Suppose that an object travels from one point in spgh6.yuee f 0jelzx v7m .;(y4face to another. Make a comparison between the displacement and the d fm ;7 6e.vh0j.4 ef(zxyyelugistance traveled.

  When is the average velocity of an object equal to the instantaneous vey-8xizl(he9mrq 8 ih*f31so vir3wd 6locity?

  A new car manufacturgfal,dcnq 1wj6- /0vs er advertises that their car can go "from zero to sixty in 8 s". ,1 gfca 60qj-nw d/svlThis is a description of

  An object moving in the +x p;4( lqy2zv7cignj+:ctagis l, , /awaxis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling5ft5bma5*d vhq dkz6*tn nm :5 to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleratiobdt5:d5v**t nmhma556fqnzk n.

  Suppose that a car traveling to the West (-x direction) begins to slow down as u f /kqjt a;+0xhqi/(7hhc8 lsit approaches a traffic light. Make a shqx(qa87k +ul/hji/ 0fsh;cttatement concerning its acceleration.

  Suppose that an objecuyl.cv k(6 bpbsa79h+ t is moving with a constant velocity. Make a statement concerning its accelerati pb k9b 7usach6.y+v(lon.

  If the velocity of an object is zero, does it mean that the acceleration if y0vf1+(hl +jj*cb;cgmbz1 zs zero? Support your answer with an example.h1bjyzf(c;+v1gf *czj 0l+b m

  Can an object's velocity change direction when its accb99uj,ssp1 n celeration is constant? Support your answer with an n9 pjb1s9sc,uexample.

  Suppose that an object is moving with constant acceleration. Maj x89q c7)lr nz1xj d;/1pyagho;afx2ke a statement concerning its ;n ;/rxj afx7adphjy2 x8 zo1q1lcg9)motion with respect to time.

  Can an object have increasing speed whilcj) 9rqa3rqhe fab/61q9e1i8 zk7xw pe its acceleration is decreasing? Support your answer withfjeba)r3pz q9cq/w kah1q r8ei1x96 7 an example.

  Suppose a can, after an initial kilz8bj9s m/y zb l/3v+rck, moves up along a smooth hill of ice. Make a statement concerning it8 mysb/ljzl+ 3/b vz9rs acceleration.

  Under what condition is average velocity equal to the average of the object's iu9 xvw1/-ps efla9 j,bnitial and fina1/, xs 9fpvue9-jaw lbl velocity?

  Objects A and B both start at rest. They both ab,4m,d- jq dtc -.umge98f pprccelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared-rcub ,f9e -q,8.jp4pm tdmd g to that of object B?

  Objects A and B both start from rest. T)*8bzmj/ cfkkixb:75jv2aezcn4 i-hf / ghb/hey both accelerate at the same rate. However, obj/b cvanjik4 g2hb)xk 5z ff/: m-zj/c*eb78ihect 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 frictionh:id +taqwa,4 , which od+hwq,a 4 tai:f the following is true concerning its motion?

  When an object is released from rest and falls in the absence of friction, whic1m*xr l mn085i9bftxq 0,iiulh of the follom lfx i859i0xtni r,0q*u1blmwing is true concerning its motion?

  Suppose a ball is thrown straight up. l8qjza0 p +/r:r vf uku./wnz: Make a statement about the velocity and the acceleration when tkf8/r.u0rn:vwz :a lqpuj z/ +he ball reaches the highest point.

  Suppose a ball is thrown straigh f7v- c6:ihivmq,rsa(fx 9 ,b t*zfp-wt up. What is its acceleration just before it reaches its highest zq(f-9*:6ab-vf si, mtxhr,ci f7pwv point?

  Suppose a ball is thrown straight up, reaches a maximum height, then falls todx5r8 v2cm b9b8a-zt-: x,oc ;dqtbb b its initial height. Make a statement about the direction of the velocity and acceleration as the ball is goic5qz9b tb8bx - ratb8b; vcox m2d:-,dng up.

  A ball is thrown straight up, reaches a maximum i wa3*zn6uhp 1height, then falls to its initial height. Make a statem6hzu1*pna 3 iwent about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absqv -lj6obd;6 izu3gt:ence of air resistance. Make a statement concern: qt3ol6vd;6jb ig- uzing its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her accelerat40mbl59b1mp oa m0ati3x 3qvf ion when she she reaches terminal ve0i3a xpm9btv q 0olf 1a3mb45mlocity?

  A ball is thrown vertically upward with a speed v. An identical second bal*odmq9e( mlu6ju1e.ul 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 t 1m julemed(q9uo*u .6he first ball?)

  Ball A is dropped from thec- twe nlu wmchk66*ux9b*g fm2 t01u( top of a building. One second later, ball B is dropped frc 26t6- 1mutfw09 unewg* lhmuc* (bkxom the same building. As time progresses, the distance between them

  Ball A is dropped from the tgp/y bl8i qhql ;lw5dfvaum. 2j.41v0op of a building. One second later, ball B is dropped from the same buildinvqjah p1;0wl2.g b8l/lfdq mui.y54 vg. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building.4)hd csa m sctz32v)4l One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit the ss3 vc mt2sl))4hzc 4adtreet?

  A brick is dropped from the top of a f8ayt; 7omykxy8s d yw k-)(/ubuilding. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. yodkxy tmu)88k-;s/7 (yayf wCompare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity gw0+lr (.ds 3.uuozclu (adu5in the +x axis. The position versus ti+s(lgduow 03.da c5rulu ( .uzme graph of this object is

  An object is moving with constant non-zero acc-(g*u fdq vs lcl)nd51eleration in the +x axis. The position versus time graph of this object isv)fq1dcdlul( g5 n s-*

  An object is moving with constant non-zero velocity in t v klc qhgkoun/0 c1+:+)j6dcphe +x axis. The velocity versus time graph of this object is:6q/ plo+hu1+ cjcd kk0cng)v

  An object is moving with constant non-zero acceleration in thezqb)qz wbf 6847n d(tzuynm.- +x axis. The velocity versus time graph of this onum7wnzt6q.y () dfbzqz -4b8bject is

  The slope of a position versus time vlgycv5 1drd9,ok4w8graph gives

  The slope of a velocity uv7d:xc/vd4 k -5xtrsversus time graph gives

  The area under a curve in an acceleration versus time graph g7l7w4.lqdy a pives

  The area under a curve in a velocity versus time graf2ddh1ir x.)bmh 1r1aph gives

  If the position versus time graph of an object is a horizontal line, the oie t+:q4pnt)g ztzwjt 0a8,)ybject isitpw) tn8 z0a: tz+ty4q,je)g

  If the position versus time graph of an objh8lpd t96 kjgnp/(: ,/tfda adect is a vertical line, the object isf gd dpad(:,p8t96a/ /hl jtkn

  If the velocity versus time graph of an ob c1/l3 (twx)kwgg wkan2z ,(ggject is a horizontal line, the object i3w gg/t2k(gzn (1k,la)cx g wws

  If the velocity versus timu:q j-sjg r7/efi0l6 yo:gpb1e graph of an object is a straight line making an angle of 30 degrees with the ti1 0o-y ui6j7j sp/eggbf :lq:rme axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both t /vx da5x,,xulhe distance traveled and thv,xx5a l x,d/ue magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will itab5moozm;aoo a(q b,8;u 31p p take to move 12 km upstream in a river flow,m3uo 8 a;bz pp b(1;qooao5maing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 19. pw5;cw 5pgcdmo;vqf/to,56 fl lwg609 m)

  What must be your average speed in oruv. k01zp jh*uder to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) ;ce9 7)klhjttw)5dhg in 2 hours and 57 min. What is the average speed of the runner itk5)wt; jhdc)7lgh e 9n m/s?

  A car travels 90 km/h. How long does it take for it to travel 400 km?-z068mxv2fqng kat k5hn*sm 9

  A ly (light year) is the distance that light travels in one year. The specijx+jr88g 3ded of light 3jdci88+gx jris $3.00 \times 10^8 \; m/s$. 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 p +0)7npyon emyou look to the side for 4.0ey 7p) np+on0m s, how far do you travel during this inattentive period?

  If you run a complete loop around an ouk ,ancw *(5lz. xrlpwm)5x ,ietdoor track (400 m), in 100 s, your average velocr w e.zc (xklnlim55p,*,aw)x ity is

  A polar bear starts at the North Pole. It travels 1.0 ; jscs- e7f7j/6mjerlkm south, then 1.0 km east, then 1.0 km north, then 1.0jme6 ls/f7rs7 j-;jce 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 * k,ujn evcwo3 +b00/iiqv sb(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. Thi3,bo+e(c*s0q vk0b /wjiniuv s trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend zvxlm- kh -5m:from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. m zklv5x:-- mhYou arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 8u e2v.hn,xo4e 0 km/h and 160 km at 100 km/h. What is the average speed of tn.x2h o ev4eu,he motorist for this trip?

  A motorist travels for (mfsfis(o,5sl4 o)t x3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the trip? os (,sffs)oxt5l(4im

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h noruv6f k 8:fspj:pbo: 4au lg6.zth for 750 miles. What is the 8s z6oufk:g p.pbul f6j:a4v :average speed for the trip?

  In a 400-m relay race the anch h4d qt i(-avwi(t3ta;orman (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 larg4iv d (q-ittt(a 3ha;west 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 and comes to a stop after 9 s. The car's avj8 ) r jq9hwh3qff*).-nu ggpuerage velocit ug).39hun*f -q fwrpj8h jgq)y during deceleration was 34 km/h. What was the car's deceleration while slowing down?

  An airplane increases its s 4i7ewy k8o/frpeed from 100 m/s to 160 m/s, at the average rate of /k7o4yf8wr ei $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acceleratetm5cxe af: 4:pf(.ot(e vlr1 us 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 a jpte7a4,ck): 2 xxrkruov/8knd 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 m/s for 10 s. It the v36fvq(ow-l:aiye x9oi. oh* n speeds up with a constant acceleratioo9oq(w- e:liv yov xi 3*a6.fhn 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 3.8 m/s experiences a constant acctroz ,5st )ld(eleration of str o z(,tld5)$2.5 \; m/s^2$. What is the cart's displacement during the first 5.4 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed4go;z9 rk t+f.vet:xf7e 9 rc2enbxw. of 406 m/s strikes ae+ e;7tn:o.fx4c9g txer9r2w v.zkbf sandbag and penetrates a distance of 80.13 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrier. It tzf- xs i:* k/7hmm7xotvd90lreaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleratvfx :z7oh / d m*k7il9xsm0-ttion is constant, what is the length of the catapult?

  A car starting from reagl2 yt57b sj6st moves with 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 q /a l8(+d2l ajj/bftcdistance of 200 m. What is its average accelertd c2afj(/lb +jq8l/a ation?

  An object starts from rest and unde64q snk i;att ak7tu1;rgoes uniform acceleration. During the first 1;kt;s6ta4ian7qukt second it travels 9.9 m. How far will it travel during the third second?

  An object is moving in a straight line with const1/ izkrywp2,z ant acceleration. Initially it is traveling az2i 1,kwz yp/rt 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accele(+ zwgdioil i mbo5,6(.i9mz srates 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 can decele,,siz1o411cn s fc ka4 lpbff*rate 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 waitine:jn/1ppm2: kduop5 skfnw; ,g at the intersection stap,mj 2p/:kfskn; nd5pow: u1erts 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 . tdr7 1p*put9nk ov-dm/s on the surface of planet X where the acceleration due to gravindvtd*9kt1u-p r po .7ty 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 planet X wg/xlr y,0,lm0qmgu cq2/ 9twy here the acceleration due to gravigcw9 r0t,ym /x2l,ugqlmq y/0 ty 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 wpg,.1i rcqoh0p)avd20v p;hsurface of planet X where the acceleration due to graa iwp0.1prv0)vp d;ogc2h h q,vity 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 14iy-flo5; c qd, m/s on the surface of planet X whef;q-yl c,o i5dre the acceleration 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 holds a uqk(pgswp(s +mq*h ;(ruler between your fingers and releases it without warning, how far can you e* g(p+uw(;sm spkqqh( xpect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity pns50n89d fzwc3 i j3yof 19.6 m/s. What is its velocity after 3. j9s35w 0c8dnpinyf3 z00 s?

  A bullet shot straight up returns to its starting point in 16 s. x:q5ca4vysfq,9ck did/0 j-s What is the initial speed of the b4sk5 ,9jcaqx -ci:v d/d f0qysullet?

  A ball is thrown straight up with a speed of 36.0 m/w7j k2rrg36bb; ts)z ds. How long does it take to return to its star 6 3r2b b);ztgksjr7wdting point?

  A ball is thrown downward from thdot.,h spl 6+me top of a building with an initial speed of 21 m/s. It strikes the ground after 7.4 s. How high is the buildinspm+tl .6 odh,g?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numericalzmpo*o +va+v; value in to+; v+azp* vomhe 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 into4z 2)ctgv92pvqqt*b+,oc bmr the air with a speed of 38.1 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 8 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 8.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what isl ng9pd-iqxy /v0vdl+uh 9(-f the velocity at t = 1.0 s?

  In Fig. below, what is the vek cqt+2bwl8a0locity at t = 2.5 s?

  In Fig. below, what is the veloezvfgcl4 g/u7,k s 33dcity at t = 4.0 s?

  In Fig. below, what is the veloc3x2dgk 7bz2jy: k;rfpity at t = 5.5 s?

  In Fig. below, what is the average velo oq; .c+gyo:dscity from 0 to 4.0 s?

  In Fig. below, what is the average velocity al+8,x -ogq(r 2i 4zpr/k;bk3conu gnfrom 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 j8 +zn ssku/4ys?

  In Fig. below, what is the acceleration7m (pxat:rxn+ at 3.0 s?

  In Fig. below, what is eojylm on0mwq0f278/ the average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 topclc,/lnb5 h*;zox ;o 8.0 s?

  In Fig. below, what is the displace fpy.rak:1z 7kment from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {spem *)cq.tkr+seb* ox +verg01jed|velocity}

  An object can have a varying speed if its velocity is ckej)o ; klo+w;zj2sninu1: 6c onstant.

  The velocity of an object can be negative when its acceleration is positivefesip:up3 l06: e7wrrr(roy5t-nz h ;.

  If one object has a greater speed than a second objecy0dw gl y5hhlub69m;/t, the first must have a greater accelera 90 ;mlbhg6hd/yy5w ultion.

  Two cars emerge side by side from a tunnel. Car A is travell(zzef0 kqg4x: m s0u2ing 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 dec9 qfqd-7p4/5h-gi,*3+fsydp hfc qj: p dbkto reases.

  A baseball player hits a foul ball straight up into the air. It leaves the 6irn-+ otqqdstc0x) kdg;*k;bat witk6;;doqtd*-x0c qti +kr)sn g h 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 acceleration, hosq , 4u 6f2u-ob,tulaqw does it change if air friction is iu u2 ,o,uqlb q6as4ft-gnored?

  As a freely falling object sp+3ag zoly i6zh593 l*vl tsnodfx+:-k eeds up, what is happening to its acceleration, how does it change if air friction CAN NOT be ignoredd ol3x+otfk5nllizg-v*sz: 6y +ah 93?

  An object that is thrown vertically upward will return to its original positionp504 fs si,g - kbw7w7)rublmr with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how fm7pbk5iw7),4wg -u rrbl0sswill this result be altered?

  An object can have zero velocity and nonzero aflz7d p0.otr-a,-bpst4y r 2ecceleration at the same time.

  An object can have nonzero velocity and zero acceleration at g /,80hbkqzhithe same time.

  An elevator moving from the second -ulfvo f u3 -vsh p21wfumzp+3k)3z: yfloor to the fifth floor making no stops along the way has zer y+wf 2fv3z k)o:f3- 3puuumpsv1z -hlo acceleration all the time.

  A rolling ball moves fromc1hr,esrfgb8 gy-8(e k1 oxo6 $x_1=2.5 \mathrm{~cm}$ to $x_2=-8.5 \mathrm{~cm}$ during the time from $t_1=0.8 \mathrm{~s}$ to $t_2=5.5 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.4 \mathrm{~s}$ is at $x_1=2.4 \mathrm{~cm}$ and at $t_2=3.4 \mathrm{~s}$ is at $x_2=7.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarte:yjs0jnpprp(4z; fhnct :- a k4vb.h(r-mile ($1 \; mile = 1609 \; m$) track in a total time of 11.4 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 str9fa;bfjg,h ))i (yqxz aight line, moving 106 m away in 12.5 szjfiyahb9)) g; xf(q, . It then turns abruptly and gallops 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 froy sy f;b(yo,/co1ev 6uqhh:( jm $12 \; m/s$ to $22 \; m/s$ 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 b 7xm22bc fpdr1+sf (z$18 \; m/s$ to rest in a distance of 69 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a spqd 9-a8l. v8v:1vnw qntl7slaeed of $29 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.7 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinteryu). ncv0rzph*ig-0)2 wze vpr 0k x0s can burst out of the blocks to essentially top speed abouxn.2 r-k0g cpwzyz0 ri0ep )0v )sh*vut $10.4 \; m/s$ in the first 13.9 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 speed owcyswyj (brm :.a )adc )u.3/69dqmi cf $18 \; m/s$ to rest in 4.87 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leavetzf i )6txp+(vltr ngj c+.(;-eczae 9s skid marks 92 m long on the highway. Assuming a deceleration of e+. +v)cr(zf9-jcelxzgpa( it ;t6nt $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck 6wg g a3 uxab1g61,f9m2 aen :pv4ybjjgoing $25 \; m/s$ 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 30.0fvr i0qv2+ n/,; ecmpf min. After exactly 27.0 min, there are still 1100 m v /2qc0fv,mn f;erpi +to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$