Suppose that an object travels fromc+mn4vdq; gpbva/q6 9 one point in space to another. Make a comparison between the displacement and the distance trave c ab46p/;mgqdnv +9qvled.

  When is the average ez q3 hh; b :lgj847g-2sqtuzoaktg3v))u1mdvelocity of an object equal to the instantaneous velocity?

  A new car manufacture*d9dblw5x) dm0qxwdb7 /0yxl r advertises that their car can go "from zero to sixty in 8 s". This is a de dwb9ldd/mq 5*7yx xl0wb)d0xscription of

  An object moving in the +x axis experiences an accxrx6*) :zn 8r4zpijttb59z :bnj,jhkeleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x directio;iv9 c4qs tl2b.m-qaqd yij/+n) begins to slow down as it approaches a traffic bi4qj9.d/qiq v ;2mt+-y lasclight. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x directionto4 h hae)h+k;) begins to slow down as it approaches a traffic light. Make a stateme hh4th;)k oe+ant concerning its acceleration.

  Suppose that an object is moving with b vmovjoag,*t;: a s b1m.+2dda constant velocity. Make a statement concerning its accelea d;1b+ *,m2dsba gto .vvom:jration.

  If the velocity of an object is z t, kfkabuh5q(4j7(l-7dosc gero, does it mean that the acceleration is zero? Support your answer with4qkb-sl g7dj(c otu5hk7 af,( an example.

  Can an object's velocity change direction when its acceleravdr)( mwwrvj-la /n,uvtdf(-4zw)s6tion is constant? Support your answer with zfs w/dv(vw ,urj4)d - rv)la-nw t(m6an example.

  Suppose that an object is me+o9;pgxd(j05 (5tctp exdqp oving with constant acceleration. Make a statement concerning its motdtj0(tp595gp qoxec + x;p(ed ion with respect to time.

  Can an object have increasing speed while its acceleratiuvo.v f-;xgq -on is decreasing? Support your answer with anvux- -f g;q.ov example.

  Suppose a can, after an initial kick,0 mm-wu)5venki)se )y moves up along a smooth hill of ice. Make a statementi)) m eknsvm0w5- )yue concerning its acceleration.

  Under what condition is average velocity equal to the average of the ob:c hh4x o9d3yxject's initial and fi4hy d9c 3xx:honal velocity?

  Objects A and B both start at ct/iur)cd x/8rest. They both accelerate at the same rate. However, object A accelerates for twice the time as objec) tdx/8c cri/ut 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 ay*gw jhmlae8fp-*t7 xtn7 (3n ccelerate at the same rate. However, object A accelerates for twice the time as obj jfy(l 3wptxh8g7m* 7n-n ae*tect B. What is the distance traveled by object A compared to that of object B?

  When an object is released from rest and faksfk +69aig2 mlls in the absence of friction, which of the following is msg6ikka 2+9f true concerning its motion?

  When an object is released from rest and falls in the absence of friction, which:9xkj zfx+f:/v34s(d(sn w p:f wjnda of the followivf3 pds:sf(wa/9kdfz (x+x nwj jn::4 ng is true concerning its motion?

  Suppose a ball is throwng37jps*p /lc o straight up. Make a statement about the velocity and the acceleration when the ball reaches thes*g3p joc7p/l highest point.

  Suppose a ball is thrown straight+ u*md 6mbwwc* up. What is its acceleration just before it reaches its highest point?b+6c mum**wd w

  Suppose a ball is thrown straight up, reaches a maximum height, then falls to it y70 sml6.5n 6- den cc.yh1eyhi1oruks initial height. Make a statement about the direction of the veloci sl0-cen.yymcheh 6 y.r1o7i d n6u15kty and acceleration as the ball is going up.

  A ball is thrown straight up, reac j+*xrbb1w9j xr8* lhbhes a maximum height, then falls to its initial height. Make a statement about the direction of the8* r9x+wb*lbj rj xhb1 velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absenr*)1 (hqxyts+q wt1 u1;nereo ce of air resistance. Make a statement concerning ro) nrtwe1uetq1;yq*(x1h s +its acceleration.

  Suppose a skydiver jumps from a high-flying ev l5hv,.uf*1mce ;vdplane. What is her acceleration when she she reaches terminal velov,*; dvelfhve um1c. 5city?

  A ball is thrown vertically upwc+jnyy x;vf.a,m 81kjrpu ,g.ard with a speed v. An identical second ball is thrown upward with a speed 2v (twice as+.,vcxan8m ;y,jyk urgpf 1. j fast). 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, ball B 2sf:txath o3 qp 0*i,pis dropped from the same building. As time progresses, the dit0qh,pot:x* i2sa 3pfstance between them

  Ball A is dropped from *+:m1u0 bqljlxm 1ihd the top of a building. One second later, ball B is dropped from the same buiblld ui1 1 :j0+q*hxmmlding. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tsvwjuu6pg1h)3 0y9ih all building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their 91gij3s p )wvyu0hu6hspeeds when they hit the street?

  A brick is dropped from the top of a buiidnduytti47 qv /c3 2(lding. A second brick is thrown straight down from the same building. Thed7y iu(4t2q/3nc d vtiy 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 in the +2ang o74j5 7p 4+ey 288hukspngfzg box axis. The position versus time graph of this objecsk ggb+2ue78po4 4a27 n8gzp5h yfo njt is

  An object is moving s rfg:)ygf;0;wg8vlmtfvt3 2with constant non-zero acceleration in the +x axis. The position versus timl0g t;y)fwfm :v2rvgf;ts38 ge graph of this object is

  An object is moving with constant non-zero vwjiaysrsue fq4*14pf5s0 2;u elocity in the +x axis. The velocity versus t0iq2w 4*frsuysuf ;aje1 4 s5pime graph of this object is

  An object is moving with constant non-zeotjcg(3( /1n9r o:a wsq5zx xtro acceleration in the +x axis. The velocity vex/saogzt9r3 co wtj(q 15n: (xrsus time graph of this object is

  The slope of a position versus time graph 1kde)bab 4:ko /rxw d(gives

  The slope of a velocity versus time g*a: t7dv;by mbraph gives

  The area under a curve in an acceleration versus48ocp c-r5sq q time graph gives

  The area under a curve in a velocity versus time graph gives /uy7-eq*y.zlhasy eq-s2ic br/sr * /

  If the position versus ti3 g g6;yy obd5eg+f 0khmqqp1.me graph of an object is a horizontal line, the object dyf0p;begoq5gm.hq 6k1y +g 3 is

  If the position versus time graph o fqrrc60ai:j8f an object is a vertical line, the object is :i8r0r6cfj qa

  If the velocity versus time grap2:mor dicq5,y 58nwp(sp bwn2ne c1 .vh of an object is a horizontal line, the object ipp o5rn2, 2.sdiycvnn(:8e1mbc5q w ws

  If the velocity versus time graph of an object is a straight line : iydr3+i*l t l 5zn):oti9elymaking an angle of 30 degrees with tltoz+: 3d e:ly n5 riiyt*)il9he time axis, the object is

  An object moves 15.0 m north and then 11.0 m sout4k k i24nu8txbb9yk *91l isesh. Find both the distance traveled and the magnitude of the displa l i9x yitkk*b4bnu2s1sk9e48cement vector.

  A boat can move at 30 km/h in still water. How lon6x89 ub qu4puwx 3p;fqg will it take to move 12 km upstr bx;u9p6uq3qx 4uw pf8eam in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 ; b4m3zis8ai42 gyndb mi = 1609 m)

  What must be your average speed in order to travel 3r7c0;f/fey: unr m ;o8;wraqo50 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hoursp hnyb2qgu 4gk) 5fyxmh))kh8 rng7 v59 (4kab and 57 min. What is the average speed of the r(72g gfg)rh9hx 8bnp)qh 4)55vy unk k4bkma yunner in m/s?

  A car travels 90 km/h. /rxdd+e)3y g :j6 o,+ zqmcghn,fx2t bHow long does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one+w+j5bi,m wzn year. The speed of ligbznwiw,5m ++j ht 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 alont+xlb+hl f:, x3iz,mkpv 1ph.g a straight road and you look to the side for 4.0 s, h h:mkxp vbxt+l,p1zl3i.,f+ how far do you travel during this inattentive period?

  If you run a complete loop around g)zhujd,h ro4c-u/; ian outdoor track (400 m), in 100 s, your average velocity gi h,jdr 4uzh)-/u ;cois

  A polar bear starts at the North Pole. It travels 1wkkb54m*zgon /3.ghl.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 be z klmh.o4gb3g5wk/ *nar's average speed?

  A polar bear starts at the North Pole. It travels 1.0 m8phby xestas75n6 54 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west n5pyh 5s74x6mtsea b8to return to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend fropa:i gcw- *v:f/+ )un1honw ztm 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 fai tn:a u:f zn+-*/1)ww ocgphvr is your hometown from school?

  A motorist travels 160 km at 80 km/h )-1iq yz-njwhand 160 km at 100 km/h. What is the average speed ofqijz-n1h )-y w the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 q fj9ur -(xb/9*ebvp akm/h. What is her avera*bbu/-9 x vfae(qj9prge speed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then z(i/ tgwcmj47 at 250 mi/h north for 750 miles. What is the average speed/ 4m7j( iztgwc for the trip?

  In a 400-m relay race the anchorman (the person whrgwf r59 3xhmh 5kfp6+l3j;y ro 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 f3;h l3gr jxhr5 9fyr6wk+m5p team A runner starts 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 13 s. The car's average l2 x/e m6-tqgf4.ldwevelocity during deceleration was 35 km/h. x-w dmf2l.4/t 6 geqle What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at.36rqr w9khrlr4q/ r2yv3s ;tsr/hwq the average rate of hhr6;s3rrr rq2qrwls y4/k/t 3v q.9w $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate rh+ny:19z xfk 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 ,y i 7k6ing3vkand 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 speeds up with a constant acceleh x;n 5 yfux.fm4w6h6/4bt qunration of w/xnqh6tbn.u6 5u; 4yf xfhm4$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 5.9 m/s experie kvwtnj1(su8t( bmo +3nces a constant acceleration of1jtkb 3 m(tvown8s(+ u $2.6 \; m/s^2$. What is the cart's displacement during the first 4.8 s of its motion?

  A bullet moving horizontalh dmkeggc,+13.xw rj7 ly to the right (+x direction) with a speed of 243 m/s strikes a scg.1g3+wj,mx er h d7kandbag and penetrates a distance of 48.95 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a cataph.y(52 xd, xe:nprk1e.c+gmr3d r bfqult 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, what i(drrc3he f+mxy, p 2 dq..gx1:rbn 5eks the length of the catapult?

  A car starting from rest moves with constan bnpy9 i)toz- r;61ecnt 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/pb3gv) z4e4h87 mn tcfs to 80 m/s in a distance of 200 m. What is its average acce f3 b)cn 74ztp48mhvgeleration?

  An object starts from rest and undergoes uniform accel nqkpghs1 z )cx)e .9wd(w9x-geration. During the first second it travelsz-)h9 egdgncs.(x wp9q wkx1) 6.1 m. How far will it travel during the third second?

  An object is moving in a straightn-+ nifxpzb39p-k2+iv +xvwd line with constant acceleration. Initially it is traveling- p pxnd f vb+xvi9+zn-2ik3+w at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniforna+k0l)bf(cf a , qen gm.+(g j,y8iwemly 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 at abou6cn0kj8 v of7*4kg zz3o6yu cdq 1lmj;t $5.0 \; m/s^2$ 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 waitpn--h5gp1k0 g );ychwrx s8 hhp2ehr 6ing at the intersection starts ahead-61knh2p -eh 8pwggs5 h hyrph 0);crx 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 ;g7i 1 8otgevmthe surface of planet X where the acceleration du;1v7 t eggi8moe to gravity 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 surface o rn4/ptkv1ono-ks4w 04vn s s3f planet X where the acc n 4krvok vn-4p3t0oss1sn/4weleration 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 on the /-v/lkx; flh. 3tvzgksurface of planet X where the acceleration due to -vv.t/ lk3h ;/ fglkzxgravity 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 6q e l une7:yi)90byzn14 m/s on the surface of planet X where the acceleration due to grav7lyi9en u0: bezy n6)qity 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 your friend holds a rulz6f :6* fuszqner between your fingers and releases it withou q6*: zfzsn6uft 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 velo58r6up sop2td o)i:w ux*mc 4scity after 3.00 2dws*c8it m45 u)up6x or:s ops?

  A bullet shot straight up retu2yj0dewrt ,z) rns to its starting point in 19 s. What is the initial sperw j z02e),ydted of the bullet?

  A ball is thrown straight up with a s8xhxj0dt rf++do 78wi peed of 36.0 m/s. How long does it take to r7d+ jox 8d8+0rh xwtfieturn to its starting point?

  A ball is thrown downward from the top of a building wixh+ohie -g k55th an initial speed of 7 m/s. It strikxh +i5eh5kg -oes the ground after 2.7 s. How high is the building?

  A ball is thrown straigog6;5il xbm 4zht up with a speed of 30 m/s. (only fill in numerical value in the blanml6 xz4bi;og5 ks)
(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 alzr 5;nd ss0ib6zc u.1ir with a speed of 44.5 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 7 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 7.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1.0 s*e dq8m7ty(ng?

  In Fig. below, what 8 j2dryas*,w pis the velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.lzl8 -9 whq4d tw.ahm/0 s?

  In Fig. below, what is the velocity ate mv; e6;/ -p:6buc5;w:y nfsurl cxh3guu/rd t = 5.5 s?

  In Fig. below, what is the average velocmim 74a0 8tzrzml8v:rity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6.0un 79 opt(d)wit:8nt8n lab5h s?

  In Fig. below, what iz+- xl :qomre;s the acceleration at 1.0 s?

  In Fig. below, what is thesi. c9)h yfka3gv/lpr g28gy 9 acceleration at 3.0 s?

  In Fig. below, what is the average acceleration f0pj ou3nem+c,(9mvv r rom 0 to 5.0 s?

  In Fig. below, what is the avxi 8 u-)d3 yx, wr2dl5d8d k3s-mjjcieerage acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8.0 s?pl6l7 hjqewk9xps f(09a ,i:f

Does a car speedometer measure speed, velocity? {speed|velocjdulpjc*.*+ vb1har +ity}

  An object can have a varying speed if its velocity is 2xd1cx b -jik0constant.

  The velocity of an object can be negative when its accelerationp/qg7rjk-z9ip )ukn .,x /usw is positive.

  If one object has a greater speed than )ss 34towlpv- a second object, the first must have a greater acceleratio3op-vl s w4ts)n.

  Two cars emerge side byh 0rfnjip61j5f4k1 zh 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 increasi 5) q9:4cn,q ;:w aozew/ muepvsnsx6zng in speed as its acceleration decreases.

  A baseball player hits 1s / +h1bwacrba foul ball straight up into the air. It leaves the bat with a s brbs /a+ch1w1peed 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 speedul yxxy-*zw+i*c2r v q0,kqw 8t3py p6s up, what is happening to its acceleration, how does it change if air friction iwp 6xku280yxi vypqwltq3 r *y ,*z+c-s ignored?

  As a freely falling object speeds up, what is happenin vzdp;*i65h bsg to its acceleration, how does it change if air friction ship;5 z*b6dv CAN NOT be ignored?

  An object that is thrown vert9ssmut 5 zz nx3zn53g0ically upward will return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this resu05z tnz ssmu3 3n5zgx9lt be altered?

  An object can have zero veloj0 ;6c)zzb xm 1poty*mcity and nonzero acceleration at the same time.

  An object can have ngjk0j )sh-8( n6waj uuonzero velocity and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making nodp4 f6raiyv 60 stops along the wayy6rvfdp i4a 06 has zero acceleration all the time.

  A rolling ball moves fro33 6wvwuwx)o hm $x_1=1.7 \mathrm{~cm}$ to $x_2=-4.9 \mathrm{~cm}$ during the time from $t_1=2.6 \mathrm{~s}$ to $t_2=5.9 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.5 \mathrm{~s}$ is at $x_1=2.4 \mathrm{~cm}$ and at $t_2=3.2 \mathrm{~s}$ is at $x_2=7.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around t+ 2 iztskf/pw glg-5rqq35 agzb;1n :a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 10.6 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,q3g 8yj.a-bu bd)se1r 4flrq- moving 114 m away in 10.3 s. It then turns abruptly and gallops halfwayg4 q e 8r3-ba.1jrsldq)uy-fb 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 frlh720 tm1m .gej bv7bq jqnq 5yopo;,7 w0)nsvom $12 \; m/s$ to $24 \; m/s$ in 4.2 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 from8a;gpwqjlep;cqhj- ( u ;d/)s $18 \; m/s$ to rest in a distance of 81 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed of6f71 io::0ybx rcgn 0l x x;c4eb8cuol $31 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.6 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter cak.y0k)oxsh4* k xnygik 4+ 3kyn burst out of the blocks to essentially top speed about yokkg +i.0n y kk3y4ksxh)*x4$10.9 \; m/s$ in the first 11.4 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 hpdm) n-/ wny:ugp5 gg7i8in:a speed of $20 \; m/s$ to rest in 4.64 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 6a910b (lnrs .jcmgxt the highway. Assuming ( 06bca1nj 9 rsmxlg.ta deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trucmb7vr rwy3cq/z+ (i*gk 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).    $m$