Suppose that an object travels from one point in space to another. Mxb:y8d i0v;967rns knu x, mbtake a comparison between the displacemer,is8xb6 du ;tvn k m:yn9xb70nt and the distance traveled.

  When is the average velocity of an object equal+(v1;s/m f4g ei vqz-m3sb*etaz6 oul to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty ilgqc ll.49t08 ,krb vhn 8 s". This is a descr vk glt4h0b8 r.q,9llciption of

  An object moving in the +x axis etbgouryz)iwore4(fkb 38 -8(xperiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direcc798b3d00i .q mnvu3yml y/(uuxteqh tion) begins to slow down as it approaq ncu(3vmd7q8uy3xl. 9m uyh00e b/tiches a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow down 46 lj(w a xxxs5b31kkoas it approaches a traffic light. Make a statement conc6jx34 5xblk x(soka 1werning its acceleration.

  Suppose that an object is moving with a cxa/ z s+dr2;:ukmq ygvu2m4)q onstant velocity. Make a statement concerning its :4d /kg)u2r2s zq+qauvm;mx yacceleration.

  If the velocity of an 2(bfhlgu6fvh79d u m 5object is zero, does it mean that the acceleration is zero? f5 7v( 2udl 6fhgbumh9 Support your answer with an example.

  Can an object's velocity change direction when its acceleration is cons8r g:sr s8az 1uki;u4gtant? Support your answer with an ;g8rg1ui8rz4 aku :ss example.

  Suppose that an object is moving with constant acceleration. Make a/rylz2lr-u tp uue),6 statement concerning its mo)-uu l ,ry6l zu/r2epttion with respect to time.

  Can an object have incrdkf-eo32 ;ldq, m7asneasing speed while its acceleration is decreasing? Support your answer with ,d7k2;maqln o3desf- an example.

  Suppose a can, after an initia *-vh:afoxx0o l kick, moves up along a smooth hill of ice. Make a: 0ovxh*fax -o statement concerning its acceleration.

  Under what condition i8s /nhw011end lwxi2azlm: . ns average velocity equal to the average of the object's initial and fi h.lnnz:axwmn/1i s 10 dwe82lnal velocity?

  Objects A and B both start at rest. They both accelerate at the samelbx;z. ewkz : *18zbzv(z(+m fgiv+h v rate. However, object A acceleratesz evg:blkzvvhz zmiwb.(;x++z1f( 8* 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. They both accelerate at the same rate. sgaf8:zv. 2toac. )qpHowever, object A accelerates for twice the time as objept8 v.f:czgs.oaa) q 2ct 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 fricti0i di, rddw8)qon, which of the following i0iddw), iqr8 ds true concerning its motion?

  When an object is released from ressetx uzk (+3t9t and falls in the absence of friction, which of the following is true concernin(+kztsxtue 39 g its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocity a 5eb;pog0h+gknd the acceleration when the ball reaches thep+ bko5g; eh0g highest point.

  Suppose a ball is thrown straight up. Whatn+s2fb :p h8mv is its acceleration just before it r2 pmh+bvn s8f:eaches its highest point?

  Suppose a ball is thrown straight up, reaches a maximum height, thenavpi4jdd/-1 -s6gwy m falls to its initial height. Make a statement abi -jad/g ydvm4 1w-s6pout the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maxifjb2w0gwt7p 3stn)x80 c c*avmum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration 02)sb* cxc v3nttagpf8jw7w0 as the ball is coming down.

  Suppose a ball is throw8 ur.xlp l1h7jn downward in the absence of air resistance. Make a statement concerning its accelerati1l upx.lh rj78on.

  Suppose a skydiver jumps from a high-flying plane.rrhrb/b, p) *2l aqa/h What is her acceleration when she she reaches terminr,/ar )r*b/hha qp2b lal velocity?

  A ball is thrown vertically upward wp(pd,q2bcv 0f ith 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 ba,vc dbpf(p0q 2ll?)

  Ball A is dropped from the top 66f8t yljc;+xbt)captc+sa t( m :6pyof a building. One second later, ball B is dropped from the same build abaxm f t+t6c8t;)lp+jcc(ty:yps6 6ing. As time progresses, the distance between them

  Ball A is dropped from the top of a building. xov,o/ hwz 9g8 One second later, ball B is dropped from the same building. z x/gwovh89 ,o As time progresses, the difference in their speeds

  Two objects are thrown f9x - n6k vkdew2)dkpg8rom the top of a tall building. One is thrown up, and the other is thrown down, both with the same inid k)xn9k e pvkgw2-6d8tial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick l.k yugcu l 7mvzb1hpy; 0643tis thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations ouy l zh;0y kcm u17l3.bpvtg46f the two bricks.

  An object is moving wymn-b- jm1u 2hmk+su ;ith constant non-zero velocity in the +x axis. The position versus time graph-m;1 mh+un buk -mysj2 of this object is

  An object is moving with constant non-zerod9;pw ag 0p1so 6maf+s acceleration in the +x axis. The position versus time graph of this objectmd ;1gao6pw90s fap+ s is

  An object is moving with constant non-zero velocity in the +x axis:c: zjhp3 j3am h3wl p,/5lwgh. The velocity versus time graph ofhl3 w:p:ampj5l czh ,g33w /jh this object is

  An object is moving with constant non-zero accelera:rnf(;oi;itu tion in the +x axis. The velocity versus time graph of this objectu(;nri t:o; if is

  The slope of a position/g6os- -op2 mj,v2e 700eyeuz j drmyf versus time graph gives

  The slope of a velocity v1 le4fo v)0ond:mz6s mir/s0wk :dn; fersus time graph gives

  The area under a curve in an acceleration versus time g w99y;h m f :g-xuj3)hqi+hrxdraph gives

  The area under a curve in a velocity versus time lmb61+fs4 oay+hr sn; graph gives

  If the position versus time graph of an object isindww / z+4pth3+huno.u7 ue+hb(j,a a horizontal line, the object + uwua hn+4 ohhi,bz/etp7+(wud.3nj is

  If the position versus time gra +*q;as/- +qq+z -izw yeg hkoqq6dw2uph of an object is a vertical line, the object isw - wqes*d+giq6u hakzo q++;2/q qz-y

  If the velocity versus time grb,j t r(4 4wbsa,jarc8aph of an object is a horizontal line, the object r8 (j4a b4sw,tjr,bcais

  If the velocity versus time graph of an object is a straigho7,aouz0;gft r)kxvn rd1 u /0t line making an angle of 30 degrees with the timegf rx 1o) tra; vo0/ud,k70nzu axis, the object is

  An object moves 15.0 m north ak jewhwo2p*.aa: e7h 5nd then 11.0 m south. Find both the distance travelew: 2ha7 wa. ohek*jpe5d and the magnitude of the displacement vector.

  A boat can move at 30 km/h in stilk;whn80vrdy ro.( pr-l water. How long will it take to move 12 km upstr h0wp8dv r;(o yr.rn-keam in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609ea tw,fps)r5u. ev1z2 4hpzx4 m)

  What must be your average speed in4jmn9baugcxs64 7 l h* order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours ac)ps (xt9e6*sy1etm c nd 57 min. What is the average speed of the runner in)epx tems*6yts( 1 c9c m/s?

  A car travels 90 km/h. How long does ite7. q7hf;kzs 3o daqj. take for it to travel 400 km?

  A ly (light year) is the distance that light travels in onm1x.wp du59 hge year. The speed of gxu wdhm159.p light 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 ts5 en,bliden0m,:( kto the side for 4.0 s, how far do you travel during this inattentive perim0lbeni:(tnk, , de5s od?

  If you run a complete loop around an outdoor trackib4ydg)j *xnb pd9/g5 (400 m), in 100 s, your averagebj 4b 5*)ndidy9/ xgpg velocity is

  A polar bear starts atxww f r/0l8zdekn4c/n6n -dr * the North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to refdl/ 0 kw48nn *x/r6ne-rz cwdturn to its starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at t8jr75 is9pttthe North 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 startin8t7t9s5 tjp rig point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend fr; j wo s(xwxd:q*lb zsa84;v,jom 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. H;v dz84w*j :xx s,sb;(ojwqla ow far is your hometown from school?

  A motorist travels 160 km at 80 km/htnubb(w+nv zk1 ttw3):l x ;:;merq 4b and 160 km at 100 km/h. What is the average speed of the motbb;w: e :rtqun;tt ( 4ml3xkb)1nw+ zvorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and3 kf6c; t1zlgi 2.0 h at 100 km/h. What is her average speed for the tritg f13ck6;zilp?

  An airplane travels at 300 mi/h south fo 4ll;yww in,,m+ esjj6r 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for wl y4jm,+6w,;esil njthe trip?

  In a 400-m relay race the anchorman (the person who runs the7 y,u gkyjfc4t6pkp+hd,ek+ , 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 lose t kyd uc+f,kp746hpgkjet,,y +he race?

  A car decelerates uniformly and comes to a stop after 10 s. The carr ;:f ju ael,8atmj; cn6.k1ey's average velocity during deceleration was 75 km/h. What was the car's decelef6;c ymaeta: r. e8jk1lnj;,uration while slowing down?

  An airplane increases its speed from 100 m/s to 160pbxj/653;n ls izi/ ak m/s, at the average rate of /; / jl36 5bnxikzspai$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate ofuiwu rw9qowj/0(u5 u* $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and accelerateb84f rp u1 2w7hmnq4nts 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 u7 0y/ncb1rsqcjzcm 1*mp k9x5p with a constant acceleration rbs n9ck1c17p*/mmzyq5 xjc0 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 2.2 frmtel9mez8 l;ibtk w3-j+f- a k;39im/s experiences a constant acceleration olrfjb-e;;elk3i9 9fmm+ z- tik w38 atf $4.2 \; m/s^2$. What is the cart's displacement during the first 4.9 s of its motion?

  A bullet moving horizontally to the right (+x direcv yq:6z*s2n. tiynd j2ak .h6jtion) with a speed of 511 m/s strikes a sandbag and penetrates a distance of 14.96 cm. What is the average accelerahikz6y. n n*v. j:2t y2ds6qjation, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrier. It reah9gh6t n0h2x xches a speed of 42 m/s at the end of the catapult, and thisnx0hxhth g 962 requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant accelerar.5: zdcw/mx vjx:0ll tion 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. qhw:vph 9l299 x hor6t What is its average accelerat whx9rv o:q69 hthlp29ion?

  An object starts from rest iq6zs29iij0 qand undergoes uniform acceleration. During the first second it travels 9.3 m. How far will it travel during the third second s2qiqij 9zi06?

  An object is moving in a straight line with constaemt: ng ro4nvc vp7q9jk; 1: 0m81ssycnt acceleration. Initially it is traveling at 16 m/m0 rk:71s4 eqnmv vj ygnt;c8s cp19:os. 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 uniformly a,(-zdsehc(* eh 6i jlyt $3.0 \; m/s^2$. 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 oqm*)59actu ckog (i p.n 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 gr6vqzk0-; u u sz-r9ltkeen, a car that has been waiting at the intersection starts ahead with a constant acce -60zuz-kl;q t9 rvuskleration 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 upgs8hnq:f -zfjrfdl 6s4wye 1rx8q -/4 ward with a speed of 12 m/s on the surface of planet X where the acceleration due tq -ezfr srfd-w 4x46g1 n8hjqys: /fl8o 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 th59je hx h/ 4b +tx5ihpuut7o4pi3 jz.ze surface of planet X where the aco 4z 79z 5+ be5x/p4iu3pi j.tuhtjhxhceleration 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 u wkqc;c;jha8(t;-5v;yqc9gu sj sn* tpward with a speed of 15 m/s on the surface of planet X where the acceleration due to gravity9tg;ckq*t;5 js;us cqw cn-a( jyv8h; 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 surface of planet X whew .ym1ekzd9o:wo*t +pre the acceleration due .1wd :o+toew*zmpk 9yto gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is uce 9yuxq2x9 1gtp*qx(sually greater than 0.10 s. If your friend holds a ruler between your fingers and releasequ qt* gycx 99xx21ep(s 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 19.6 m/s. What is its ve :kxom 88onpndv38ft*gh9m w;locity after 3.00f mk98x8o v;d p*3wnng8tohm: s?

  A bullet shot straight up returns to its starting point in intoun7u zy 9 2e1gy xi:. k.jfjvo*:312 s. What is the initialzijio. t: 1k:go2f9 *yn3 .ux7nvujye speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it taoc6g j6z0cy1tcs. iq feloi,.u4;zy .ke to return to its .,i0 s4ufqo1 6 ji.6c;cyyzgtl. czeo starting point?

  A ball is thrown downward from the top of a building with an initial speetuli/7/k2e)gbw n.rz d of 24 m/s. It strikes thezb /ltr.g ue7)ni2wk/ ground after 2.2 s. How high is the building?

  A ball is thrown straight upi3h43u snpz4j 3hm:d3 5:ordegv6mco with a speed of 30 m/s. (only fill in numerical value in the blanks j u443 e 33m6os:i3rvdhzp:gcon5mhd )
(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 straighm-sny h1*lz6c4n:lyx t up into the air with a speed 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 1 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 12 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 12.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity gux8mcsvu xg 3hd72 80at t = 1.0 s?

  In Fig. below, what is thoixngk,tb /rp3-3q2l- wry4r e velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t =w qh 8zdu6k6w* 4.0 s?

  In Fig. below, what is the vel1 zp:6q. )ngwk5 tufdtva; 3hkocity at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.02xh t*ox--y lk s?

  In Fig. below, what is the average velocity frohq:-r/h39sg lpb di(+unz:+r xzt ub(m 0 to 6.0 s?

  In Fig. below, what is the acceleration at synq f(:uuk0zg-;m*9mtz+u6is*at a1.0 s?

  In Fig. below, what is the accelerat87u g-wzu syd,s5ow5btr) st) ion at 3.0 s?

  In Fig. below, what is the average acceleration from 0 tl.vu g)j 6jnbqpb( hwv35d,*lo 5.0 s?

  In Fig. below, what is the average acceleration from 0 toku /--tm/p:e - woedep 8.0 s?

  In Fig. below, what is the displacement from 0 t3.u pi eb5k.-lu zi6)rmkx7hio 8.0 s?

Does a car speedometer vn6 g-;i ooik.57aaxbmeasure speed, velocity? {speed|velocity}

  An object can have a varying) lq(os2 epl hur4u /xk+,8m;f0gfwmy speed if its velocity is constant.

  The velocity of an object can be negative when its qin*r z;/ax,hk:ly. gacceleration is positive.

  If one object has a greater speed than a second objec.4alte-deaddc5p9, dv*aii 3 t, the first must have a greater acce3dd,*5cv 4 .dee9tp aaliadi-leration.

  Two cars emerge side by side from a tsag3 lkyp :r5.unnel. 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 speed as its acceledl/4yfh l8zh .,a,j:: o qwfmyration decreases.

  A baseball player hits a foul bal 4x8+ecy10xkis mthx;l straight up into the air. It leaves the bat with a speed;0xi +ycetmkxsh84 1x 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 spee-wa : 6hbati cqc.ke)iawf,7 /ds up, what is happening to its acceleration, how does it change hiiwt7.,aw qc -a b)kc/e6 af:if air friction is ignored?

  As a freely falling object speeds up, what is happening to its acc7/rxn)d2 x5ygjo o2sk 1za d-beleration, how does it change if air friction CAN NOT be) b x2s-a12grd/j 7x5dzooy nk ignored?

  An object that is thrown vertically upward wilwnz96m / 9w lu3j7uanil return to its original position with the same speed as iw9na 79iu3mnujl zw 6/t 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 nonzero acceleration at the sur1x s gys(u y z482+6cb8ecmhame time.

  An object can have nonzero velocity and zero acceleration at tnc gd.u)s 3*arhe same time.

  An elevator moving from the second floor to the 5r,-ts jzfnp(z9cq(klg5 1he .f(bj ififth floor making no stops along the way has zero acceleratiz 5 zcin,(qke-51. lh(g9pj(fb s jrtfon all the time.

  A rolling ball moves f h,w/y ea)v ry3-3wunprom $x_1=2.9 \mathrm{~cm}$ to $x_2=-7.1 \mathrm{~cm}$ during the time from $t_1=1.8 \mathrm{~s}$ to $t_2=5.4 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.9 \mathrm{~s}$ is at $x_1=3.3 \mathrm{~cm}$ and at $t_2=3.9 \mathrm{~s}$ is at $x_2=7.6 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps ard.wakqa5ilx(vqa99p (24o xav9azi:ound a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 10.9 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 w+n;quk6jpir/5x1dh 100 m away in 13.7 s. It then turns abruptly and gallops halfway back in 4.5 s. Calculate (a) its average speedx1 d5u +pwj;r6inh/qk  (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 fromo- zr cu tgk*j5ol2(h/zsy9e c25lor. $11 \; m/s$ 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 from prwyxu*62/ b3to .4p7 atak fe$17 \; m/s$ to rest in a distance of 83 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a omkk6inh tc -s 4v(4pa-5qh(r speed of $26 \; m/s$ 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 can burst out of the blocks tih gjowu9.v5w6y g7s9oiv5z (o essentially top speed aboutw7iv vh6.w jsy5gizgo5u(9 9o $10.1 \; m/s$ in the first 11.3 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 xnzx 7 8-3 xhola7jk7a1on9q wa speed of $17 \; m/s$ to rest in 4.49 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 th9ud) oa (8:rymm muq*le highway. Assuming a deceleration o:oammul()r8 mu9y d*qf $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truc9bv:bg n .fqk+kvbu ;6k 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).    $m$

  A runner hopes to complete the 10,000-m run in less than 30.0 min. A v3coh6xecz+9jn:,eb fter exactly 27.0 min, the:cv3 cjhx bz6+een,9 ore are still 1100 m to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$