Suppose that an object travels from1sddxkhl yz.k pqk k04(;:3zxf04jxp one point in space to another. Make a comparison between the displacement and 0 xp4kky 3xjx :(qslf4p 1.dzzh dk0;kthe distance traveled.

  When is the average velocity of an object equal to the instantane q8 *gri00tt15oya azvous velocity?

  A new car manufacturer advertises that their car can go "from zero tbjt2j,2*xf k bo sixty in 8 s". Thi, 2bkfx t*jj2bs is a description of

  An object moving in the +x v;v3i89wtca j a) j4csaxis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow down a9 zl/ f7i*glmis it approaches a traffic light. Make a statement concerning its acceleg*fmlz/i 9 li7ration.

  Suppose that a car traveling to the West (-x directj3cjw6w( ksi: ion) begins to slow down as it approaches a traffic light. Make a statement csij: k36jw w(concerning its acceleration.

  Suppose that an object is moving with m,ar0p 5 ,3cqgfcvlf/ a constant velocity. Make a statement concerning its accelera53r,lmga 0v /cf ,qfcption.

  If the velocity of an object is zero, does it mean that the acceleration isl w;id2kc*pxkv33g m - zero? Supdl;pg v2w 3kk3m- c*xiport your answer with an example.

  Can an object's velocity change direction when its acceleration is c-6 )frcyqz6 y8,*(s/ucs urnij1dhlionstant? Support your answer with an ex-c/ niu lz sjr1du( 6yci qh,6sf)r*y8ample.

  Suppose that an object is moving with constant acceleratih ymmkeba.2a 2f5ing r/(,3kyon. Make a statement co/mf.2 bykm5 re ya3ng(,ai 2khncerning its motion with respect to time.

  Can an object have increasing sp2ot +u9bxpw l)eed while its acceleration is decreasing? Support your answer witbow )xu 9p+t2lh an example.

  Suppose a can, after an initial kick, moves up along a smooth 4bs-h1te x03+oencbjc 6 /ptvhill of ice. Make a statement concernin bt1+n6o0t4cee /vhxj-sbc3 pg its acceleration.

  Under what condition is average velocity e4qpdu12kkuw. wnv;3 tqual to the average of the object's initial and final velocitpt dkuw4q nvk;321 uw.y?

  Objects A and B both start at rest. They both acceler gz k47c2x /m6zlxf fxvo9z+x3e77qdyate at the same rate. However, object A acce 7 ezg9x 7ymx4 l+2 oq7czff6zkx/x3dvlerates 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. Thj8b x e;3l*vjpey both accelerate at the same rate. However, object A accelerates for twice the time as j3pxj8l* evb; object B. What is the distance traveled by object A compared to that of object B?

  When an object is released from rest and fahnn*c6qpk n)b2i + l(oc, ++n8 hbhkoills in the absence of friction, which of the following is true conceiinb 2*cohpckl n(h +6 bnkq ho,++8n)rning its motion?

  When an object is released from rest and falls in the absence of frictio14nf + e0v5v9ckakkp( d g* o7o+qzfdmn, which of tf g+d9*p+1 54a fzvkev7 kmdonkq0o(che following is true concerning its motion?

  Suppose a ball is thrown stramp9.+v8/ e( wvmfzti vight up. Make a statement about the velocity and the acceleration when the ball reaches the highest9ewvv8.+ tm(fm zi/vp point.

  Suppose a ball is thrown straight up. +:iwlg( m;dc o What is its acceleration just before it re wd:g(o+mlc;i aches its highest point?

  Suppose a ball is thrown straight up, reache6ntn )lp;vb*cs a maximum height, then falls to its initial height. Make a statement about n ;p6nb)lcv*tthe direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls . fh83i2ibz.ew7f e kcsy f6a*t;l)qzto its initial height. Make a statement about the direction of the velocity and acceleration as the ball is coming qs8f2) 6wz f*;ik.til. zae7 c3e yfhbdown.

  Suppose a ball is thrown downward in the absence of air resistance. Makj 7u2s/ovyw; je a statement concern/ysoj7jw ;2v uing its acceleration.

  Suppose a skydiver jumps from a high-flallohm8 pp2r* 37xcu)dfd *pxt6 6 n1jying plane. What is her acceleration when she she reaches terminlnjpdaupm)6cp3fdx t 18*o7 l*xr2h6al velocity?

  A ball is thrown verticall79cw-2gt gs .v5y ku;.ozdqsm y upward with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is t-d suy9m.5ot g.v7z2c;g wskqhe 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 tg 7qo aug/1ri ;:ft/npop of a building. One second later, ball B is dropped froof /augi;:nrtq 17gp/m the same building. As time progresses, the distance between them

  Ball A is dropped from the top of a (mk,kt-t7arks(ts 3 apz 2q k6building. One second later, ball B is dropped from the same building. As time progresses, the difference zm (r,62(ak7k a-tt3ssqk tpk in their speeds

  Two objects are thrown from the top of a tall building. One is thrown up, avk,-vfk- tjnye.+0 rend the other is v jk-e nv-t0yf.ekr+,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 se4qpj75u2 ao pxcond brick is thrown straight down from the same ua5p24oqpxj 7 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-zemp22jw k6t6 fsro velocity in the +x axis. The position vwmf62k2 tsjp 6ersus time graph of this object is

  An object is moving w yf01rhmfff tx83s9v:ith constant non-zero acceleration in the +x axis. The position versus time graph of this objec1 8y3xmfv ftrfs90f h:t is

  An object is moving with constant non-zero velocity in the +x s e u3w xnx87wg7-jr2eaxis. The velocity versus time graph of thisngwr-ue j8w 2ex37sx7 object is

  An object is moving with constant non-zero acceleration in the +x axis8qw,:m yzjtm7p16mo 6*iytq q . The velocity versus time graph of this objecoq6mqqyj:wp8,tzyt61 i 7 mm *t is

  The slope of a position versus time i..2t al kntypj4 )*tkgraph gives

  The slope of a velocity versus time 4t3dxlmm 7 .xu-gz0ea graph gives

  The area under a curve 4topl avnhnb-x+3wip;5b 4 l6in an acceleration versus time graph gives

  The area under a curve in ad-mw/lm shmzy-9e1( c velocity versus time graph gives

  If the position versus time graph of an object is a horizon bo5bn( x*uok0e3sq 0otal line, the object uonbe* 35k b(sxo0qo0is

  If the position versus time graph of an object is a verticadgbic4eruxg5 lphehl1w+v ;(0vnc3 .0wi 6i3 l line, the object is.w630 vi rblnl vcx(54ghe d c+3h0uw1ieig p;

  If the velocity versus time+hu; h:b f9znb graph of an object is a horizontal line, the object isbzn: ;h+ fbuh9

  If the velocity versus time graph of an object isdd4kz: rguasb ;8k42 ht3d9sf a straight line making an angle of 30 degrees with the ti8s4d3sadhg4 2ubr;dz kf k:9tme axis, the object is

  An object moves 15.0 m north andis/)y:ipfkc;vgq4 jpy 01n o * then 11.0 m south. Find both the distance traveled and the magnitude/;*jq0pyv)4f:p yc iokn1igs of the displacement vector.

  A boat can move at 30 km/h in still water. How long will;j5u*ae2u0hl6bo 7 f jax/mjs it take to move 12 km upjj 76f e;xoau2a0*hjlusm5 b/stream in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi y7dmc1at0f 7os udicq 979b(f;x e4 0/eajiz x= 1609 m)

  What must be your average speed in order to travel k,0 ur96t aoqv350 km in 5.15 h?

  A runner ran the marathon (approximately 42m/hk *, jzitw7.0 km) in 2 hours and 57 min. What is the average speed zt,mhj7 iwk/*of the runner in m/s?

  A car travels 90 km/h. How long does it take for it tonc g 5.(zvv1ig3dj c1m travel 400 km?

  A ly (light year) isdfs-;;8ye9d hce *l0il r wit5 the distance that light travels in one year. The speed of lightl r*w8;9il fce td50h-e; isdy 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 a straight road and you look to the side p wdxia, ;.(bmfor 4.0 s, how far do you travel during this xwp m,a(;bid.inattentive period?

  If you run a complete loop around an outdoor tr/8ma-mlxq a p-q3jl2fack (400 m), in 100 s, your averag3 lp/2aqmmlf-- jq a8xe velocity is

  A polar bear starts at the North Pole. oxb9i odxt- ml(5om+n (v42geIt travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to rel- 9dnoemimb5go+tx v((xo42 turn to its starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the No oy+ ;/) cdksrh7i.+4ljkmwj lrth Pole. 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 4jy7kw ij ;+lms kh./cr4do+) l5 min. What was the bear's average velocity?

  You are driving home on a wps j;v( k5aj7/z6trujeekend 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 sch6ju5r7k azvjs ;p /j(tool?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What ;i t *po ycp1+c(dt+fmis the average speed of tc+mt i 1 ctpdyopf+*(;he motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. Whateqo 4rldg+7avov)z) . is her average spqlzr o))veo+. 4a7 gvdeed for the trip?

  An airplane travels at 30q;s 3vm5fb1s g3clv4ad ;a:js0 mi/h south for 2.00 h and then at 250 mi/h north for 750 m53sm;;:fdab4s1a gqcvs3 ljviles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100;rh z81 29/iwmeq 4 gmbhqbbe11q 9wvc 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 fi1 ei412qh89v;/1h bbgr mwqc zeqmwb9nal 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 10 s. The car's averagehi u 946:otkud velocity during deceleration was 70 km/h. Wd k4uh9:i6o tuhat was the car's deceleration while slowing down?

  An airplane increases its speed from 10ru-m d)z9pim 7pgjb7 ;0 m/s to 160 m/s, at the average rate of im rjm-d79)pb ; z7pug$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the ra89xgvhmbs5 +d te 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 rest6adh3; lkp3yn 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 s. It then speedsk3feel -6 s1hwbpl3e 1 up with a constant acceleration ofphf13be3we1 k 6- lesl $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 4.0 m/szd+hv : r7w4k-;(z -k0ngaau v.mwmdw experiences a constant acceleration of w kwhamv 7.a-d4+;u:w -d z0nrkgz vm($4.4 \; m/s^2$. What is the cart's displacement during the first 4.5 s of its motion?

  A bullet moving horizontally to the right (+x direji8po,v 39z4bwx2 ug6yi ia9 lction) with a speed of 296 m/s strikes a sandbag and penetrates a distance of 57.l9 ,ug i2 yox8wjbip 46a9izv324 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on hi 9i7 gwsbm fvu59yru1;vu,;16sus qan aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, a uqmiiuh; r;ys 76 9,vugs1b9 5ufws1vnd this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rkqmgx9h 4 2my-wvy+0hest moves 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. What is its averag( pnywjjw9j(02 wiw k;b b*pw5e accele j;bkw i(205 jww9 nwb*jyw(ppration?

  An object starts from rest and undergoes 3gy (9mapad:crvpe 39uniform acceleration. During the first second it travels 4.7 m. How far will g3pep:9 c da(9mavry3it travel during the third second?

  An object is moving in a straight lin)37zp5fl:e+eod lf p wd8 pzi7e with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is tra8 efdfdzppl e:p+7i)oz7l35wveling at 10 m/s. How far does it move during this time?

  A car starts from rest jw(pmibo(w u6mw,9.59tqut fand 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 6 od9:-w0vmy.uh)bk7 evqvmma 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 turnwbw(vch 2qjz m, -al/(s green, a car that has been waiting at the intersection starts ahev2/,q(cb wz(jwha lm-ad 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 e wcd4)5 ;sf1ci9mpr,h lu)gbwith a speed of 12 m/s on the surface of planet X where the acceleration due to grar)m4di;pf e h)s1cu 5w lcb,g9vity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upwal8z0 t vjsoue,2o hwj78r8o8mrd with a speed of 12 m/s on the surface of planet X where the acceleration due tovt h8u7r8 0l8wz2e8jj ,osomo 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 om2rpwf(byf 5,n the surface of planet X whe 5wfp2 myrfb(,re the acceleration 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 upward0 rgvs;yvun,90a d 8dc with a speed of 14 m/s on the surface of planet X where the acceleration duev ugcynd ard 800;,9vs to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is6eh ir)iqm0v,;cjgn - usually greater than 0.10 s. If your friend holds a ruler between your fingers and releases n v 0hrq)ic,mej6 i;-git without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward .;hx.q /nb hn p:ml)nkat a velocity of 19.6 m/s. What is its velocity after 3mnb:hxl. /)n phn .k;q.00 s?

  A bullet shot straight up retf /+jdtr*otxj+ yq1x 1urns to its starting point in 20 s. What is the initial spe fj11+r*dyot /txq x+jed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. Howc a5f pv0)wliv0zkiy)r;i 0;k long does it take to return to its starting w)0)i0p;cf ; lav0rzy iik k5vpoint?

  A ball is thrown dow:+sz , hesua(mnward from the top of a building with an initial speed of 7 m/s. It strikes the ground after 5.4 s. How high is the buildseum, ahzs+( :ing?

  A ball is thrown straigql,:eg snd 7.vm.emq4ht up with a speed of 30 m/s. (only fill in numerical value v mqd 4l em.eg:qs,.n7in 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 spelp:9;g cjemp0adp*9 ued of 47.0 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 8 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 8.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the+akg1 cm 6ha:goa)w ,e velocity at t = 1.0 s?

  In Fig. below, what is the velocity1e4t. bxq 2jf0rh5kh v at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.0 swr+s2vgq / ebw3du. u5?

  In Fig. below, what is the veloci bf 2y/.+tfobtty at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 o k0)nt, wfaxuylv3ilj5:8 f 9to 4.0 s?

  In Fig. below, what is the average velocitw ex8eqk.qk fum6). q 1t0z mj5c5suk4y from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0w.ov ,(t5u x5:xgk obf s?

  In Fig. below, what is the acceleranx 9dx)b75 sylni g.7stion at 3.0 s?

  In Fig. below, what is the average acte-h/)ey+z v xceleration from 0 to 5.0 s?

  In Fig. below, what in l t0h t:z).2l;4iwqr3 6smsllkzq-us the average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8.0 tq ssfh5ks c ))i/o78ks?

Does a car speedometer measure speed, velocity? {speed|veloc+4gevp,5eohb i w )p:nity}

  An object can have a varx kru py-26;8rihced4oi+c;x ying speed if its velocity is constant.

  The velocity of an object can be negative when its ohw602zuy jtwyn( ,i0;j /) qexrf q,si3* nxlacceleration is positive.

  If one object has a greater speed than a second object, tt- ep;ap.ow9jhe first must have a greate9 oej.p;p wa-tr acceleration.

  Two cars emerge side by side from ahwazb:nc .epb8loy)2r2 m a 2( 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 erm ;m:v 3nlu6e y )5v9lnxf2pspeed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It least(pfq ,0wer, ves the bat with a spe(q rst0 ,ewf,ped 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, what is happening to i si11 v6uzmsz0ts acceleration, how does it change if air friction is igi0 svsm z1u61znored?

  As a freely falling objalm)j3c56 n r;yrvz8hect speeds up, what is happening to its acceleration, how doc3ml6n; 5)rr va 8zhyjes it change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will returuej np85(s.rkn to its original position with tr.e(nkj ups8 5he same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzer *5g:uvl+y zsph 2py)dpw+ m 1kzhk,u(o acceleration at the same time.

  An object can have nonzero velocity and zero acceleration )exy 5w2;t4pzlo 4sw cat the same time.

  An elevator moving from the second floor to the fgqxix3p)y-nzz7e.q1s d h u4 ,ifth floor making no stops along the way has zero acceleratioz4ygx.q)3s1exuhpq z, 7 id-n n all the time.

  A rolling ball moves cg6rv2uk:qmx7 ,m4xwe qoz3gd 7l1h 7from $x_1=1.6 \mathrm{~cm}$ to $x_2=-6.3 \mathrm{~cm}$ during the time from $t_1=2.3 \mathrm{~s}$ to $t_2=5.6 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.8 \mathrm{~s}$ is at $x_1=2.8 \mathrm{~cm}$ and at $t_2=4.4 \mathrm{~s}$ is at $x_2=7.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a q d)an 9fx7n oauq595spuarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.7 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 100 m away in rv7z-ymcb i4k ivfz)6us- v-;yld :9 r12.0 s. It then turns abruptly and gallops halfway back in 4.5 s. Ca9vv6rbdzyi)s - yk -7 ;4- :rilvufzmclculate (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 from 57(po 1t+k6e ovrvfq p$12 \; m/s$ to $24 \; m/s$ in 5.3 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 o 5 y:j*umkt:j$17 \; m/s$ to rest in a distance of 64 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a sbp4.sm sqpuk3; la,(l peed of $31 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.4 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially tgv+xcxn +7yv+q ,x 5htop speed abou+5,txqvn7x+ gx+hv cyt $11.0 \; m/s$ in the first 10.8 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 uni2,zv xcn 3zdh*formly from a speed of $19 \; m/s$ to rest in 4.47 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid markql /(ap+p; 4k7 cxzdu,kmgp9v s 92 m long on the highway. Assuming a decelerapk97x+l/mc4d vpk ;z,apuq g (tion of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truc)c70srcux 7jy 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).    $m$