Suppose that an object trav53nt7 )luj6 gr 8pnwxap px/bb7j;1ewels from one point in space to another. Make a comparison between the lb)1w73tbp ;jx a7wxj6/5grn n8e pupdisplacement and the distance traveled.

  When is the average velocity o0( g6tbf -tesuy+zs2gf an object equal to the instantaneous velocity?

  A new car manufacturer advertises that thq fma;(crf:z6ni8( /yjejbc,eir car can go "from zero to sixty in 8 s". This is a descrip /6 nfa,j:cje(i;qymrz( 8 bfction of

  An object moving in the +x axis experiences an acceleratpzt16 ij g4g5fion of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x de u0mgd *zdx9hvz1 i/6n k59bnirection) begins to slow down as it approaches a traffic light. Make a statement concerning its accelera/hd5n num9v z0igk*e dbx1z9 6tion.

  Suppose that a car traveling to the xhf 09 oo.fmdpa*, /mbWest (-x direction) begins to slow down as it approaches a tffdh *m.mopb0 a9/ ,xoraffic light. Make a statement concerning its acceleration.

  Suppose that an object is movngncxmxi3m8 7v-;n jr2q2x-s k)0 xkl ing with a constant velocity. Make a statement concerning its an) 2kcg;vxx-lismk 7q-jx 0r32n8mxncceleration.

  If the velocity of an obn kk6c.hxot ktmn.r0mc)3.f 1 ject is zero, does it mean that the acceleration is zero? .k ct1 frn 3k0nmhxt.6o. )cmk Support your answer with an example.

  Can an object's veloic y;2jf wgmb 4)s(mb6city change direction when its acceleration is constant? Support youjym;2wmb)6 bi(c fgs4 r answer with an example.

  Suppose that an object is moving with constant k ifj *k:,1:ati dad,dacceleration. Make a statement cond1a*tk,,ikad i d:j: fcerning its motion with respect to time.

  Can an object have increasing sqt-+s h:oytca, *5pmt peed while its acceleration is decreasing? Support your ans:c*o ,-tya+tptqh5s m wer with an example.

  Suppose a can, after an initial kiur: x8ho 7k5qq1cy/kz ck, moves up along a smooth hill of ice. Make a sta h/k: 5cux8rz7qkoq1y tement concerning its acceleration.

  Under what condition is average velocity equal tolg4fwj na6se-;btf;1 the average of the object's iniaf61;s-wlgen t 4bf;jtial and final velocity?

  Objects A and B both start at y8db a jbosfk7up4 95/rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of objec kf9du/ap y74b5jbos8t A compared to that of object B?

  Objects A and B both stm(:se oxpe1z y/ 7nypog/8er.art from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compare8pyx es/1 oy(ee:p./r7nomg zd to that of object B?

  When an object is released from rest and falls in thed:opb:n b3t1y absence of friction, which of :ybtdo1 b:p3 nthe following is true concerning its motion?

  When an object is releaseca/ zbc6m.54ieqef4cd from rest and falls in the absence of friction, which of the following is true concerning its moec4cz/6ib. e4m5ac fqtion?

  Suppose a ball is thrown straight up. Make a statement about the velocity and mv: ezf6 x)lyq9x 5qd k k0hqkd5s(8; qlxx,p.the acceleration when the ball reaches the highest point p5.x:(q elk8lhkdf ,)dxm5x xk9zqs qv;yq06.

  Suppose a ball is thrlf4+6)3ama qh na q1si9owsz 7nsbe+/own straight up. What is its acceleration just before it reaches its highest point?/nmwsq)zq6+1hnss93a+ioal 7a ef b4

  Suppose a ball is thrown straight up, reaches a maximumf4y a rhuxys;;5di d23 height, then falls to its initial height. Make a statement about the dyxdadh; r52i4 fs;3uy irection of the velocity and acceleration as the ball is going up.

  A ball is thrown straight uc-h0k7t;skxi *y42l fylz 6q9lz t i0 2yd5wffp, reaches a maximum height, then falls to its initial height. Mak0ix 27yy62s-t; l tfczwdq9l* ikzlh4fky0f 5e a statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward i1sn+ 4ufu,wyebm 11 cmn the absence of air resistance. Make a statement concerning its1,mc wufyuse1+nb41m acceleration.

  Suppose a skydiver jumps from a high-flying plane. Whatzl mz.7ysh ,7ta;j+vy is her acceleration when she she reaches tej7lh,tz7 z m+.;sy vyarminal velocity?

  A ball is thrown vertically upward with a speed v. An identical second bal: pi1iaoetax4 : uq/ *lgi/ng-l is thrown upward with a speed 2v (twice as fast). What is the ratio of the maio xn: q-eip1 aligg:/*a4 /tuximum 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 bu 5+bcfylns.:e-dd *usilding. One second later, ball B is dropped from the same building. As time progressesul.: nebys* + s-cfdd5, the distance between them

  Ball A is dropped from the top of a building. One second later, ball B is dropp )j ak6b2bbx)yed from the same building. As time progresses, the dif)b 2 yjxk)b6baference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown up, d;1aqjk1:ig e and the other is thrown down, both with the sa:1gid;je1ak q me initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is t2n j 3vn7ia 0hp)chf+6 gryv3yhrown straight downrv0n i av c f3hh+j2y)763ynpg from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with c6fsa- 1,ps1izp ix vy e9r eynef26.t2onstant non-zero velocity in the +x axis. The position versus time grap1pefste9e6-26v yx f anipzy1rs.2i, h of this object is

  An object is moving with constant non-zero acceleration in the +x axis. Ths7/3hzqps:l ,uor fi 4e positiono i3/ p :luhqs47sf,rz versus time graph of this object is

  An object is moving with constant non-zero velocity in the +x axis. The velon r 80dq:t2zmvje0j:l ly;4ijj(5evs city 0n4(slv0j2yde58z;vqr:tlejj : i mj versus time graph of this object is

  An object is moving with constant non-zero acceleration in the +x axipwpxtzxy-( 1 5s. The velociwzpx 5(y p-xt1ty versus time graph of this object is

  The slope of a position versus time graph gives0:bq pq. 3n*ne9 o;prk htrsc7

  The slope of a velocity vefrbsv 59j4) 7gr7dbhyrsus time graph gives

  The area under a curve in an acceleration versus timer)dk c.etk; 3.liu+zu graph gives

  The area under a curve in wn(l* d0bej6x,rm i: na velocity versus time graph gives

  If the position versus time graph of an object is a horizontal line, tqkm: :sx)ztd 4o69 uywhe object is4o9:wmqsdztu) :6yx k

  If the position versus timenluwl fb7ts,v 5p lb.2m*-;jq graph of an object is a vertical line, the object is 5smp -l2lf vb, jnlbwq.7t*;u

  If the velocity versus time graph of an object is a horizontal line,l5 du5jj j0n(i the object 5l 5jujnid(0j is

  If the velocity versus time graph of an ob.55(kg n nyyrmject is a straight line making an angle of 30 degrees with the time axis, th r(gk. nnm5yy5e object is

  An object moves 15.0 m north and thbk hzfu de7;v4zhy +s,1c0wq ty4*f d5i.uo3uen 11.0 m south. Find both the distance traveled and the magnitude of the displacemen7huts 4vufzykcfu14b 3ioz 5d*e 0ywd +h.;, qt vector.

  A boat can move at 30 km/h in still water. :j uwvxwfido+9bq6 k++xl1 /z How long will it take to move 12 km upstream in a river flowinlwd:/zx9 +xi +1 jufqvo6kw+bg 6.0 km/h?

  55 mi/h is how many m/s? (1 m ve7d/ 9 pw4n+a abff;h)hy9lsi = 1609 m)

  What must be your average4uj;ake65fshj iw),lgb-u2fg/+ylm , +l n cf speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 kmjn 8l9zd8u+ab(dr0 .pq4sp gt) in 2 hours and 57 min. What is the average speed .n8pg+8pt 9lzqusd r0da( 4 bjof the runner in m/s?

  A car travels 90 km/h. How long does it take for it to tramwubg7 s a;za 4b43jvh -fc;o:vel 400 km?

  A ly (light year) is the distance that lnz bb4m;t/iq3y; kwy)ight travels in one year. The speed of lig);; q knb wyz/yimtb34ht 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 6dc1hys 50um yto the side for 4.0 s, how far do 1c5 du0yh y6msyou travel during this inattentive period?

  If you run a complete loop around an outdoor6 hbhgk b-49gw track (400 m), in 100 s, your average v9b-h 6wg 4hkbgelocity is

  A polar bear starts at the North Popkx. 2-a*adtk le. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to rea2k.k- dtx pa*turn to its starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km +*pb3b cv*n9w.zbms vl,pr+ heast, 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 b *+pvbpcbn.r*wmzl 3sv +,9hvelocity?

  You are driving home on a weekend + pp r9zl :;w*n;ospgufrom 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. o *g+wsn r:pl up9pz;;How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What xh- 6q0y 05tr4nvpmzd is the average speedmytdq5nx6p r z4h-v00 of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her ave 9b 76yez,dk )mzq;duirage speed for the trid y6 u9dmi ;),ezb7qkzp?

  An airplane travels at 300 mi/h south for 2.00 h and thenc8r5 cla2ggox6z k7 :i at 250 mi/h north for 750 miles. What is the averager ogcl5agx :2i768 zkc speed for the trip?

  In a 400-m relay race the anchorman (the pejl 26-q a nyj(dub69+,8,nsdclm ke fjrson 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 lea,(s9ln2f l,-jayj+qe 8bd n6dc mjku6d the team B runner can have when the 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 11 s. The car's average vq/,*j7bkizwd elocity during deceleration w*jik,dqb/ w7zas 46 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the averaku /7w1voo-,( ep+r d 2u6bsrmd x.cjbge rate of jeb(c-/2+w,.7rsvr6um ddu ko xpb1o $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerayef2w31 jf q;ctes 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 abfe0 f v(t+m9 -snyemzt.;m 1occelerates 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 o(ttuk n: h9md;g;;b luj)5rmwith a constant accelerationbtnhu;5rgo9();dl j:;k utm m of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 2.8 m/s expbds ezj6;k r02zhcr7u *e6e,periences a constant acceleration or2sh b;e6dru6cj7z e*pe kz, 0f $3.6 \; m/s^2$. What is the cart's displacement during the first 4.0 s of its motion?

  A bullet moving horizs lxcv:sr9 1vn1j4 z9yontally to the right (+x direction) with a speed of 459 m/s strikes a sandbag andy :l 19x1sjvs9zcr4vn penetrates a distance of 57.75 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched d e6m3ek wj:z(from a catapult 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 is the length of the cata6emw:3 d zj(kepult?

  A car starting from rest moves with constant acceleration of qyqk o8,ortrs(t )3s5$2.0 \; m/s^2$ 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 aver ,epeq 96hmz(gage acceleratizp (,gq9hm6eeon?

  An object starts from rest and undergoes uniform accelerat5o .e mkttt tpmtia.5537 yul8ion. During the first second it tot5ei5 kt3 a 7m y.mtu85tpt.lravels 1.6 m. How far will it travel during the third second?

  An object is moving in a straight line .8wupj4u (p ,+ /ku 5reudb1cvwzqhm7 with 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 this tuku7. w/zmec 8( p, uwuvb+r1pqh5d4jime?

  A car starts from rest and accelerates uniformly apssi/ig3vz:.7 n+f tuz(p*(;wbcqgrt $3.0 \; m/s^2$. 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 g6 ro,bk /9drp i,/jk(v;znpo 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 d6xh 460td.b ,ggnjbp waiting at the intersection starts ahead with a constant at,db j. 0xd4 nh6bgg6pcceleration 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 thl7g d (ryo0pyq. 6j *g2j(kfhme surface of planet X where the acceleration due to gravitjp (yk 2l.j7yfm6*droh g0(g qy is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upwar)d awx6klk)6 cl(hwq.d with a speed of 12 m/s on the surface of planet X where the acceleration due 6 akq klw.( hd)lw)x6cto 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 s;j (q(8pti v sw7ktam1urface of planet X where the acceleration djsat81 t7 (qpw;(vkmiue 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 surfac1ca00q ,y(ezznyuhu6 ue-w +n e of planet X where the acceleration due to g,1(c zwyyu0 qan6+-0ehenuu zravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually p*-i go:ujlv 3greater than 0.10 s. If your friend holds a ruler between your fingers and releasesgju-:* v i3lop it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.61 ur* uvz;qa: nr h.-tl4xb6ib m/s. What is its velocity after 3.00r.r-4x v tu6in*qhulb1 :a;zb s?

  A bullet shot straight up returns to its starting point in 5 s. What is 9hyu7cd/f : fwthe initial d h/7wyfcu9:f speed of the bullet?

  A ball is thrown stra /7x03gfij 5d:xuh lz62iw xcyight up with a speed of 36.0 m/s. How long does it take to return to its starting poi5wu2 0gdz6yi/7xx3jf x ih:c lnt?

  A ball is thrown downward from the top of a building witei1(*,kkvme g 9rcd p1h an initial speed of 24 m/s. It strikes the ground after 5.3 s. How high is the builpei9 g m(r v,kedc11*kding?

  A ball is thrown straigh((kvpl +-sqqe.bf8 s *g+szlet up with a speed of 30 m/s. (only fill in numerical value in the blan(vekl +*glsbfqsqz8p( -.+e sks)
(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 straxay5 ba.*;.hdnqjuy6ight up into the air with a speed of 22.3 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 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.xgu )c,y/:edd*w t3hg 0 s?

  In Fig. below, what is 8 ;ysdi la*wa3the velocity at t = 2.5 s?

  In Fig. below, what is the vef+fd1r b,mx ,fd,egl* locity at t = 4.0 s?

  In Fig. below, what is the veloesknk,l 37; b :+ 2omifr7rf5(jyej recity at t = 5.5 s?

  In Fig. below, what is the ave9, o5hlldiqm9 rage velocity from 0 to 4.0 s?

  In Fig. below, what is the average +xpt up2l*po1(lbw- rvelocity from 0 to 6.0 s?

  In Fig. below, what is the acc gw.xgk1 :lf4ieleration at 1.0 s?

  In Fig. below, what is the acceleration at 2j9ycoch.prd*x ;c 9x 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5ebii,6xu1h rox n3*i1ovhl)8,c 1fv w.0 s?

  In Fig. below, what is the average acceleration from 0 to 8.0 s?-l, gbirlvas/94+ioo

  In Fig. below, what is the displactpzm n:2n 9i2a4lsx 7lement from 0 to 8.0 s?

Does a car speedometer measure spees qbcm2 oh9o1: jwka/2d, velocity? {speed|velocity}

  An object can have a varying speed0u77c*yyyrw;ul o3 s d if its velocity is constant.

  The velocity of an object can be negative a np6w2hyhi f0 ;vg/x4h2 ii.qwhen its acceleration is positive.

  If one object has a greas9:k k+ e-mfjzter speed than a second object, the first must have a greater amzf kjes9+ k-:cceleration.

  Two cars emerge side by side from a tunnel. Capnjo3/sco 5(: 0kagzy r 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 increasinqf7i2. v*,o6z oiygp eg in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leu(rx*wic +ry)z p:j r2aves the bat with zwu2j+:(rpx )ycir *r a speed 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 go.*chg h5uf-h1m ep 8 hfos9/is happening to its acceleration, how doeo8po 9 -.5g1 h*hm/uch gfhefss it change if air friction is ignored?

  As a freely falling object speeds up, what is h4w;jjrf;; hhvz2q u,vappening to its acceleration, how does it change if air friction CAN NOT uzwrq;jhfj2;hv4; v, be ignored?

  An object that is thrown vv 8-4xn cjfw7 -ja czi40awgq+ertically upward will return to its original position with the same speed as it had initially if air resistance is negligible. Iwjc0-az44 f8 a cx7n iwvjqg+-f air resistance is appreciable, how will this result be altered?

  An object can have zero velocity anyk .g kj*)l(g zhyih*,d nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acce :jf9*aqo 9spoleration at the same time.

  An elevator moving from the second floor to the fifth floor making no stopsd;d1b+m g a:loz96 )jybacq5 g along the way has zero acceleration all the y61aq c ;)b+:5dobajzdg 9gm ltime.

  A rolling ball moves fromr p2hgi9(4ubm $x_1=1.7 \mathrm{~cm}$ to $x_2=-6.4 \mathrm{~cm}$ during the time from $t_1=2.9 \mathrm{~s}$ to $t_2=5.5 \mathrm{~s}$. 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 $t_2=3.8 \mathrm{~s}$ is at $x_2=8.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a n zvw:,.x. nxjgmflq7a,2 3gequarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 11.6 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,p77 60mir cogz:+5se truh n5h moving 105 m away in 9.:5i urte oshgm0zn hcpr7+6 752 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 frij8h vwwa+/9,.n:h ll 4vtsay om $10 \; m/s$ to $25 \; m/s$ in 4.4 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 ; / g/r4nsym6 mvxu fbrm0n1u0$20 \; m/s$ to rest in a distance of 76 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed o2ug 9dk *at1 (k+iqdmgf $29 \; m/s$ 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 blocks to essent2b v,(qmu-x 8;*ngdx cubrff:ially top speed abou *,qcf;2(xxdnbgmur8b: vf -ut $10.6 \; m/s$ in the first 13.9 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 sfty a up..5sqa.c(s* enaes*)peed of $16 \; m/s$ to rest in 5.28 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m5fgkq1)i ivi(4kic b) long on the highway. Assuming a deceleration oi5gkq bkf ci(1ii4)v)f $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goibm6p0 .i12gk 8vw;htyt hbr0a ng $25 \; m/s$ 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).    $m$