Suppose that an object travels from one poi+2a1d l:luwaent in space to another. Make a comparison between the displacement and the distance tledlaauw 12 :+raveled.

  When is the average velocity of an object io;loa+a3 1 ckequal to the instantaneous velocity?

  A new car manufacturer advertises th-ggmy *0 a+ d ugsvp40f-z0plbat their car can go "from zero to sixty in 8 s". s-gpa0p*0bg4y v d+mfugzl-0 This is a description of

  An object moving in the +x axis experiences anq 3a)jueemcw 7 /biid -l3a,y* acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direog3,1 klz b9rlction) begins to slow down as it approaches a trafrlo13,lzb9k gfic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to qi1n2ig7hew8 the West (-x direction) begins to slow down as it approaches a traffic light. Make a stat8 7wqigi 1ne2hement concerning its acceleration.

  Suppose that an object is moving with a constant velociuq)irapa+04fc kxi/v /,p9 mhty. Make a statement concerning its ac, a/f0x aik uppr4 hm/)qvc+9iceleration.

  If the velocity of an object is zero, does it mean that the ;l1j3blnio)ic)k uk9 acceleration is zero? Support your answer with an examplcllbn1 kj)k ;9i)oi3 ue.

  Can an object's velocity change direction when its acceleration is constant? t) /ll.5;us:myfs xq 6pdq 7-qqso mq6 Support: y suq/)oqdmq 6m7xtf5s6l ;.-qqslp your answer with an example.

  Suppose that an object ifvnn) y* hmrvr:j329ef0o g.m)/io y us moving with constant acceleration. Make a statement concerning its motion with respe .)iuyynr3or /m) jg*0envf2 fv:ho9m ct to time.

  Can an object have increasing speed while its acceleration is decreasing? Supseb4wjft s5 6cu,q q3e71/ niuport your answer ws5jnb 7u/ i 1wfq63cu4s,qeetith an example.

  Suppose a can, after an initial kick, movur(*xl3hv7nxcn vr)+ es up along a smooth hill of ice. Make a statemenhn3*(uxvcv+x rr7 n )lt concerning its acceleration.

  Under what condition is average velocity equalpc 4 7e(su9yrj to the average of the object's initial and final velocit sjp4y7(9rceu y?

  Objects A and B both start at rest. They both accelefx 2;78 /ex bcg7skk+hkpr4vg rate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that ofg;7+h4rexxsvg k p8c f2k7/ bk object B?

  Objects A and B both start from rest. They both acc /v+o:,xapgj.kavn 01.pwlsjk:e uh4elerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A comparedj, ovxp+ gvp :hj.4au .ka:s/wn10kle to that of object B?

  When an object is released from rest and falls in the absence of frio,geq +m0g.hf ction, which of the following isf ,mghq0e+. go true concerning its motion?

  When an object is released from rest and falls in the absence of friction, whio v yam 4(b; 7wgyttoba9b4 g9w/w0ea+ch of the following is t 0(tw7mb4bovw ey +oag y w9a/9a;bg4true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement abo-4l8( idco7flx;d bkzut the velocity and the acceleration when the ball reaches the highest pk (cbz idl;8loxf74-doint.

  Suppose a ball is thrown straight up. What is its acceleration just before it r3l/ dxr 7i3tlreaches its hig3xl r/i l7tdr3hest point?

  Suppose a ball is thrown straight up, reaches a maximum height, moe1(5u b k*g5rsnai7then falls to its initial height. Make a statement about the a k srg*(mi5bn5o1u7edirection of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum heigh 2e9 c3j9lppzbt, then falls to its initial height. Make a statement abocp3zl2 e j9b9put the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of *xkhbivi; c,(nxi c u 3(h in/9ufz)d-air resistance. Make a state-cud*39 / ,ux ic(h;nbzk iiih)xf(vnment concerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her acceleration whb(dcaawqr /;ky*o0 e6 en she she reaches terminal vkc d0oea6w;by(q*ra/ elocity?

  A ball is thrown vertically upward with a speed v. An identical second 3l:p;kh2xfs aball is thrown upward with a speed 2v (twice as fast). Whaaxfp2:; hs3lkt 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 thjl )92 .ch7k tffgw9 ajiz4qx2e top of a building. One second later, ball B is dropped from the same building. As time progresses, the distance between thefjgh2lakq9t)c.j ix4 9w2z f7 m

  Ball A is dropped from the top of a buildingt ul;o,rli9 . xjvsi;+. One second later, ball B is dropped from the same building. As time progresses, the difference in trosl.;l xti;9v uij, +heir speeds

  Two objects are thrown from the top i ;vwl4w*0fvn of a tall building. One is thrown up, and the other is thrown down, both with the sa0v*w4vlin f;wme initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a 8mx ;fxws6r5 k:gx6bybuilding. A second brick is thrown straight down from the 8rs:5m6xxkbxf6y w;gsame 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. Th nq 4y;*mqg1khh c4:tye position versus time graph m;1 4qqyh:t khy*c4gnof this object is

  An object is moving with constant non-zero acceleratib4w)szw 1qd9j* n)icyon in the +x axis. The position versus time graph of this object )jizwbwq *1 sdncy94)is

  An object is moving with constant non-zero velocity in the 9qc0,zbwl8w ;*3 llbas9ll it +x axis. The velocity versus time graph of this ob0lcbazq wlw9 8til,3*l; b9slject is

  An object is moving with constant non-zero acc-pi- kfwai9i; eleration in the +x axis. The velocity versus time graph of this ofp k-a;ii9i-wbject is

  The slope of a position versus timebxzjd6+bs. 9 r graph gives

  The slope of a velocity ve1h3wha) piq b2rsus time graph gives

  The area under a curve in an ar6y, vm0z:kj ; upjpn2cceleration versus time graph gives

  The area under a curve in a velocity versus 9igl m.+rj7 sftime graph gives

  If the position versus time graph of an object is a horizofad8 jd3cto-6o (q v+wntal line, the object i-ocw q v+df8ad6to( j3s

  If the position versus time graph of an object is a vertical line, the ob fspmxch:in6 :4 *3xngm7d8d zject iszxi nh:d6 xpcm*dg48 7fs: mn3

  If the velocity versus time graph of an objb009 kb. ci ;e1l 3;lalm hf+rv+9ssrim+k gxhect is a horizontal line, the object ibesl;b +f0gki lx+9kr9lhm0vr mi13.;a+hscs

  If the velocity versus time graph of an object is a straight line makin4x qo392aahl xuvjpzhn ()0q3 g an angle of 30 degrees with tq3(v 3zlaa o)xpxjuhq90 4n2hhe time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distaplxgh9,4*vu: wgt(6nz sd z- once traveled and the magnitude of the n(up6og vhg4z9-sx t :wdz,*ldisplacement vector.

  A boat can move at 30 km/h x1d)ew 46u a 7zfy+,lic/ts tiin still water. How long will it take to move 12 km upstream in a river flowing 6.0 i ce)1 6xtidftwu,a+lysz/74 km/h?

  55 mi/h is how many m/s? (1 mi 5k f+mf 8d4/jfjqg+fj rofy*7= 1609 m)

  What must be your average speed in order to travel 354 q9ba*uq3(phpw t6fa0 km in 5.15 h?

  A runner ran the marathon (rr, 1soj7a a8japproximately 42.0 km) in 2 hours and 57 min. What is the average speed of the runner ar1s j7ajr8o, in m/s?

  A car travels 90 km/h. How long does it take for it to travel 4c(,ku d kzdwx56j2lk 700 km?

  A ly (light year) is the distance that light traveil jz*sc; j3ws:js 1 :6h4al qhsy9bu4ls in one year. The speed of ligh4l4il q*cj:ws :jyb1hu3j6a 9s s z;sht 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 wt4k0f p+gq7jm(5 gl)pd n+ pathe side for 4.0 s, how farafg4k(dq+ 7 tm 0p +npjgl5w)p do you travel during this inattentive period?

  If you run a complete loop aroir08hn6 n8mujq u;niy,q*r,y und an outdoor track (400 m), in 100 s, your average n8;ui8,nm0q j6 ,* rhunyqiy rvelocity is

  A polar bear starts at the North Pole. It travels 1.0 km south, tq aop pjpnr47.:sj2dx kv:49uhen 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting poi ja:jvq9p4xrnuds .7pk 4o2p :nt. 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 sout, vh*o ebfqt,8h, 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 bear's averagte*fvq8bh ,o,e velocity?

  You are driving home on a weekend from school at 554nrvrc6 t k66ey-8mba5 d1zae 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. Hom561eavtr6 -eb zad6 ckr8ny4w far is your hometown from school?

  A motorist travels 160 km9*gr 1krvyv8q9r-ywpq8hqm 9 at 80 km/h and 160 km at 100 km/h. What is the average speed of the motorrrv8*k99g9p8qyhv mw y1r q -qist 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 aver6 8n-8f4uz1z: frf wy0 elcpzyage speed for the tuf ype1 0-zrzn 8lwy8c4:f6zfrip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h nz+*fz7pwob m 0wv xd.7;c2tjaorth for 750 miles. What is the average speed for th+jcvf* tz az0b7w;d.wpx 72ome trip?

  In a 400-m relay race the anchorman (theu d-vyf 3w5+ vj9ttsxm+h7l ;33uopzb person who runs the last 100 m) for team A can run 100 m in 9.8 s.sty33dl vz3pv+uoj+w -m9;b 7ux t5f h 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 the race?

  A car decelerates uniformly and9dwhi dhldf - e9*g+1r comes to a stop after 12 s. The car's average velocity during deceleration was 53 km/h. What was the cw9*di r ldgdh fh1+-9ear's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average rateaa owegov8o/4k-8e7 8r lpg/v of ow e g7ogp a88v/ rl-ko84e/av$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accri4k*c 7acmoss;y- u9es(:w celerates 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 accelergbs.b(,dk +g+ot ; vn )cl5wui;h0kmgates 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 form-cto1 /hwrs9v+f tu) 10 s. It then speeds up with a constant acceleration9huf)vr twt/co - +ms1 of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial v c.+j:g6 . rqpez4pbcdelocity of 7.3 m/s experiences a constant acceleration ocg6ce.. bz4 r+j pqp:df $3.0 \; m/s^2$. What is the cart's displacement during the first 7.8 s of its motion?

  A bullet moving horizontally to the right (6fsjwx*1)pw u+x direction) with a speed of 466 m/s strikes ) ps*wu1jxw f6a sandbag and penetrates a distance of 62.32 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launchek :zqg52 b do9h7oaug.d 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 conq b zu: hag5gko27od9.stant, what is the length of the catapult?

  A car starting from rest moves with constr:wxe/8w4gods tc13n1l i1 sdant 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 (v 6(jhflr)mpu9l/y w distance of 200 m. What is its average acvrj6wyf/m( h ul9p) (lceleration?

  An object starts from rest and undergoes u gma 2,clp+spg 3el3e4 y:hpz1niform acceleration. During the first sel s+ph4e3gzya pc3,1me 2p :lgcond it travels 8.8 m. How far will it travel during the third second?

  An object is moving in a straight linekr no;*d7wx0ff. v vuf+9go ;i with constant acceleration. Initially it is traveling at 16 m/s. Three sevf*r7uk g+0f9 nx;.fo vdw;i oconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates unifoaj (*d cqe )5/v/svnfprmly 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 about m hm*eugc.wj3n49 g/y:tm wp5$5.0 \; m/s^2$ 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, g:j7ev p:5mpea car that has been waiting at the intersection starts ahm5:j egpp:7ve ead 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 qpg9)2c: lpwhb y+lp1 speed of 12 m/s on the surface of planet X wherebllqg19y) pw c h+:2pp the acceleration due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown uxm,o/ yv k/s8ppward with a speed of 12 m/s on the surface of planet X where the y s,pk 8ovm//xacceleration 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 surface of plan2m*-yicd8m(b 0 sm-t :ynnw ivet X where the acceleration due 0it2-nm:8md *wcn-y ybi( smvto 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 up.jxb fk2:-kzfqp(u5w/qo9j.m, ku qd ward with a speed of 14 m/s on the surface of planet X where the acceleration due to graw59:2km( kub-j/q kqfodjuq.fx. ,pz vity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than 0.11u kvkf-lw3(s0nn5vxza ir- /0 s. If your friend holds a ruler betwankxkf3iul /5v vw-sz- ( 10nreen your fingers and releases it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocitjq-)u ti bt/-i7md1wfy of 19.6 m/s. What is its velocity after 3.00 sim-7q1d/bfwj )- tt iu?

  A bullet shot straight up returns fm5jum (xazvl4; /nv1 to its starting point in 5 s. What is the initial spe4fvu lm;x1n(j v maz5/ed of the bullet?

  A ball is thrown straight up with a speeda xp(;(/ti7 hqqgc;g8 mn0oougxoz ;+ of 36.0 m/s. How long does it take to0;qg mo u;ca +nozgxq hoxtg/7p;((i 8 return to its starting point?

  A ball is thrown downward from the topniudt pt7qwuy;2,2*g of a building with an initial speed of 8 m/s. It strikes q7n2iw2u*u tpg, yd;t the ground after 1.6 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only/*0dfa2r wfh t4xw. icpilwc)nwb31 0 fill in numerical value in th/ 4 irdtw3wwc h2)1.0f0clai*bp xfnwe 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 i5xiknlrk:3 ) -o/cjvp nto the air with a speed of 28.4 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 10 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 10.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocitygxs +zuy1594jwplj: g at t = 1.0 s?

  In Fig. below, what is the velocity zr :vm84r, corvwnf(bqp 9 l9/at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.0t.4 al0939 9lpsgagkn ph-lbd s?

  In Fig. below, what is the velor *td: hllh:(ccity at t = 5.5 s?

  In Fig. below, what is the aveh phhb9hbhq(g26o- -hrage velocity from 0 to 4.0 s?

  In Fig. below, what is the average vebiw u2p6k0.sz locity from 0 to 6.0 s?

  In Fig. below, what is the acceleratio jc55qa9(( dvbwabog;n at 1.0 s?

  In Fig. below, what is the acceleration at4a* dy bqx1vv:lh lmzm/tt/o,,t b,n(xs 55p a 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0o oprr 1q: my+y1tcpznz. .gs 81caa+. s?

  In Fig. below, what is the average acceleration from 02 uzgjc7f5r2 w to 8.0 s?

  In Fig. below, what is the displacement fm8 dhi o hi4n4f9i6bzftc672 prom 0 to 8.0 s?

Does a car speedometer measure speed, velocivi e;x6gy lzc69dml:4 e:sq(bty? {speed|velocity}

  An object can have a varyingm e2az 1wv-x8u speed if its velocity is constant.

  The velocity of an object can be negative whenydrs7c+5q v7z0i6 jrm its acceleration is positive.

  If one object has a greater speed than a second object, the first must ojdu2fx mt pf55s395k3t-vbkhave a greate fm jbfpxuto9 25d3kv35-5stk r acceleration.

  Two cars emerge side by side from a t;yef r mh1pnx:27 g:yeunnel. 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 spee;-)g h3 plwmkid as its acceleration decreases.

  A baseball player hits a foul ball straight up into the axr 23wo 5 fzjvyay8af/x/72kzir. It leaves the bat with a speed yyka 72a5r2wfz/ fjz8/v3 oxxof $120 \; km/h$. 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 its acceler +p) zpwbzjy*((7r+vh p kyv l1ooq78b5zlt3 fation, how does it change if air fri+zr7q1(v 7k 83bz bftw pohyp)ylz*(j 5+pl ovction is ignored?

  As a freely falling ob a- 3-vj gxk5yjt:wf-aject speeds up, what is happening to its acceleration, how does it change if air friction -a3j yf :kv5tgx-awj-CAN NOT be ignored?

  An object that is thrown vertically upward el8o* c *3hog5is-f6vy cjv-bwill 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 result be alteb cscoyvgih3* f8* 6elj -o5-vred?

  An object can have zero velocity and u() fhdg x+uvj5o*j6pnonzero acceleration at the same time.

  An object can have nonzero velocity and zero w( ajw1g i/(eracceleration at the same time.

  An elevator moving from the second floor to the fifth floor making noh8yeeo / 5 ic3pw(a(mi stops along the way has zero acceleration al(mpe8(w3iay / ice5 ohl the time.

  A rolling ball moves fz9h n+ivo0jy7t 8b/ddrom $x_1=3.1 \mathrm{~cm}$ to $x_2=-5.6 \mathrm{~cm}$ during the time from $t_1=0.8 \mathrm{~s}$ 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 $t_1=-4.4 \mathrm{~s}$ is at $x_1=2.2 \mathrm{~cm}$ and at $t_2=3.9 \mathrm{~s}$ is at $x_2=7.9 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around l8xq+(:jdqg ru p3x1q yhz rd829l*dva quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.8 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, mfv4xbwrwo 0rwgf9-v6g aq2k1, w +qr8oving 104 m away in 13.8 s. It then turns abrupt8gv6rwkf ,rox2v1b 9q- w+ a gq04frwwly and gallops halfway back in 4.6 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 frod2chv.6a7pn8.g2n ni / lz.f dxqsxz4m $11 \; m/s$ to $23 \; m/s$ in 4.8 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(rtf 9oz;xbm8 $18 \; m/s$ to rest in a distance of 67 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed o fp-g xzxylbp)e6ux21b5 i8+pf $27 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $3.0 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the :ek4idv; /t5fpqy/egx.sj;z blocks to essentially top speed about;fjs;ig 5t/qk4xpy. v/e: e dz $10.4 \; m/s$ in the first 11.0 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 fr:hgjvgh14x d 7om a speed of $15 \; m/s$ to rest in 5.37 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 the highway. A78f/ ox fegmzax ,/72 qzvoyi6ssuming af82o7xvq6 z/xezfagm /7yi ,o deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trr; yd5r:a urek sf2bnt.g3 q;:uck 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. After exacidkiql;:(/ec (q0cyvymt::s 1ju-t r tly 27.0 min, there are sti/ m :s;(q1ul-c(0ii qytdy:rj :k tvecll 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?    $s$