Suppose that an objes+rqr m6+(h 0akb7ozl ct travels from one point in space to another. Make a comparison between the di ao+bs0h m67k+qzr(lrsplacement and the distance traveled.

  When is the average velocity of an object equal to the instantaneous vywg c k9.+r-w:6fwbaielocity?

  A new car manufacturer advertises that their car can go "from zero to sl pu+egc-s+7 va4g.dn(4hqqi.6f hblixty in 8 s". This isqu-h b+.l4hn eqv(. apgsd+g cfil647 a description of

  An object moving in the +x axis exm.kzn3f i*rtb2cl n 6+periences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) beg6a u .jo;2v co7faafd3ins to slow down as it approaches a traffic ligha.vf;of 2aa7cj duo36 t. Make a statement concerning its acceleration.

  Suppose that a car traveling to the Wer-09fwjfsh1 d *eam ut9 .i(vyst (-x direction) begins to slow down as it approaches a traffif- h mj(rew0atid19sf9v.*uy c light. Make a statement concerning its acceleration.

  Suppose that an object is movinrcp4 0 gshc841* awmong with a constant velocity. Make a statement concerning its accelear0*p148h m no4gwcscration.

  If the velocity of an object is zero, does it mean that kd c:t dd/p)v9 90 mv1naoxs7jthe acceleration is zero? Support your answer with an exampleo)7 dk01 mdvaxjv9 cstn/p:9 d.

  Can an object's velocity chboo rum a c0;mmz1suk16v0u47 ange direction when its acceleration is constant? Support your answer with an examu v741m z6oar;bucm01su k0o mple.

  Suppose that an object is moving with constant acceleration. Make a statement+* rkc.r*k7:rlji 8 0q vgysxl concerning its motion wjsk .g:yrqr ik *r*xl7+l8v0cith respect to time.

  Can an object have increasingye:8 ydu) y-ppesj: 9l speed while its acceleration is decreasing? Support e :jy-8:plude9) ypys your answer with an example.

  Suppose a can, after an initial kic qtm8tjp(9sa .k, moves up along a smooth hill of ice. Make a statement concerning its accelerat jt9mp 8.(stqaion.

  Under what condition is average velocit0 *espq-h8s ,oh9ldap)zv s1zy equal to the average of the object's initial and finalzh1 9ea*0d)h z ps8s,vq ol-ps velocity?

  Objects A and B both start at rest. T2kn),mc6yu : kly-zyyhey both accelerate at the same rate. However, object A accelerates for twice the time as objecyulckz2)y ,n:- y ky6mt B. What is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. They bo)poo;tmi4c il*7g gr r*sf1z/th accelerate at the same rate. However, object A accelerates for twice the time as object B. */zmr i; l)ogstro*icf 4p7g1What is the distance traveled by object A compared to that of object B?

  When an object is relde93n8 w9m(n dvc( rm rgow4p,eased from rest and falls in the absence of friction, which of the following is true concerning its mowgdorme,wr9c 8 (n4mpdn3v9(tion?

  When an object is released f qndmru .(3gyt8 qnd-)rom rest and falls in the absence of friction, which of the fqg mdt.nq)8u- (rynd 3ollowing is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement +r4 1thmpgyw s0q-1j9ame 9cgabout the velocity and the acceleration when the ba0g -e pjawmh94+c1qygsr9m 1t ll reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just bij/ky/) 59.lbqz1 sr 4smx zkcefore it rz4 l.r y/s5mijxz k/c9)1kbqseaches its highest point?

  Suppose a ball is thrown straight up, rea bj/8loi;pfr d q(qg*2ches a maximum height, then falls to its initial height. Make a statement about the direction of the velocitd*bpj8r;g l(i q2fqo/y and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height,fcemk)5a8 jo : then falls to its initial height. Mac oajk):e f58mke a statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. M +sd rebbe028i p(snm8ake a statement concerning its acceleration. s2sbeibdepm r+88(0n

  Suppose a skydiver jumps from a high-flying plane. What is her acceleration whed -,mk(sph5 pfn 5d(pk, spmfh- she she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical second ball0wmwt.0tf pn c;w*0szf0fij v dg;f42 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 pww fdi*s40tvmnc tg0fz0 0ff;2 .;jw ball?)

  Ball A is dropped from the top of a building. One second(:+xrsf oc ew0 later, ball B is dropped from the same building. As time progresses, the distance between +e ow( frscx:0them

  Ball A is dropped from the top of a building. One second later, ball 9tu 1+9ljo,gi 6wbzqtB is dropped from the same building. As time progresses, the difference in theiu6q ,l+9o9 i jttbwgz1r speeds

  Two objects are thrown from vkt , g0)p4aw x04+ock; jjt;qfpl 2srthe top of a tall building. One is thrown up, and the other is thrown down, both with the same initial 4ckv;t +w2of qs,)jt; 4pl pjx00 arkgspeed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is t3mf*,fios/er*ax5fo5 hp i8ihrown straight down from the same building. They are released at the same time. Negle h/ e8*5fp oixfso*iif53,mar ct air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. mdyponfec )nw/ -b.7n g4m1b2te eg*,The position versus time graph of this ootm7eg.mcdneg 2 f4, n eyp1b/-)*wbnbject is

  An object is moving with constant non-zero ax3r3ja 0y/wzg( )yql jcceleration in the +x axis. The position versus time graph of this object z 0 l()rgxa jj/w3qyy3is

  An object is moving with constant non-zero velkop4m619jlz e3ljhf((fif k ;ocity in the +x axis. The velocity versus time graph of6iz;l14 jhfm(9feof pk 3( lkj this object is

  An object is moving with constant non-zero acceleration in the +x axi.uz1ywj uy1 nd; oo(cwp0u y/:s. The velociu .yu;ow:p0zyy1njud1w c /(o ty versus time graph of this object is

  The slope of a position versqge q;3 (l7k+pums v-z6s3 myfus time graph gives

  The slope of a velocity versus time graph wu1(4 4e*ll:qk d hnzzgives

  The area under a curve in an xzlc/mf;8 v gq39l2 cpk .xg :.cbuof5acceleration versus time graph gives

  The area under a curve in a velocity versus time gra-k3 daa,olol*qtybc- 1s,:d bph gives

  If the position versus time graph of ax x.tfo)5r/ fan object is a horizontal line, the object isx5)fr/f t ox.a

  If the position versus time grsji ),uk/ 2deoaph of an object is a vertical line, the object is2, /su )jdeiko

  If the velocity versus time graph of, * mmd7guw,lq an object is a horizontal line, the object isqmgml,7u* ,wd

  If the velocity versus time graph of an object is a str6mgc-h y3fric(x(r8z aight line making an angle of 30 dec(gfim3 hcrryx8 -(z 6grees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the did)o/rn sbgc+, stance traveled and the magnitudebosdc/g n+ )r, of the displacement vector.

  A boat can move at 30 km/h in still water. How long w6 0 k(incqmwh-ill it take to move 12 km ups-wkic (6q0m nhtream in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1o:ix xi g-2;(ytgp. px609 m)

  What must be your average speed in order to travel 350 km in 5.1 rvs1l.- y/uq,mo trs85 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 qinn/6d7dos/z:9 nxcmin. What is the 6n7:9inc/onqdsd x/z average speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for (yrvr2 (n8f 5vz-8w*0fslybs u7 dto iit to travel 400 km?

  A ly (light year) is the distaw)zjwbu:g+ 66xmd l,xnce that light travels in one year. The speed of lw66, :wjzuxb+xl) mdgight 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 34wct;uoz4i70zcad7c y.ki y road and you look to the side for 4.0 s, how far do you travel during this inattenti.o; ikc4 utw04dzayyz7icc 7 3ve period?

  If you run a complete loop around an*at3 8my f.-1utdh 3ptom-w xm outdoor track (400 m), in 100 s, your average velo*3 fo1 dwx attu-.m8m3yth-mpcity is

  A polar bear starts ksx3z g(xgv +z9 lu* rq/;xk,ep+c*wxat the North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, 9x(+* kku 3wls *qg cxp x;,/evzzxrg+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 tq nel70.+ :qbq-x;gucsvtfs1 he 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 starting point. This trip takes 45 min. Wha- e tx+lnb7qqfq:v. gcss01;ut was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles. It th:efi7t7 rc ;aoen starts to snow and you slow to 35 mi/h. You arrive home after drivif:i7t;r o7cae ng 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100)c8 *)3( meq r( dv;qslyxqsre km/h. What is the average speed of qm;cs)d(vxey (ql *qer8 r s3)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 istn vm86f cmiex*9 +t2l her average speed for thmfm+v982i6x *ettnc l e trip?

  An airplane travels at 300 mi/h south for 2.00 h and then g.:t 9q kl7h hyj(b.tmat 250 mi/h north for 7.tq9 lh: g7(hkb.ym jt50 miles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m) for e o 5hpclb79(bp.zl wu9 yoq57team 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 wh( zy oe9p7o 9 wl.hbq7cbplu55en 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 c/eaj0iso 2g ; cdho7rbfata9y cq p*-6.4f(yyomes to a stop after 10 s. The car's average velocity during deceleration was 75 km(2. 4pcfyqrhfycojs7- bt6oa ai *y;0a/de g9/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at thelpke .h yzh4;* average rate of *.yez ;k4h hlp$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the i98azfkzf2i j+jo9 y 1 li3y a/r/uum;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 accel7wtf n6) f*p m:d2a-jj. tz- oxtp+qederates 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 6 .;t q*clx5 olm)xbnxwith a constant acceleration ox.tlcx*ol mq )6;x5 nbf $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 4.8 m/s experiencyfzt/qn , .quh6.:iykes a constant acceleration oh.y.z6kqqt,: y/nfui f $3.7 \; m/s^2$. What is the cart's displacement during the first 6.8 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed0ta93* bhcwmbd .b81/eshh ci of 309 m/s strikes a sandbag and penetrates a distance of 24.13 cm. What is the average accel e 8dmcb*hh/hw1bta.s93i cb0eration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrier. vb0iu*,;nih jeqc+m)lqu;i 7 It reaches a speed of 42i0jic m;bilnhuqq e;u )7+v*, 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 catapult?

  A car starting from rest moves way( 8ow y4wph,ith constant 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 a8wfvbr;do 6he 9x5 7dt distance of 200 m. What is its average accel5 ;vtw8e6 hd9rdof7bxeration?

  An object starts from rest and undergoes uniform acceleration. During the ss:snb hu;p 6 efya 5c7j9e9i)abzd+)first secon)6 e; u: b 5iy9csa+9h7je fsndaps)zbd it travels 3.7 m. How far will it travel during the third second?

  An object is moving in a stnfeym);e3ai22q o:uhraight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is tr)2;n me3yi:u2oah efq aveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniformly atu7tf37lup/ ( ij)qc mzvcf*n8 $3.0 \; m/s^2$. 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 rqbba5dho )a1q1.z:jr oad 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 tnt)42cbz9 2 metgk i7bw-qq h.he intersection starts ahead with a consgzq-b4eit.m7qb tn22w9ck) h tant 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 X whf5oh nd i (n57rze4tk6(x:zdo7c zb8x ere the acctik(zdno857 5r z (zen46f xh 7:obcdxeleration due 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/fv.9kj92 ;krxrz v :wugw+8h4ios/ogs on the surface of planet X where the acchu v 92.x8j9kkigz4rw :;vwogr +fo/ seleration 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 esnr rpal+97bo 8y2y*uk:s , owith a speed of 15 m/s on the surface of planet X where the accel yp ,u lnr+as7r9bso2*ky8eo: eration due 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 oc 4.io9i cygu lra;0f+n the surface of planet X where the accela 0 ci;y.lruf+ ioc94geration 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;v(y+j0a(tf24si l bigsn- pa 0.10 s. If your friend holds a ruler between ys y(tv+4 ;bl0gf2(ia a njpsi-our 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 tj ;f*. pifuyxoon6dt; p-3ciw6p. t2velocity of 19.6 m/s. What is its velocity after 3i2;txtp.y .jw6 ff3uo 6d nic*t-opp; .00 s?

  A bullet shot straight upmx/hj+4f .ob f returns to its starting point in 11 s. What is the initial speed of the buf+4 fxmh/.jbo llet?

  A ball is thrown straight up with a speed of 36.0 m/s. pct:5m 2u czz2 How long does it take to return to it:m z5c2ptcz2u s starting point?

  A ball is thrown downward from the top of a building with an initial speed of;r-:diwhy y:kf,z j 3gi) v vex64rmf4 16 m/s. It strikes t 4kx)vjfzm :ryie43,6 f;vdh-yg r:w ihe ground after 3.9 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fix2(yyz ydj b3 h,9.i1o weq+uxll in numerical valq(x ob y19z 2 ejyuywdh,x3+i.ue in the 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 into the air with a speed oc8 w hm-k 9mrvy s;/c:tsfk9u6f 33.4 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 3 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 11 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 11.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocmd6gcn vw:)wql1.ma n6z4.g qgl1)q sity at t = 1.0 s?

  In Fig. below, what is.th ;evd20uiy the velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4ozf.;v; l 8dyc.0 s?

  In Fig. below, what is the velocity a (ky1q9fy ou( cur-4dbt t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.0 s?axj 0 s;w0 t3j57(l 3pvqncyjb

  In Fig. below, what is the average velocity from 0 to 6.pwx7 ,fo*qh: h0 s?

  In Fig. below, what is the acceleif 8goc(9q7hlration at 1.0 s?

  In Fig. below, what ieao y1z 8+0n2nnh,kins the acceleration at 3.0 s?

  In Fig. below, what is the average accelsrtk/b32b r y3(vb* aeeration from 0 to 5.0 s?

  In Fig. below, what is the average acce vi.vj2rbuupeyx..8q 4n 8hoe4 wuy+/ leration from 0 to 8.0 s?

  In Fig. below, what is the disp yy2nbp2hvyc) z(z+l 5lacement from 0 to 8.0 s?

Does a car speedometer measureaqp , k*yv4r0hx +pc:x speed, velocity? {speed|velocity}

  An object can have a varying speed if its velocdyj-mypio6n vi7+j -kn thq7 n12)r:eity is constant.

  The velocity of an object canpy+m ,drxr*h;o ql:8p be negative when its acceleration is positive.

  If one object has a greater speed than a second object, the fir )nelsh g8s:qr;jib/) st must have a greater g) h s/sen8)bij:ql;r acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling with a speed oa73 z+bxkvddz ,;i6kof $60 \; km/h$ 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 acczlxp9 98vx-w4 rull l;eleration decreases.

  A baseball player hits a foul ball straight up into the af uf 21bzb-lr9/gq-ns pe)sh*ir. It leaves the bat with a spess f-eb) *-lf1hbq g/ 29pnurzed 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, whaf)2l4 o6gkat1efy7 8bv/h bv4uyf 6ert is happening to its acceleration, how does it change if air friction 16/ e4a)otfre42 g7 vvbyl6b uf8k fyhis ignored?

  As a freely falling object speeds up, what is happening to its aahgmzj4 6 , ;xtg:7r nbxj0g7qcceleration, how does it change if air tm7j abx 7 grh0nzj ;6x:,gq4gfriction CAN NOT be ignored?

  An object that is thrown vertically upwy) lai*,f +xytyrwr8do6:b 8pard will return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, hoyy+8ry8*x6lor wita pd,f: b)w will this result be altered?

  An object can have zero velocity and nonzero acceleration at the d b4n nxglqjn)z(/*qc/yk 05wsame time.

  An object can have nonzero velocity and zero ax /s c;,y4, csapa:tikp pda,p+h4o7ucceleration at the same time.

  An elevator moving fric ,q8bnxs 0 chlc;e*6hd1h .xom the second floor to the fifth floor making no stops along the way has zero accelerationhxh i0 dh;nc*e. cxbl6,scq81 all the time.

  A rolling ball moves frk7/ ge j)n9pnbom $x_1=1.6 \mathrm{~cm}$ to $x_2=-7.3 \mathrm{~cm}$ during the time from $t_1=1.9 \mathrm{~s}$ 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 $t_1=-2.5 \mathrm{~s}$ is at $x_1=2.8 \mathrm{~cm}$ and at $t_2=3.5 \mathrm{~s}$ is at $x_2=8.0 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a qua5c6cbba0za 2h,t sl- wrter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.3 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away fx34)5j5ijciup;o b58tjnv v irom its trainer in a straight line, moving 114 m away in 13.9 s. It then turns abruptly and ;n tvo4i)u5 vjbx 8cip j5i53jgallops 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 from 6csqx /z *lx,y$10 \; m/s$ to $24 \; m/s$ in 5.1 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 fromk4swmddzr . nbd aj+ylv,738, $23 \; m/s$ to rest in a distance of 74 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed5zcvn0q+t1a l of $29 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.2 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to ess7ufm(g fikstm-x7 l-0 +o;zhrentially top speed abouht+r-(0f7lmksi fz7ox -g;mut $10.2 \; m/s$ in the first 12.1 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 spo+)9 vtu4l6ex j 9ez -giqfu3leed of $19 \; m/s$ to rest in 5.33 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 on7eo;/a2 z lhr+k eitl3 the highway. Assuming a deceleration of e+3l/zo2 ekl7t ;ar ih$7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goin8el9lxyd 8lc0uo. d8bg $25 \; m/s$ 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 compit3xg0 lvyjme /v)v 634gxr4tlete the 10,000-m run in less than 30.0 min. After exactly 27.0 min, there are stil3 g/xvjryimx0lg) e3ttv4 v46 l 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?    $s$