Suppose that an object travels from one point in space to anoth jt.k 6z3/)2crrq zmaher. Make a comparison between the displa2z3q./ht)mcrr a6zj k cement and the distance traveled.

  When is the average velocity of an object equal to the instantaneous velociv+kn pq9. x/pity?

  A new car manufacturer advertises that theb/sp,(jdtodf z 73:ukx/ jlq8ir car can go "from zero to sixty in 8 s". This is a description oz t:/xu7l fd,o3jdqp j(bks 8/f

  An object moving in the +x axis e+ c,6avubd618eipzlo2w .re uxperiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) b, ycwy6 pck61w xhuku *u)-(oaegins to slow down as it approaches a traffic light. Make c-( w, 6ukx*6kouhp)1awycyua statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins tfc6s3nciv* 7l o slow down as it approaches a traffsvcf3 l i*nc67ic light. Make a statement concerning its acceleration.

  Suppose that an object is mtr)l i,3xcu5)wuzg7q oving with a constant velocity. Make a statement concerning,cz)luwur q7 5i3txg ) its acceleration.

  If the velocity of an object is zero, does it mean that the acceleration is zec-kbeo96hsbyosb:l09tu n1 ) ( eac(wro? Support you6o)h(e: - es0k9ocwat9cluyn sbb (1br answer with an example.

  Can an object's velocity change direction when its acceleration,.:tjvv3xm ;zh0j jrl tf*o*s is constant? Support your answer with an rz f30m: svh lv**ot j.jxt;j,example.

  Suppose that an object is moving with constant acceleration. /7+t;tx7xtb sb tygmhut(rjq-(d-z8b ,a q)l Make a statement concerning its motion with resg ,;ht tq7r 7dsbt x/am (8yqbxt( -ztjb+u-)lpect to time.

  Can an object have increasing speed while its accele qfy+d:ix.0ur ration is decreasing? Supportxd+0r: u fq.iy your answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice.vd.8c eo u2mv/ Make a statemente 2d/8moc.vu v concerning its acceleration.

  Under what condition is average velocity equal to the average of the object'te,oydjrd9m-4sh , m7n/ x(f bs initial7nh(,dbexmd jsr 4tmy-9,of/ and final velocity?

  Objects A and B both start at rest. They both 7m ad4ty4kun08(q dxaaccelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final std an mx7ya04(kud4q 8peed of object A compared to that of object B?

  Objects A and B both start fro a jvds r ;57r,4dbi:;fnqqt8km rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled byb ;qt,f:n8rrvsk7 ;4ddjq5 ia object A compared to that of object B?

  When an object is released from rest and falls in the absence of frictxl/tp7p+s;ti wu:lk,t 10zbc ion, which of the following is t: tbptw;7 0xu1stp/kc +lli,zrue concerning its motion?

  When an object is reley3r a o*9.z.tdgdfs tk d.5oq/ased from rest and falls in the absence of friction, which of the follaog/to rst3 d5y. qzf. .9d*kdowing is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about tndxt*c6e-r+ihs ; 5rrp 1lx2jhe velocity and the acceleration when the ball reaches the highestrx;s26ct51r-ie *+lhdj xrp n point.

  Suppose a ball is thrown s(r.,yu zy +x36xdqt jptraight up. What is its acceleration just before it reaches its highpu y.+36q yx,xrd(tjz est point?

  Suppose a ball is thrown straig5cjm+s ,:p mwk/4krv yht up, reaches a maximum height, then falls to its initial height. Make a statement about thcmkp,/:mswk5+4y jv re 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 qn0:mhjb, 70*zzwd j(fsxvc 9 initial height. Make a statement about the direction of the velocity and accele9wvc0h*0qf( s,jz:n dx bmz7jration as the ball is coming down.

  Suppose a ball is thrown downward in thb 8 yylq)m7nptt,b,x4 e absence of air resistance. Make a statement cbltbq)ptn myxy4,7 ,8oncerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her accel7jw,,q0b ng ateration when she sg70 nqbat,,j whe reaches terminal velocity?

  A ball is thrown vertically up tyd;y4/sye4 d.u*)fca5 t d,3vholvoward with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of thedfyy at t*d l5.yo ,;)vovde3hcs 4/4u 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 the top of a building. One secow)bx2daao *):b9b by 84yutbi nd later, ball B is dropped from the same building. As time progresses, the distanc)bytobxua8b yb*9 2d: 4wba )ie between them

  Ball A is dropped from the top of a building. One secop6k kvxi3/.e.j; eaeig udd6 7nd later, ball B is dropped from the same buii6d.k edku.eg6v ;7ap ji3ex/lding. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall buildin 0opq9dq/rsew 4kxf dc4ibi b47:y*)d g. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit/rd q:0dq*94opiy dbe w4s bck7i4x)f the street?

  A brick is dropped from the top of a buil*xllp-h. rr xmzd.c0(lk6a; lding. A second brick is thrown straight down from the same building. They are released at the same time. Negle.lx;cxkh6 rllm 0p(*.-la zrdct air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant nq nki lx,t96 r937aay7 r,nywmon-zero velocity in the +x axis. The position versus time graph of this object,96a 7t7n9i 3mqnxa ylkr,ry w is

  An object is moving with constant non-zero acceleration in cf(toi6 yh*s)the +x axis. The position ve*)itco s( h6yfrsus time graph of this object is

  An object is moving with constant non1kytogup 1tavqqq 5131.r a2n-zero velocity in the +x axis. The velocity versus time 5k1ptuq ayqo3 1q1r . t21ganvgraph of this object is

  An object is moving with constant non-ze:; xtroqi:kb6 ro acceleration in the +x axis. The velocity versus time graph of this ob6xt :bq:oikr ;ject is

  The slope of a position versuq0e1ku 0 ,z4oq*(ba rrgybk 8is time graph gives

  The slope of a velocity versus time graph givesv9g vw5,oey g8

  The area under a curve in an acceleration versus ti ;t j.qy)l+n 1mvx)-isw bxgu;me graph gives

  The area under a curve in a velocity versus time grahz9+9r 1yb ib+* myqifwz1n2 qph gives

  If the position versus time graph of an object is a horizontgc e:vyhr+ *p(o6ed5z al line, the object isd yc5he6+zr*ve:opg(

  If the position versus time gr.-vaj/p mjx tqcm7 4s+aph of an object is a vertical line, the object ismtqja4jp+xm7 v-c s. /

  If the velocity versus time graph gi2uvl8rr y;q7ar.wplc* ,b 9of an object is a horizontal line, the object i;u,iy 2 r plw8lqabvcg97.r*r s

  If the velocity versus time graph of an object is a straight k4n g qd91:u wvxkkk(kf.xj*xb. h5e6 line making an angle of 30 degrees with v*x1kd 5gq e6.xhb wuf.x9(:kkknkj4the time axis, the object is

  An object moves 15.0 m north and then 11.0 m s(e7ak9 1 6fhn9llyt3ee3jx:g c7 vqhtouth. Find both the distance traveled and thqc:kvhnh e9f6lgat7e 39ye7jx1tl3 (e magnitude of the displacement vector.

  A boat can move at 30 kmtx4dl4b,a4iv( l m;w qw3ka: v/h in still water. How long will it take to move 12 km upstream in a river flowiw:t3wm(xb; vlldai q4k a,v4 4ng 6.0 km/h?

  55 mi/h is how many m/s?m 40-ltzinml1 ax7(hf (1 mi = 1609 m)

  What must be your average speed in order to travel 350 km in 5.p529dgz2cuv: i k cqoi.7g2ra 15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 m klyn;ouyni0 xdpw ;x)04/yh 6in. What is the average speed of thex60oih/)n0y; pkwxn4u; yyl d runner in m/s?

  A car travels 90 km/h. How long does it take for it to trave i ano*4vuz;;nld-u;el 400 km?

  A ly (light year) is the distance that light travels in one year. The speed of .gg 3mq2r(y , ulvspc3li3 2v 3lpcqg ,.m(rugysght 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 straight1mw i)rdabxg4i9mo*ck8w4jdk6z f e( / q-x,e road and you look to the side for 4.0 s, how far do yo)wwmiz1c-/ee k6 iba4m(x9j * xrgdq8,fko4du travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, your avewjn o7nx ,zj2( y.l4inyzo5;tra .zy(,otl;joznj 2x iwn45y n7ge velocity is

  A polar bear starts at the North Pole. It travels 1.0 km south, thyxhg qjdv uvu8,3du:(,xd) f.en 1.0 km east, then 1.0 km north, then 1.0 km w ujf ,vq(,) xgyuu.hd3:vdd8xest to return 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 t-;l 6ihrb)b bnravels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km wes)n;bir6h- b lbt 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 sc cswo bwy+ /;txykd)p 9/6v*buhool 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 m c)su9yk//vpyb xw;+odt6 b *winutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/hns hgt0q.ft: :6gmc 9wdb)u *q. What is the average speed of the motorist for t d: wst:g)bq.g 06mcnu* qtf9hhis trip?

  A motorist travels for 3.0 h at 80 km/h*ft1u:-mdd 8 bu3m 4xi5aaagf and 2.0 h at 100 km/h. What is her average speed for the t 1udmi3f8adab*a54-: fg mtxurip?

  An airplane travels a vgvm :: i g3w8ry(34mm8xiq uo(o9usxt 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 mgm i(mx9q48w u8x: :vouivysr(gm o33iles. What is the average speed for the trip?

  In a 400-m relay race the anlb e95(ksn ; )7jikzwcchorman (the person 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 lead the team B runner can have when the team A runner starts the final leg of the race, in orde 9jcwk;7nzb5l) is(ker that the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop after 9 s. The car,lyr1m4/uxafm jr5d 7u4+ gni's average velocity d1uj+m i /ydn5a7gx ru44f,mrl uring deceleration was 46 km/h. What was the car's deceleration while slowing down?

  An airplane increasexdy- 9/qz6s urog*+f ds its speed from 100 m/s to 160 m/s, at the average rate of ygxs foq/u- 6drd *+z9$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate of ck,cox 6vl*0nzb mhep7d. qgxg.s9,,$2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from restj z w7t lp4;(xka;om)e and accelerates 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 *gd fau+*g( dhf;exg;m/s for 10 s. It then speeds up with a constant acceleratioe(gdfa f+g x*gh*u;;d n of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial veloci fyr:h4j)tg waes:4k3 snn+ j6ty of 2.8 m/s experiences a constant acceleration of y kgw63:s 4sae)h:rt+4n fjnj$3.4 \; m/s^2$. What is the cart's displacement during the first 6.5 s of its motion?

  A bullet moving horizontally to the right (+x0 k+m zsg n6kl1ti/tjr)iw 6mvuv,l,( p1)gzq direction) with a speed of 219 m/s strikes a sandbag and penetrates a distance of 50.73 cm. What is the ave 0r,16j6tm ,))qlz lniwmzg/s1k+ g t (vkupvirage acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane iw m/sbtlm8/ t1e- dcc*s launched from a catapult on an aircraft carrier. It reaches a speed e ds8wlt/-c /c*mtb1 mof 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 catapult?

  A car starting from rest moves witlmq.cd83 kz 9kk b.5xp/hk3rn h 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 a distance of 200 0lkvw q u:5p0+ac0ldg m. What is its average acceleratio uc pwalk+d00vq: l05gn?

  An object starts from rest and undergoes uniform tlw (31*rnx iuacceleration. During the first second it trlt3* nr uw1x(iavels 6.3 m. How far will it travel during the third second?

  An object is moving in a straight line wi;hjvm6v ch0 dkr8(k9dth 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 ddr8 h6mk9;hj(vkv0c this time?

  A car starts from rest e1um9dryr;8t6me kyp3c um3 9 and accelerates 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 on a dry road rq2 foztwr 5cghkk)u0 i;4e8 1can 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 trafficc0qof7u ;u ;ca light turns green, a car that has been waiting at the intersection starts ahead with a constant acceqoa0;7uuc ; cfleration 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 1f2dt hh e*m. e)q)fqw)2 m/s on the surface of planet X where defe*h)) f2.t) wmh qqthe acceleration due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward w2qv ;zqq.t5nv ith a speed of 12 m/s on the surface of planet X where the acceqqq nv;v.2 z5tleration 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 planet X d*k8sc.4csf ejd(1wg where the acceleratiocdj *s8fgw14s (.c dken 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 upwa,erk:r. x6 wd,spxj 5 k9qtd5rrd with a speed of 14 m/s on the surface of planet X where the acceleration due to grav xk: ksd5qj rwpdr, 9xe,6t.r5ity 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 yozd a6yd33u d.qur friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before qu.d36 adzd3y you catch it?

  A ball is thrown upward at a velocewr xu,+w0m1 xfdl2 c7ity of 19.6 m/s. What is its velocity after 3.00,e1+r7m2cwxd0fwl xu s?

  A bullet shot straight up returhtkc;- n-( 1xno5 kojhns to its starting point in 10 s. What is the initial spee(j-nhk kx-t1 ho5onc; d of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it tak s-dg cu;u0pl.e to return;cg0upd .sl-u to its starting point?

  A ball is thrown downward fr/y wp-t:hlqm /om the top of a building with an initial speed of 22 m/s. pm/ ty-l qhw:/ It strikes the ground after 7.6 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numerical oeill io.,dvtf;zr8kc ):m. 6value in the zfl). 8r,d:o ie.c6k ol;mtivblanks)
(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 of 44.9 ag,25zodh) w s6ngb z83(dki hm/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 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 velocinh5l h:46hldr ty at t = 1.0 s?

  In Fig. below, what is t ujy g+g+9em::ux2 mjthe velocity at t = 2.5 s?

  In Fig. below, what is the velocityt;7 he;zg ybmz;jj ,x/ at t = 4.0 s?

  In Fig. below, what is the tr k(t *l 5xrbqf)1l+:3hy epqvelocity at t = 5.5 s?

  In Fig. below, what is the averagn ;d e: (tjtji/hs/7wsow;2py e velocity from 0 to 4.0 s?

  In Fig. below, what is the average velkiviht 2ru5(fznc a/9v5kx 7-ocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 jr 3w88:nyq6kp dape.s?

  In Fig. below, what is the acceleration at 3c0sv*ma ynqp93)gbh w8 6 j4wm.0 s?

  In Fig. below, what is theb aqm *0 df1-(wmtq+mzv )ox.e average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 7v c+p9pfxe3ylb 8 3ir-c l0i8frm1 fzto 8.0 s?

  In Fig. below, what iseky e (rc8+ls3 the displacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|velociyzm phvk+ qkk997qqs: w n9(2ity}

  An object can have a varying speed if its velocity is consttwqttzk3 x8ip / ,-l(yant.

  The velocity of an object can be negt2)q,th* l rziative when its acceleration is positive.

  If one object has a greater speed than a second object, the first must have a grh ;0vl 2xzk.mpv x0h plm.kz2;eater acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling s7ekhju() u ily+qc51with 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 increa1 4zan1e bf vzvdsr -(2x)xoj7sing in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the k,d52a1tel,g8 9mmb3g daaik air. It leaves the bat wigd9bkim l25m1 age tak8da,3 ,th 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 is happening to its ac f1s/kw .a coq/85mf(nb1aaicceleration, how does it change if air friction is ignia/m 1s( ffcn/851aabwq co. kored?

  As a freely falling object speeds up, what is happening to its accelon;pi3 q.lvv *eration, how does it change if air friction CAN NOT be ignorvqvonl3i *.p ;ed?

  An object that is thrown vertically upward will return to io+zq 1+do7 xpxts original position with the same speed as it had initially if air resistance is negligible. Iz1 dox7oq+p +xf air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and n +unt ccx79o dho w;bb*nbxvn)0(u*z;onzero acceleration at the same time.

  An object can have nonzero velocity ana l5qd4 rp*x3 enee*0ad zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making no stoehhg j*ezx6box4 a4n-,(zrf:ps along the way has zero aczh4(6rfhjo,a*x4-z gxe:en bceleration all the time.

  A rolling ball moves fr2v-3 zyoq 8bklq)5id qom $x_1=3.3 \mathrm{~cm}$ to $x_2=-5.1 \mathrm{~cm}$ during the time from $t_1=2.1 \mathrm{~s}$ 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 $t_1=-2.9 \mathrm{~s}$ is at $x_1=3.3 \mathrm{~cm}$ and at $t_2=4.5 \mathrm{~s}$ is at $x_2=8.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight completecf wh+wo/al ,12r6sow laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 9.3 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 107 m ic 6-q .su*5zidken6wd:4hdsaway in 10.1 s. It then turns abruptly and gallops halfway back in 4.7 s. Calculate iuq6d s4e *wdki-.z:hcnd 56s(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 fr,uqj0t13ufef x; q6xgyoud4+om $11 \; m/s$ to $23 \; m/s$ in 5.2 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 fromhq y3(9a zu qh19n6o:.omt h1xxnj+hb $18 \; m/s$ to rest in a distance of 71 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach ap+x ,n ,3qbviscwnyw x*.qo(0 speed of $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.7 \; m/s^2$ ?  (数值)  $m$

  A world-class sprint 37j,/ mlr qbw8z,iudher can burst out of the blocks to essentially top speed aboutq 7hlb,3rmjz ,udw/8 i $10.4 \; m/s$ in the first 11.2 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 s c ;vx: 5xcynxthm),t+peed of $16 \; m/s$ to rest in 5.10 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid r6 s aaiwbww-350h. pvmarks 92 m long on the highway. Assuming a d6 05pa .s rbwa-w3wivheceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going qi4n(6h2dt,e*ct;j (da9re fv l /q iy1:fbod$25 \; m/s$ 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 thanou +o*s aqix3+ 30.0 min. After exactly 27.0 min, th3xio+q*s au+ oere 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?    $s$