru4xl+l*zs4 0 miles. It then starts to snow and you slow to 35 mi/h. You41qlurwszf*xd +40zl arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at jx;1 bzg) 6fbw(s1knf ur8)yj80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for this )gnwfx)(y8b u;b 1kjsrf1z6j trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her av9(uimuu28 ff io;.k rd(s 0iolerage speed for the 9lui2 0fof(s i8u r(ki;udo.mtrip?

  An airplane travels at 300 mi/h south for 2.00 h annesa;apqb d((8 ,k wc5d then at 250 mi/h north for 750 miles. What is the average speed for th5c(w; ps,a(nk ae8bq de trip?

  In a 400-m relay race the anchorman (the person a+f/ lnd loizj0;++iv 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 i;+a+o/i0lzldnj+ fv 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 10c+e 5gxx wdd(i/g/qr 1c2i v0p s. The car's average velocity during decv( 5qdw1ix dcip/+x g0c2ger/ eleration was 50 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed -6krbf pe0 ,fh)j,zzt borzw5 1b (z0qfrom 100 m/s to 160 m/s, at the average rate of (bjf0r56)z, 0tpf z bqwzbr1 ozke ,h-$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rxw:.fdqc )w8bate 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 re ;u*74x)cg+ rbtccoycst 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/s for 10 s7lt dte)rk, 9fm6 wg2u. It then speeds up with a constant acceleration o) udmet26g9,k7w t lfrf $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 3.8 m/sb n/c:4oux5gs experiences a constant acceleration of :o/ g5ubsxcn 4$2.0 \; m/s^2$. What is the cart's displacement during the first 4.8 s of its motion?

  A bullet moving horizontally to the right (+x direction) ij,hctk ; i9 :r*46hc *tgurjcwith a speed of 309 m/s strikes a sandbag and penetrates a distance of 64.38 cm. What is the average accelec4;u:9ithigr jr ,t 6c*jchk* ration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrie yqopt1 4n4jg)r. It reaches a speed of 42 m/s at the end of yj)qo4tgpn 41 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 acceleratp7)2ur; ;ev.*,mq3b nfc )of djwvgo tion 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/)hoo.*xljmts mn + h9cj,u8f of 200 m. What is its average accelm),j n 8x/t. +ol*msucj9hfoheration?

  An object starts from rest amb- 2fi f,vw3tr,.tgjj2:drcnd undergoes uniform acceleration. During the first second it btjgc:twi2djfv2f3 -rm.,r,travels 1.4 m. How far will it travel during the third second?

  An object is moving in a straigh9ax t,y;qi)est line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10qsx ,t9iae;y ) m/s. How far does it move during this time?

  A car starts from rest and accelerates un wg5yx1 w140hwmkl- cxiformly 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 b:-mm5w7rz2wyq p 0ok 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 at t44em tni;u )litxsg +2he intersectit2teus+4mi;n)g4 l ixon starts 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 surf4 lu -.4osxv 0huitlx;ace of planet X where the acceleration due to gravity i- x44vouthl; .lxs0uis $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed of 12 m/slmpz* u-y-6+sv.dcii2 ;alj) ok5qpk on the surface of planet X where the acci ;p)cd+.mp2k-li az 5ojl *vys kq-u6eleration 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 speed of 15 m/s j(i .+uruzez.on the surface of planet X where the acce+j z..eru(iuz leration 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 sh.:s szn+ sy:m3 vgww-urface of planet X where the acceleration due to grz3s:w:y. n s -smwgh+vavity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually nhrk .a(okw b*20/ofm67ytv wgreater than 0.10 s. If your friend holds a ruler between your fingers and releases it without war(w t/2kv70krf y .whom*6noabning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19 bp.z6g8)m56df vd+ wycbgt f+.6 m/s. What is its velocity after 3.00 s8 +bg+f.b wydmz) p5d6 6cgtvf?

  A bullet shot straight up returns to its starting point in 7 s. What is the n0uhk8mb7g 6 oinitial speed of tuko8 7bh6mgn 0he bullet?

  A ball is thrown straight up with a speed of 36.0 m/s4cw ynu8j 4didch(u5 -. How long does it take to return to its sta-ucijc8(ud ynd5 h44wrting point?

  A ball is thrown downward from the top of a building with an init upc uu as.l )p29rr1 zbuj,lt:sa2(9tial speed of 25 m/s. It strikes the grouuz1 )bssur(2r ,:uaa .29p9up ct jlltnd after 4.3 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only t1tk+ 3 oemov7fill in numerical value in the bmokt3 e+v7ot1 lanks)
(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 31.3 m/s. ( *y/mluhmt1l(:sy)muq/;q k h 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 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 is the vex ixmqwmb0 /d 14n6yziq c yx;,g+kp::locity at t = 1.0 s?

  In Fig. below, what qcb/cls z mrjx6 07p01is the velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t = )o- 4 a.5i v1mfqykn:vb*decg4.0 s?

  In Fig. below, what i9oeetx4 a) p2b nxj.7(zbldlf ct4; /ss the velocity at t = 5.5 s?

  In Fig. below, what is the average velocityuoy+ 6u x0wt f36 5xowj2t;azd from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6g xd/(vl4h9 mznf5/gk.0 s?

  In Fig. below, what is the accel8w lkuoe3a :bh7p8,kh eration at 1.0 s?

  In Fig. below, what b1(u.kbp 0m ayt8uj,ba7d *o2 y lba9gis the acceleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to afxf w**bs- t-5.0 s?

  In Fig. below, what is the average acceleration from 0 to 8.0 s?h p8uaoglb;:n )mp*,c

  In Fig. below, what is the displacement from 0 t -4a1opodcjgc;v :.mwo 8.0 s?

Does a car speedometer measure speed, +fq2zs una7:4s2uvu (rme ej7velocity? {speed|velocity}

  An object can have a varying speed if its velocmh5b,n ei6yo+ ity is constant.

  The velocity of an object can be negative when its accwrj.n m: zm3ti8*jc k 8v10ltieleration is positive.

  If one object has a greater speed than a second object, thgagd 2gmlx q46 .j.a(je first must have a greater ac. g gjj l2d.4(qgxaa6mceleration.

  Two cars emerge side cg3k s;9olt;9xy 0kp nc9mxr4by 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 +unu5kjz7wuitslbd2 g 6lqnr jjj 6 , )pa::*7speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. juj3a,0 l 9 dgpgq;:t /yqvbyvmm,9y( It leaves the bat with a speed ofqdyvvj9 3 ,j;9,a(pgyy/qgltbum0:m $120 \; km/h$. 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, whaih4h72yca 33yww w tr1t is happening to its acceleration, howc yt rw7ah1iyh3 w4w23 does it change if air friction is ignored?

  As a freely falling object s2k;q g g7ssbn4peeds up, what is happening to its acceleration, how does it change if air fricg ss4qb;n72 gktion CAN NOT be ignored?

  An object that is thrown vertically upwa we, h+me-j10lypq)ovn;y -pxrd will return to its original position with the same speed as it had initiw +y -)1mnh ;l-,jpvx qe0ypoeally if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at the+ .9obmu / vwre7v4c a0b0lmfl same time.

  An object can have nonzewinnn/spq c1 av1342kro velocity and zero acceleration at the same time.

  An elevator moving f:ewen ty-87al rom the second floor to the fifth floor making no stops along the way has zero acceleratiatylnw- 7:e 8eon all the time.

  A rolling ball moves frrgw(ny( 9o kmc .ia2vgn68)qnom $x_1=3.0 \mathrm{~cm}$ to $x_2=-6.6 \mathrm{~cm}$ during the time from $t_1=1.0 \mathrm{~s}$ 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 $t_1=-2.4 \mathrm{~s}$ is at $x_1=3.1 \mathrm{~cm}$ and at $t_2=3.8 \mathrm{~s}$ is at $x_2=7.8 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a /ved) t84gmpv rx/ck(v6wg2d quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.6 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its rh bm5;o q91:kz gsr4cfm,by5trainer in a straight line, moving 110 m away in 11.0 s. It then turns abm4m z5h r yqfsr,k1ocbg:; b95ruptly and gallops halfway back in 4.7 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 frabm g6ng y.54 v;c+ljxom $12 \; m/s$ to $23 \; m/s$ in 5.7 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 fro5mb2xg s7 yo k88ibaw6m $22 \; m/s$ to rest in a distance of 56 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a st;a el. 4it 2rqa2cs/0tjc -orpeed of $30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.3 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out ofouf n1:exg+k0 the blocks to essentially top speed about x+ungo 1fe0:k$11.2 \; m/s$ in the first 15.0 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 f9c83qq9zd d4re.kf k+i *dogqrom a speed of $17 \; m/s$ to rest in 4.67 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. Assb9l25 5./u( nigrsr7zh8a bjk/ ceasquming a deceleruc qbn 55bj/ihss.ale2 7(kagr r8/z9ation of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goiv pqkr:74nf /uug 5ri1ng $25 \; m/s$ 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).    $m$