Suppose that an object travels from one point in space to another. Make a compah)0 ;d hotr/a,rttro lk(f :3vrison be (h3/v,d rlth)frotrk:o0t;atween the displacement and the distance traveled.

  When is the average velocity of adk ,o t-c;frh+n object equal to the instantaneous velocity?

  A new car manufacturp ey d,grteysb: c(/;3er advertises that their car can go "from zero to sixty in 8 s". This is a descr:g,y;ed 3tre bpsy(c /iption of

  An object moving in the +x axis experiences an 0f/+ )2*vtxz)naf2hwyrsv zzacceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direc/:0qn bu 8nq3yhe)n05 atovpftion) begins to slow down as it app v:bt/5 0hp0y 3uon8)a nfnqeqroaches a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) b6bt6f,ncfc - ybkghpto pb;i5wi +5((egins to slow down as it approaches a traffic ligho5f (6n+cb biftkc(ppi,y56g -tw;h bt. Make a statement concerning its acceleration.

  Suppose that an object is moving with a cf-paj/ qop)p,onstant velocity. Make a statement concjfq-pp) /,oap erning its acceleration.

  If the velocity of an object is zero, does it mean that the acceleration is zer/:ukd 3, i,;*(iiuhnv ,fs2yts jcumio? Support your answer with an exa,h,/mjsci3ky;u v (2s t u*n,:duiifimple.

  Can an object's velocity change+um mbvb -u)7ox*e 2yx direction when its acceleration is constant? Suppoebuy )-+ b*xv7 uxomm2rt your answer with an example.

  Suppose that an object is moving with constant acceleration. Make a statemen(fyqjf eu1 * ;;wmrx /wsrp/c6t concerning its motion with respect r ef; *qcu1 w/y(msx6p/wjrf ;to time.

  Can an object have increasing speed whiabjq*g 5 h55*p,*mplpdzglyw8ik* 1 yle its acceleration is decreasing? Supportl ipz5yg*yjk55 mpb*d,gp8w *qlh *a1 your answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of a0th4ut n+3o.4 i7mtzo i/ted ice. Make a statement concerning its acce .4td30the tit/o+m4o7na z uileration.

  Under what condition is average velocity equal to fuo6e)cm)(fv the average of the object's in)(u c 6fv)omfeitial and final velocity?

  Objects A and B both start at res,6 j mxa* gkll+0vki4yt. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of obje *aj ,lxy+gklv6m04ikct B?

  Objects A and B both start from rest. They both accelerate exjmpe79g 1 )7e jl:vzat the same rate. However, object A accelerates for twice the time as object B. What is the distance trav19:me 7v 7)l xjjzegpeeled by object A compared to that of object B?

  When an object is released from rest and falls in the absence of friction, wjm5b7 a gzs7d/*a4oci hich of the following is true concerning its motiz7jiaa*7o bc dsgm5/4 on?

  When an object is released from rest and falls in thbpye7brs *k08w zn c*6y1u0fve absence of friction, which of the following is true concerning its cyn10*8b * sw6 0epukz frb7yvmotion?

  Suppose a ball is thrown straight up. Make ab( d.lvhyb2fi*y p++t statement about the velocity and the acceleration when the ball reaches the l2h y +bdvy+.tpbf*(ihighest point.

  Suppose a ball is thrown straight up. What is its acceleration just before iti9xn 8t9 ,zzsb reaches its h9znb xs,z9it8ighest point?

  Suppose a ball is thrown straight up, reaches a maximum heighj+il 0*l.qxb rt, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is+0 jqx.li *rbl going up.

  A ball is thrown straight up, reaches a maximum height, then8so,i 3grafs8hd *9y wpvmdo; *1g8kp falls to its initial height. Make a statement about the direction of the velocity and acceleration as t; ,wos*iposgf 1988*gdr dkah3v ym8 phe ball is coming down.

  Suppose a ball is throw(6di+w7a+a0muj p qjo7g g.w bn downward in the absence of air resistance. Make a statement con wum.w 6+dib7a( aj0pog+7jqgcerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What ij6+l.ceta u,s s her acceleration when she she ,luajec6+s .treaches terminal velocity?

  A ball is thrown verticals51l w coh pl4i7/5bcdly upward with a speed v. 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 t5c4lich1pl bd osw5/ 7hat 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 laea0a ;q(3k hgifoz -(zter, ball B is dropped from the same zke;(( af ioq03azg-h building. As time progresses, the distance between them

  Ball A is dropped from t bo (2ikki23dals3g e+he top of a building. One second later, ball B is dropped from the same bu33lkg2a( k2b+ deisioilding. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown up, /dz2dpt 9x-.u vx a;lwkat).eand the other is thrown down, both with the same initial speed. What are their speeds when they d;dxleava p. ttu-)z/2.x w k9hit the street?

  A brick is dropped from the top of a6q7-)ug(s2+ofkfz/j ns t hm t building. A second brick is thrown straight down from the same building. They are released at the same timsk) jg2 /zo(ms 6f tfu+-ht7nqe. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x augah *pb72(j uxis. The position versus time graph of this object hug*ubaj(2p7 is

  An object is moving with constant non-zero acceleration in the +x axis. pl-t+phcqd:- The position versus time ltp-pq-cd : +hgraph of this object is

  An object is moving with constant non-zero velociioc: 01qlt -o2rm ctf 5ggpv a0;iza w75c1w.uty in the +x axis. The velocity versus time graph of this object i:1i ; g1 .-w2avctl5wmz5o0oagr fupc7i0cqts

  An object is moving with constant non-zero acceleration in the +x ax1x2swkya k37d ) svdr u-w(mqc6nwl(8 is. The velocity versus tim62knd d urlmy)(37s 8wa wx1-s wcv(kqe graph of this object is

  The slope of a position versus time graph givzxtc1zvq w0w/i/) -kfes

  The slope of a velocity versus time graph (jt (42etn0, nwxeoxp gives

  The area under a curve in an acceler nbnqe00jt y96ation versus time graph gives

  The area under a curve in a velocity versus time graph gi0 j5cv+:ru/ftcq t lc(ves

  If the position versus time grapca //hun/p.cjs :z etkr re+-6h of an object is a horizontal line, the object isshct- :6p./ce/rr z/jn au+k e

  If the position versus time graph of an objdef/ziu dl5(l (fd,s;ect is a vertical line, the object isd5z /d el;ffsu(l(i, d

  If the velocity versus ti:0jyt9pei h bdtu3l) /me graph of an object is a horizontal line, the object iud/ et:hjt 0lpi93y b)s

  If the velocity versus time graph of an hw/*epcs q:z5object is a straight line making an angle of 30 degrees with the time axis, t /z5h q*sc:epwhe object is

  An object moves 15.0 m north and then 11.0 m south. Find bothl0kcl(q 3q ac9 the distance traveled and th9 aq(c k0cq3lle magnitude of the displacement vector.

  A boat can move at 30 km/h rdp(dak7d 0q 6in still water. How long will it take to move 12 km upstream0dpdak rdq7 6( in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 m)/vggwd :iix(ltgy)2wd (5 ff tt8t80w

  What must be your average speed in order to t w *bfw*z9 5w(yfhn+yhravel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 m r/1zy6t5 xclhours and 57 min. What is the average speed of the runner in mz tm1/xc 5lyr6/s?

  A car travels 90 km/h. How long does it ta0uh *5zcs9 xag8tw;ymi4bu5 pe ;*pyvke for it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. The sp qe(m99 zgxk8 bp-v ngx,s;(ojeed of light (xqknm(g89;zoxs-g,j vp be9 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 axig(wz z8j;5o straight road and you look to the side for 4.0 s, how far do jw5zg (xiz o;8you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in : xc,/emhqu5p100 s, your average velocit/,:hmxeuq cp 5y is

  A polar bear starts at the North Pole. It travelszg9lec2:y8m 24 i nfsa 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'fg: 8le isn42c2a zym9s average speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1xk rw g g27iwx.w.s5oubj /6+t.0 km east, then 1.0 km north, then 1.0 km s g+kix6wx.jt5/w .brw go 7u2west to return to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a wqq4t( yz 7iawg,p0fta0ij 82weekend from 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 hours and 15 minutes. How far is your hometown from ,ziyqai800wjg t2(af t 7qwp4 school?

  A motorist travels 160 km at 80 km/h and 160 km gnm(r;d( h )w0l v0kzhr9srf5at 100 km/h. What is the average speed of th5h 9lvk0gh(nm ;rfr ()dsrzw0e motorist for this trip?

  A motorist travels for 3.0qg:y 50jrl)) agev a;f h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the tripf5)q0 jr gv);leay:ag ?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h npj7nnr*c. 1r lcne2 yic0b.w(orth for 750 miles. Ww0ccnr ypnnir1 b. 27j(l.ec*hat is the average speed for the trip?

  In a 400-m relay race the anchorman (the pery+4ng(;mp zpjp k8d(oson 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, in order that po4+(pz( nd;gy mk8pjthe team A runner not lose the race?

  A car decelerates uniformly and comes to a stop after 13 s. The car's averag1ken4e. b ben+haq 6+me velocn6.he e+a4m1n qkb+e bity during deceleration was 69 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed f ia00 ;yrr+u ficid6p*)+o fmhrom 100 m/s to 160 m/s, at the average rate of pfiii h)+ yum;arc0f6od0* r+$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accebsq..fx q-1otlerates 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 accelax9ub z- i j ,lips6snv3l-4h+erates 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 constants+qc--ig b50 ii -nusy acceleration ofqi sg- -yius0+5inc-b $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 7.8 m/s experiences a consta h:b)pfad +a ay19)m99kdlf aknt acceleration of f ald)yfh9 dm1)k+9 9b:aapka$3.6 \; m/s^2$. What is the cart's displacement during the first 5.8 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of : jxugma9af-0,,0hwh/ eumrf410 m/s strikes a sandbag and penetra0 hm0ffma:rj,g-ahue u,xw/9 tes a distance of 43.00 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a cataps-4 5u oqtv2zj)n6qlxxepx+9ult on an aircraft carrier. It reaches a speed o5l-s)t9qq p vnu+ 2xx6e 4zxojf 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 constant acceleration ofg pgu /svmc;e12o.txcn : c;xg 05d2tm $2.0 \; m/s^2$ 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 tokalyvfe. k l;-xp5xp37bgl 89 80 m/s in a distance of 200 m. What is its average accelef.x8p 57lkkv-xglyp9 ;l b3 aeration?

  An object starts from1.vbz 5g3. ka tc8owij rest and undergoes uniform acceleration. During the first second it travels 1.1 m. How far will it travel during the third se igb .1zkao85 j.tvcw3cond?

  An object is moving in a straight line with constant acceleration. Initially b bz( 6)jrrq(xit is traveling at 16 m/s. Three seconds later it is trav(bx r(jbr qz)6eling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniform9fn qp /ng *)rwrl/;rd6dbq:bly 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 a4rqf ynxv 7 nh+7(5nrm;dym,m t 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, 0ejy*u/s2pt za car that has been waiting at the intersection starts ahead with a constanjz*/ te sy20put 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 upwaxjjp0r o(u1 9prd with a speed of 12 m/s on the surface of planet X where t pjr9(u01jopx he acceleration due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upwari1 cfya 0vq+0kmbn-b.q1hp6rd with a speed of 12 m/s on the surface of planet X where the acceleration due tfb hc+.qvai1k6y - nb0prqm0 1o gravity is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown ut0et .:nhgm;bpward with a speed of 15 m/s on the surface of planet X where the acceleratg.em: nt ;0htbion 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 spee-fwm64 zapc7p p:8 41yvpn1dycb1p*5hwivf g d of 14 m/s on the surface of planet X where the accelf7p1p4pz4y i nacdyvg511 hv8pc6-mpb fw *:w eration 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 grea g.r-arzisv p 9 /6djsp7;9vtkter than 0.10 s. If your friend holds a ruler between your fingers and releases it wr ./pdrkv ga 9tjzs;vi96-p7sithout warning, 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 after 3k,vc7 n0c:.hgj+c* 3gzgthxm :nzcjm,xhh 30+g. *cgt vk gc7.00 s?

  A bullet shot straight up returns to its starting point in 4 s. What is the i+la*,cum *tfoam)7 lnnitial speed of the bulletau*m l,+7*o)nfa ltm c?

  A ball is thrown straight up with a speed ofwfut(.e;t.s ; k5z 1jh*drl3p5 dgmin 36.0 m/s. How long does it take to return to its startimz 3lt.1 ge.5; pftinhd* (dujks;r w5ng point?

  A ball is thrown downward from the top of a building with an initial speedlnvyr4c. j5c vm58p/r of 10 m/s. It strikes the ground after 5.5 s. How high c 8lcpm5 nrrj 4v/.5vyis the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numer4jbd/i-s))ra ,1ur vh-a fynqical value in the av,4-ha-y sr jdbruf)1q) ni/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 witadiiql,pm63q8gz)o fuw; s46 f8tbc( h a speed of 44.2 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 15 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 15.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1.0 sit3sqdb. qn+h6sj+ ;9* pkeyc ?

  In Fig. below, what is the veloci6l ;tbi+a :6fktdh2e sty at t = 2.5 s?

  In Fig. below, what is the ve*n*, hmhdz l;* 8gb s)7xxkvaelocity at t = 4.0 s?

  In Fig. below, what is thea*t(o7l vzwl2 velocity at t = 5.5 s?

  In Fig. below, what is the average velocrmejus9i.+ w+(ary h 0ity from 0 to 4.0 s?

  In Fig. below, what is the average/e7deo3r ftjgoyt5 ,/ velocity from 0 to 6.0 s?

  In Fig. below, what is the0y l2q*ifow8grx +he9 acceleration at 1.0 s?

  In Fig. below, what is thvmub21j dkfkudthq/ b,i:1.tt r a)38e acceleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to c5p: na vbuw6fxh;-: aie-c(n 5.0 s?

  In Fig. below, what is the average acceleobn 7j ,3:g5 ;zmhcybu3f mi4jration from 0 to 8.0 s?

  In Fig. below, what is the di/mu+ji 4lgr, );dbp3 aqz3ah *qyd l/nsplacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|velocity}ij5q4+i+ escj

  An object can have a varying speed if its velocity isxd1fyap,p) : j constant.

  The velocity of an object can be negative when its acceleration ip a1fi t m*i5cc(a9*kjs positive.

  If one object has a greater speed than a second object, the first mu bvh,fi wb(8sx+r3+fost have a greater acceleo,ffh8+ v( +3bwrbs ixration.

  Two cars emerge side by side from a tunnl3 n 5qi7( ,z- oub1tgwhtlv.yel. 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 v. yav t,o k7q/7htr8kin speed as its acceleration decreases.

  A baseball player hits a foul ba4 n0pi* wths6jll straight up into the air. It leaves the bat with a speed o6inwt0p js4 h*f $120 \; km/h$. 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 happening to itsz,e;5q0g hl:w7kxp ns acceleration, how does it changw,h;e nqk: px0z75sl ge if air friction is ignored?

  As a freely falling object speeds up, whaf vme*hp 2,r8bt is happening to its acceleration, how does it change if air friction CAN NOT be ignored? 8r2pm,vh e*fb

  An object that is thrown vertically upward will reyro1z a+7hvx6turn to its original position with the same speed as it had initially if air resistance is negligible. Iz+x r1yo6 avh7f air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at the sa4 -den4 *ykqnime time.

  An object can have noh pvk )rbrswokz;vy 4 - oq6o2143wkf-nzero velocity and zero acceleration at the same time.

  An elevator moving from the second floor to the wy+kx)o wi9n.zq)b 3gfifth floor making no stops along the way has zero accelerat+yxw go n k3qziw9.))bion all the time.

  A rolling ball moves frof.85 7m ex2j9o g)qhe qxxd,ev+jm7jsm $x_1=2.8 \mathrm{~cm}$ to $x_2=-4.7 \mathrm{~cm}$ during the time from $t_1=1.3 \mathrm{~s}$ to $t_2=5.8 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.7 \mathrm{~s}$ is at $x_1=2.8 \mathrm{~cm}$ and at $t_2=3.3 \mathrm{~s}$ 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 quarij;im: 7 87anjuwp-suter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.3 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 92 mka u2 awr/w7yyh pfw0 ks,-dk:z*ul.6 away in 10.1 s. It then turns abruptly and gallops halfway back in 4.7pwzdwluw -:ha2/7y 6kfu0k *s ray.k, 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 fruljo- k68, )qg aq:+kt)5fgdms-bsl q om $10 \; m/s$ to $24 \; m/s$ 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 fromdwxq 1bc0g+o-j c5c26mzfe g7 $18 \; m/s$ to rest in a distance of 82 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must re,oxjvr,o g*g0 2vze-lach a speed of $29 \; m/s$ 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 of the block0qgm0e7h q q/hiv*w +hs to essentially top speed abou0vq q hgmewiq+ h/h7*0t $10.9 \; m/s$ 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 speed wz m5cxq/m (x;t7o m4ur 6ikw8of $18 \; m/s$ to rest in 4.99 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a cwj q du 4 :v/ni-;(sdgldenb;3ar leaves skid marks 92 m long on the highway. Assuming a decelernq4ieu ; /(lwv3d-d;bng:jsdation of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trucrc3c ; cgzd i;h9g qdd9u83au l0-vk-sk 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).    $m$