Suppose that an object travels from one x*tt d2,:j9hq kjncd9point in space to another. Make a comparison between the displacement and the dhq :9j k,c*ndt9xtj2distance traveled.

  When is the average velocity of an object equal to the instantaneous1cq,0)t pxwjl8 nh7ut velocity?

  A new car manufacturer advertises that their car can go "from zero to sixtf87t2dkx3wv4szh dd0yznz 38 y in 8 s". This is a description o x v3t7whk d0s4z2 yz838dfzndf

  An object moving in the +x axis experiences an acceleratixjs g x00ox8p8 zn20zeon of $2.0 \; m/s^2$. This means the object is

  Suppose that a car tra + ydf-5hfdsd.veling to the East (+x direction) begins to slow down as it approaches a traffic ligh+dd.5- f yfdsht. Make a statement concerning its acceleration.

  Suppose that a car traveling 7jd7rjy6f808 icaxa o( /dnm gto the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acm0ycrx87 j( ajifdg8n 76d/ao celeration.

  Suppose that an object is mo+pti4* 2 dqs. p*u 0 gkwa9y8p8yepldwving with a constant velocity. Make a statement concerning its acce 0 kwpp 8ted ws4g ypa92q.*dipy*u+l8leration.

  If the velocity of an object is zero, does i 3vu znu/(fdx. -m pa0)wov6awt mean that the acceleration is zero? Supuw-.0zx6 amvp( du fnaovw3/)port your answer with an example.

  Can an object's velocity change direction when its )s z 4vxpf:yn.dkb0ie9 z9xhp/(*y kpacceleration is constant? Support yourp ph/x(e99 .:z sif4zxyn)*yvk d pkb0 answer with an example.

  Suppose that an object is moving with constant acceleration. Make a statemed(9mnbmqh-8 y nt concerning its motion with respect by-( 8dmnhq9 mto time.

  Can an object have increasing speed while its acu0vld,jr 8( ()qurkj xceleration is decreasing? Suppoulxru0 )vr( (kq8d j,jrt your answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hilsbdf0x 1t: fq3l of ice. Make a statement concerning its accelx : f1t3db0qsferation.

  Under what condition is average velocity eq;3,g-sqaulm3 3xfmmp/s* (zd yrt4r a ual to the average of the object's initial andtzxf*q l(g 4rm3raa- ,/3p s;m 3mydus final velocity?

  Objects A and B both start at rest. They both accelerate at the same r- 88rc)han r9bhj+ikqate. However, object A accelerates for twice the time as object B. What is the final spee8 achrn-8k9h)j rqb+ id of object A compared to that of object B?

  Objects A and B both start from rest.f(-ls*9pn uxtd:21oj hfzb7 m They both accelerate at the same rate. Howeh9ulx2m (d b ft1*p-n7z :ofsjver, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of object B?

  When an object is released from rest and falls in the absence of friction, wi * 3 8:63yp4jd wbte9qlfyg-mv6iqzqhich of the f63 dvqe9q*qj 3pitlg4yw6 zmby:f8i- ollowing is true concerning its motion?

  When an object is released from rest and falls in the absence of fru*w q(t;cy 55bijn mpq-ea/-tiction, which of the followingic;q/ j-t5 5tq- em*bpnw (yua is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the veljdl3vc;k 1oh,h,: 23ok8: k 1kwrmhnmg wd6dkocity and the acceleration when the 3k2vj6kkh:md8wc;odkhdnlg3 o 1 rw kh1m ,,: ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration justj (biat3w g8z r4i.65qi .ipts before it reaches it 5q3ttii wb(4r 6i.ijsap8gz.s highest point?

  Suppose a ball is thrown straight up, reaches a maximum height, then fall(po*w(uf/ gk e8fq+ uss to its initial height. Mak8uw/ f*kpsfu +( eoq(ge a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to its inivqfb 0+ ge.*x/,kpyov wou5d6tial height. Make a statement about the direction of the velocityo0vbfk w6q5 xvd + *pe/,.uogy and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of aix:97o ckb ila(r resistance. Make a statemenlxk(:bc9oi 7at concerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is il.ft w6,dhco/; w-hw her acceleration when she she rei,dw6fo.w h hcw-t;l/ aches terminal velocity?

  A ball is thrown vertdcr5(s d:zd 1hically 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 that of the first ball? (How many times higher does the second ball go than the first ball? (c:d15ddz hrs)

  Ball A is dropped from the top of a building. One second later, ball B is moc br/adw)2 ;s,dwobxg+lm:f-mc 49 dropped from the same buildinwo cwomam)r, ;b9d-lgb:4m/sc+x d2f g. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second later,khn* y fy :i7lsmd++l: ball B is dropped from the same building. As time pi h::7f+s*myl+k ydl nrogresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrownf*cuk7)0ukk j6l 5dbf up, and the other is thrown down, both with the same initial speed. What are their s)ckjb5 u uf6f*7k0dlkpeeds when they hit the street?

  A brick is dropped from the top o snsdzhz kvi,z .3r* 0ja6e3z*z r31kef a building. A second brick is thrown straight down from the 0sz31,3d zijvh 6rk.nzeea k*rz3z*s same 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 in the +x axis. The positl.(zq,c g vqrsm6r+u-r:y c.dion versus time graph of thiysc, dm.6lg r (r+-quq.:cr vzs object is

  An object is moving with constant non-zer *y+eog-7frzq uih-n,o acceleration in the +x axis. The position versus time graph of this object ioe nq- * gzhru-+f7,yis

  An object is moving with constant non-zero velocity in thzpu/tccqq55fph7* 2f e +x axis. The velocity versus time graph of this op5pfh* /7uczqf5 qt2cbject is

  An object is moving with constant non-zero acceleraix 3j 4u*oasv 2;wwwq7tion in the +x axis. The velocity versus;2 v7o4sxww3wuqa ji* time graph of this object is

  The slope of a position versus timeix(;g)ns .: g-qbrqn q graph gives

  The slope of a veloc9hu:clmdp8rmvb72d-ph i1b8zs v/ ;yity versus time graph gives

  The area under a curve in an accelerationrl zcw 6qthwolx78):) versus time graph gives

  The area under a curv:gslp6 tte, n7jzx+ze03ik5ue in a velocity versus time graph gives

  If the position versus time graph of an object is a horizontal line, the objec8vnw k5;upo5r 1.q n,2bugvcrt i q;5nwu5kcv bn.v gru, 8or2p1s

  If the position versuk6ecur+r;e 1ua/s mi -s time graph of an object is a vertical line, the object ises-6ce ka um;/u1i+r r

  If the velocity versus time graph of an object is a horizontal line, thefaw+4w:rck n: object ica+4wkn w ::rfs

  If the velocity versus time graph of an object is a straight pw8 w+)3n+ ydztksfw o/ef *f45+lsbcline making an angle of 30 degrees with then ys ske38+wp wb5z+ctlf+ *w) 4fofd/ time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. c7,vk*fc ,fyv Find both the distance traveled and the magnitude of, fcvfk7 vy*,c the displacement vector.

  A boat can move at 30 km/h inu;vqm +uc r6cph/39s g still water. How long will it take to move 12 km upssc3 ;cu6m+ grv/pqh9 utream in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = .k4q+ezv;e nv 1609 m)

  What must be your average speed in order toz.v1z+g-x 7p 9qjq svd travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km i3kek ;av5p:b0z 6vat) in 2 hours and 57 min. What is the average speed of thek a vk: 6av305pzbi;te runner in m/s?

  A car travels 90 km/h. How long does it take for it toovhc*a /mj1tl4)b*rz travel 400 km?

  A ly (light year) is the distance that light travels in one year. The speed g7c hzr+og7) iof ligr7g ocg +hiz7)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 along a straigd76t 6a7ynvo0b wkk9i/ dk2o iht road and you look to the side for 4.0 s, how far do you travel dkd0y6 /2kvkio 76abwdti 9o n7uring this inattentive period?

  If you run a complete loop around an outdoor track (400 m), inp /a rpz.l/nl6 100 s, your average velocity i/p a.6/nlrplz s

  A polar bear starts at the North Pole. It tr0e ux+p2(iggxdg wd+ 3oxqp-9avels 1.0 km south, then 1.0 km east, then 1.0 km norx- xdogu(p dw9gei302 xp +qg+th, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the No-(pta0p e3 :exe :w(b ayfro9qrth Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, th:boxf0q9:3 a(wep e(etrp y a-en 1.0 km west to return to its starting point. This 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 110 miles. It t;(-n cxblakb+1ndq + dhen starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 1db (- alknd;nc 1x+b+q5 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. Wb e/2hczd,zv7+xgp 2jdn6h4 yhat is the average speed yd b g42z,+2x hzvnd6 ph7j/ecof the motorist for this trip?

  A motorist travels for 3.0 hrgy:g(n(jo8v /t b;k h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the tri:b(rg8 yk/t vj gn(ho;p?

  An airplane travels at 300 mi/h south for 2.00 h ando2;u *8h,jsahl h stp. then at 250 mi/h north for 750 miles. What is the average speed losutsh,;2a*ph.j h 8for the trip?

  In a 400-m relay race the anchorman (the person whog,mct fle5 p+( 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 the team A runner not l5+ e p(cflm,tgose the race?

  A car decelerates uniformly and comes to a stop /eimom /7-grk,aj0 snafter 9 s. The car's average veloci/krgomm, ej n70sa/-ity during deceleration was 55 km/h. What was the car's deceleration while slowing down?

  An airplane increases its spe(ktc lij030nkh*ad fqj,cj)9 ed from 100 m/s to 160 m/s, at the average rate of knc c9,j030kjidj)lt q af*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 9pj b2o5f ccdosx 3:c 5*uuc,brate 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 a)ziopr y:( .jjp uo21)bifq.zccelerates 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 a. dtgw29g w3rtcceleration t93 wgr2 dtwg.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 7.9 m/s exwz6/su pq6izp8v o*uq*ae ,*uperiences a constant acceleration ozq8i uepua /p z,so* 6*q6w*vuf $2.6 \; m/s^2$. What is the cart's displacement during the first 6.1 s of its motion?

  A bullet moving horizontally to the rightb2l6+2) sylrew dvd r /yiwn6+ (+x direction) with a speed of 201 m/s strikes a sandbag and penetrates a distance of 36.17 cm. What is the2ld yy vw)s2i+rr bwn+e/ 66dl average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catap3d1f ,1x7wk8qbn )fi 2czwxpwult on an aircraft carrier. It reaches a speed of 42 m/s d ix ,f78pb3k x fc)zqwwwn211at 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 accz(j wg;x8v+ x3cx,u xdeleration 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 distanqjfu pd,c9 d2+jo(d n8ce of 200 m. What is its average accelu jf ,c+j2qdn pdo98d(eration?

  An object starts from rest and undergoes uniform acceler vv3han0 jse.6ation. During the first second it travels 9.9 m. How far will it t h63evv0 jasn.ravel during the third second?

  An object is moving im(kmci8 :l1o jn a straight line 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 thmkij(cml :1o 8is time?

  A car starts from rest and ack1 :h,hi+- s;dgs gizjuo0wb+celerates 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 oyj m5:o4+ zv ojy./wzhn a 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 turns green, a car that has been waiting at the i31nls 8pe yea(6:cqwjntersection ylepwc8 (jn63:seqa 1starts 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 surface of planet ;y; z7o:qfkqv X where the acceleration due t qk ;:;ovzqy7fo 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 of:3efsdhy5 m p ire;n* (ld0hd9;)pwrx planet X whee lrwp:f; r)hd5ys03i *;phn dme (dx9re the acceleration 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 z yr)1nrl8vlivj pu,bc(-5e 1of 15 m/s on the surface of planet X where the acceleration due to gravity i8 rriu -vcbn p5ll1y,)zjv1e(s $2.5 \; m/s^2$. 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 surface o kyhn6 9)k8irpf planet X where the ack n)8 6pkhiry9celeration 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 greater than 0.10 s. If your friend ho8l *r iqte56vmlds a ruler between your fingers and releases it without warning, how far c q*e5vimt6 8lran you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of:;d.-k-y(sa qm7i 9n lphpjqe 19.6 m/s. What is its velocity after 3.00 ss;d7(9a-epm- yinql h kq:p.j ?

  A bullet shot straight up returns to its starting point in 11byoaz gy x597; s. What is the ini;97gx5bz oyaytial speed of the bullet?

  A ball is thrown straight up with a spe:vc js96m im+med of 36.0 m/s. How long does it take to return to its starting9mvj6ismm+ c: point?

  A ball is thrown downward from the top of a building with an initial s( bhbv+t6 nowjnhne3+x1 g5;speed of 29 m/s. It strikes the ground after 2.6 s. How high is th 3hhtjs(n+nno b;+g1w 5x6v ebe building?

  A ball is thrown straight up with a speed of 30 m/s fzb-8i312t 1gfpdm 4ys pohn/. (only fill in numerical value in the f fn14g-28piy dzst3h1/ bmpoblanks)
(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 ,6de ;roni5 ;tel e) (bkg2pxsspeed of 29.6 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 5 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 5.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the lws3lx1if59 naz5 yh2 velocity at t = 1.0 s?

  In Fig. below, what is the velocity aturn /-t ysh.p5v/u sc43lo *tt t = 2.5 s?

  In Fig. below, what is the velf ql lc lywrbo g48)d6tq3q k.gx6y6ej3t/5h9ocity at t = 4.0 s?

  In Fig. below, what is tqobvua)ur 9 e y cihc*6);7c*uhe velocity at t = 5.5 s?

  In Fig. below, what is the average vefch xuto9 n w7jd:u0q9+m 0t2olocity from 0 to 4.0 s?

  In Fig. below, what is the average,4k r8b:zz2- fclkis z velocity from 0 to 6.0 s?

  In Fig. below, what is *tl)eif 56xss1 (fsuuthe acceleration at 1.0 s?

  In Fig. below, what is(,sjux 3cs me6 the acceleration at 3.0 s?

  In Fig. below, what is the average acceleration from l4j:9es2xa p xs+jo+y0 to 5.0 s?

  In Fig. below, what is the average acvl)64y0 aba efceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to -+e7l jd curzfjh956s)i ow v(8.0 s?

Does a car speedometer measure speed, velocity? {speedr et59.c h;f:uf kof2f|velocity}

  An object can have a varying speed if its velocity is constan f01li5-tls b+xpnr0tt.

  The velocity of an objec 5bz4,l1kxyan t can be negative when its acceleration is positive.

  If one object has a greater speed than a second object, the fcpt ;ai(b 2 rzc+x4t1 o)wun,uirst must have a greater accelera i2c awopru,c+t;(bz4t) n 1uxtion.

  Two cars emerge side by side from a tunnel. Car A is travelincdy .gizt. f+ndic/ 1a3vt/- qg 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 speed as its acceleration dpxhc2lkzei,aij- ob0 zt9o, 56jf +u2ecreases.

  A baseball player hits a foul ball straight up i6dj wz zmm,)/z8r4a7zqdrz g+t ko y++nto the air. It leaves the bat wkg) y8wz/+rdz m4d t 6rzo+qza7j +m,zith 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 e /,kldw bm,ra:1bkc4up, what is happening to its acceleration, how does it change if air friction ism1er la,/ b4,:bd wckk ignored?

  As a freely falling object speeds u-55/j 5ijp tx-fqijm mq( i6pzv)v)jqp, what is happening to its acceleration, how doe-q -f/ij)vzxqm ) 5piq5 5j6jj (tmipvs it change if air friction CAN NOT be ignored?

  An object that is thrown vertically upwa0s j9 7oviw,xj5e+bysrd will return to its original position with the same speed as it had initially if air resistance i,+v95sjo0ewy 7 xbjsis negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and n;vkrr(l v 1jq1onzero acceleration at the same time.

  An object can have nontm5a m5svl95z uhf;p3zero velocity and zero acceleration at the same time.

  An elevator moving from the second floor to the4. k mltmb-fdo3aai-f t )c1e aw2-od; fifth floor making no stops along the way has zero ;t .3m4ba1-oae2 d- lfc )dtikfm- oawacceleration all the time.

  A rolling ball moves frikv wof99 s(x8 h6is/wo5:zxaom $x_1=2.5 \mathrm{~cm}$ to $x_2=-7.5 \mathrm{~cm}$ during the time from $t_1=1.6 \mathrm{~s}$ 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 $t_1=-2.7 \mathrm{~s}$ is at $x_1=2.2 \mathrm{~cm}$ and at $t_2=4.1 \mathrm{~s}$ is at $x_2=8.1 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight compln ue1+ml2-l .q e8nkz,zix- rdete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.1 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trainecnw1qn1 gq rvntr36a,qgov.-7 y l9k2 r in a straight line, moving 109 m away in 12.8 s. It then turns abruptly and gqyq n7g -algvtwo1c6 2kr91nnv.,q3 rallops 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 from m.1mfj 8p (y; f.lqbpg$10 \; m/s$ to $24 \; m/s$ in 4.9 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 from 5 w:r7qco r*vwm*as;cmx7 7jy$19 \; m/s$ to rest in a distance of 62 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a 0xpu0nyhw 8 d;m;fm z7speed of $31 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.9 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially rzhb1+yw:d q7d c-e)dtop speed about:cb7ed rh -dd)ywqz+1 $11.0 \; m/s$ in the first 14.4 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 a speedxa0 t+yj bv ;r)+sj(m/c;/physty 4as of $18 \; m/s$ to rest in 5.19 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, yt,28 6rgpspdsh)lyb(bj i:d63rc2q a car leaves skid marks 92 m long on the highway. Assuming a deceleration o3jhdid(c t2 bryr,p ypl sb :2g6s)q86f $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck mr7bf 3t) 8c24umcibigoing $25 \; m/s$ 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).    $m$

  A runner hopes to complete the 10,000-m run in less than 30.0 min. After exactlrpkg j5)b 28tty 27.0 min, there are still 1100 m to go. The runner mur5b8pj)g2 ttkst then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$