Suppose that an object travels from one point in spacebj 2m94 )wyzs0ehm1qo:f+z kn to another. Make a comparison between the displacement and the disnzqyw m)o 9j+10 2zebf ms:k4htance traveled.

  When is the average velocity of an object equal to the instantaneous velocityn ae2hh/ 7-m)+ypg amymr 8b rgmtf;6+?

  A new car manufacturer advertises that their car can go csgey s1kaby u.ni*/sp9:i, yv: mt:;xwp./x"from zero to sixty in 8 s". This isyax/iywu. pxskb ; s9tsy:mv ,eg./ :i:np1c* a description of

  An object moving in the i:c/ *mjo a e9nj7+9c0dr,r 5nhdbj kl+x axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow dow7ec-oazf d btf2h r(/ s*zfo;1n as it approaches a traffic light. Make a statement concerning its accelerattef(d;fzcoo7b /z 2*shfa-1 r ion.

  Suppose that a car traveling to the West (-x direction) begin )f.iphg:cdp b41*+mgsui 0gps to slow down as it approaches a traffic lighdi .10 ph*g+bs:gf cim)g4pup t. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a statement c m,8jsr o8.2ngye9t4v uvm kb8oncerning its accelerat8t,rvm 9bo2.nu vm84kejs8y gion.

  If the velocity of an object axqj 5l4:1yva is zero, does it mean that the acceleration is zero? Support your answer wi v45yjqla:x a1th an example.

  Can an object's velocity change direction when i/edtdarzujd+.5/ jq3 ts acceleration is constant? Support your 3+tujjd aq5.er z //ddanswer with an example.

  Suppose that an object is mo3o.boz+75mt ct / l( vidany.eving with constant acceleration. Make a statement concerning its motion with restz cn.(. blye3i /d +t7oaom5vpect to time.

  Can an object have increasing speed while its accelerat:lm3igc80qa n p(h upcj7g0;- wgupt-ion is decreasing? Support your answer wim-g3lc0a(:8u0ph tgc q7upgjp wni; -th an example.

  Suppose a can, after an initial kick, moves up alo yfosi8 6*b7gzt v e df9-t01jj3q3iwqng a smooth hill of ice. Make a statement concerning its accdjiov 7zf ti- qty1*08wsq3f 693gbejeleration.

  Under what condition is average velocity equal to the average of the object's i 159esd x0 /ue:mxcsl rt.;dwn tmx7(anitial and final velocity n t/( acl19 r;smxsd0mex:te 5x7.duw?

  Objects A and B both start at rest. They both accet-maun pc t28;lerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A com n28;-a tmpuctpared to that of object B?

  Objects A and B both start from rest. Theyo dj/g7k11ae r both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the dista /goae117dkrj nce traveled by object A compared to that of object B?

  When an object is released from rest and falls in the absence ofou*tt 86-fn(k0hkkol friction, which of the follon6kuo f kkhot8*tl0 (-wing is true concerning its motion?

  When an object is released from rest and falln1 60f3e :wwywiyu0h ss in the absence of friction, which of tn0i0:yef shw 1wy3uw6he following is true concerning its motion?

  Suppose a ball is thrown straight up. M l.bchl.yotdo p/qj( (3)1ooaake a statement about the velocity and the acceleration when the ball reaches the t bj o(l)../lydo(c o31ohapqhighest point.

  Suppose a ball is thrown straight up. What iscxl(6 hnh2d. z its acceleration just before it reaches ih26n z.(hxdl cts highest point?

  Suppose a ball is thrown straight up, reaches a maxir:y- gpj/eq z;;4dq mkmum height, then falls to its initial height. Make a statement about the direction of the velocity and accr qk:g4 yze /;d-qmjp;eleration as the ball is going up.

  A ball is thrown straight up j0ljm:8 reps., reaches a maximum height, then falls to its initial height. Make a statement about the direction of the vee 80prl.m :jsjlocity and acceleration as the ball is coming down.

  Suppose a ball is thrown dd*n ng-pqz7 2xd,b8 ls-djuh6 tth 66vownward in the absence of air resistance. Make a statement concerning its accelerag-*st26- h8 d6djznt lq6 7dx pv,nhbution.

  Suppose a skydiver jumps from a high-flying plane. What is her accelerationzp c05 8yyw;0bqj .t,wmjb4me when she she reaches term4m ;ejp0qwjwbmy t5z.cb y 80,inal velocity?

  A ball is thrown vertically upward with a 9bm;oabe9pz, mq0 f4s speed v. An identical second ball is thrown upward with a speed z;q0msbf,abeo9p9 4m 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 ball?)

  Ball A is dropped from the top cccmcs5 gz+68of a building. One second later, ball B is dropped from the same z +cc658g csmcbuilding. As time progresses, the distance between them

  Ball A is dropped frothb/u .z/hc n:5 ke di s.2-az8ys.pqwm the top of a building. One second later, ball B is dropped from the same building. As time progresses, the difference in thei ih.z/b.d :8/pua-khctsn 2wszy5 .e qr speeds

  Two objects are thrown frob p lj1:yk8qx (gq)*az;cth0cfw;vn / r;f7ldm the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What ar nf 81q a;rqlc t();hz;xwdkbc7f/v*gj0pl: y e their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is th v rlt5w(+kh6us3l9 verown straight down from the same bu9l+( htwelvv5rs ku63ilding. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with const-dk 2c v*d 2bpf*p2xhq/cn(cm ant non-zero velocity in the +x axis. The position versus time gra(d*mdnhc fpbq2xpc- *c2/v 2k ph of this object is

  An object is moving with constant non-zero acceleration in the +x a )nygw6xrzi( 6hjhi+g . 0nn7rxis. The position versus time graph of this object iy+i(xn)6 .r0 hirg 7jhg znwn6s

  An object is moving with constant non-zero velocity in the +x axis. Thmj gv:s 7w9+pu ztursaq).ki+m-v o2 *e velocity versus time graph of thi- mj:t2z +w7siu.vg svqu p9*r) +akmos object is

  An object is moving with constant non-wy7bg: m i5yu:zero acceleration in the +x axis. The velocity versus time giwm: u7y:y b5graph of this object is

  The slope of a positi wl r1hyb:,95x a3.xai, 2pjfh dad:rhon versus time graph gives

  The slope of a velocity versus time graph givvcp sdyg-2 g55es

  The area under a curve in ur-qkole79g n0kn .3ba r8 z7fan acceleration versus time graph gives

  The area under a curveu wl2tmx4ho 4.cs,vc+ in a velocity versus time graph gives

  If the position versus time graph of an object is a horizont h 3hbusi-;zr7al line, the object bs -; 3ir7zhhuis

  If the position versus time graph of an objnk m/ i z*jxmxhy*+6os,qsbpw.u-5(bect is a vertical line, the object is+s*x, y /mmju*bwnokpsi(5q .h zb -6x

  If the velocity versus time graph of an obwxskdrb0 o7l:v 9s9.j:e7lqu ject is a horizontal line, the object isxlsr 7sk9l:uvdj 0qw.e 79 :bo

  If the velocity versus time graph of an object is a straight line m.a+m 7/ aeypmgaking an angle of 30 degrees with thea+ eym./am pg7 time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both thhx6-;gzljp7ms x0d h4 e distance traveled andlh4 6zsmj ;h0g dxpx-7 the magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to movdl5m.3tae8 :ci z()o d0naoh fe 12 km upstream in( di):0a.z85 moe3l n thdcfao a river flowing 6.0 km/h?

  55 mi/h is how many m/s? 3fckmwr5n(l9umx ,b +s 6*btd (1 mi = 1609 m)

  What must be your average speed in order to travel 3ely1p+7o xf*0-s-k e h m7ajii50 km in 5.15 h?

  A runner ran the marathon (approxl gjv8epr;+ - 7k3micsimately 42.0 km) in 2 hours and 57 min. What is the average speed of the runner i;r-k lev8pcsmj +i3g7 n m/s?

  A car travels 90 km/h. How n 6es-ki:g nl(ll(r3plong does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one v o9vi (gq.pvues85-n year. The speed of n8eg5 pvvu .9iov-(sqlight 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 the sip+ 0 3xmu3bhq;yiq7hb de for 4.0 s, how far do yoqphi7hby 3m u;3+0qb xu travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, v.g7r;vfq 6 ,t+juy yjyour averayvr.fygqvj+,7tj u6 ; ge velocity is

  A polar bear starts at the North Pole. It travel:eaq 3a)u/tdw mh3uog7kv;9 es 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 o)k39 uaqmgd:aw/ e7 e;3uvth45 min. What was the bear's average speed?

  A polar bear starts at tn9 pi xy:s222lo (bsafhe 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. What was the bear's average ve2o:as(s9lnyx22pb filocity?

  You are driving home ovw28 lbrgm--*u-is isv1s 4d in a weekend from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. Horg ss viw- viilm-1d8-b4*s2u w far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 kmudb5xex 3o1b* hdg7n7/h. What is the average speed of the motorist for this trip?*x537g71 ube od dhbnx

  A motorist travels for 3.0 h at 3cfpbi+7p3rj +ake;a 80 km/h and 2.0 h at 100 km/h. What is her average speed for the trip?+a 3 ce 7f;ji+abpp3rk

  An airplane travels at 300 mi/h south fo j,(2 ek,u.yb 9uh)p rd*p.qdckbeq+gr 2.00 h and then at 250 mi/h north for 750 miles. Whaq.dcq2 e,dpjubg*9her k(up,+.byk) t is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the la2g0gtr ko/qnz k7y9tv. hhyt /8vz)a* st 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 o09g8yzvh gq 2)o 7 tn/vttkr.z /hkya*f the race, in order that the team A runner not lose the race?

  A car decelerates unifofb 5mhe(c, 8p* zfd0 qg7ku3larmly and comes to a stop after 13 s. The car's average velocity during deceleratiqmzk*5elu3 c(dga,8pfb f7h0on was 80 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed froer+ mtrr ,b:*mm 100 m/s to 160 m/s, at the average rate of rb*m,r+t:emr $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h as (dfw9t3i(ej9h b(5y,s vwkeccelerates 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 id s uk71tni5*f y/,l(vjb9lcand 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 then speeds up -n7nddr lhe ew,4,a4 nwith a constant acceleratiod,ean74n4dw-, r elnhn 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 ox2:;f8 ,fekzg qavj 0of 4.9 m/s experiences a constant acceleration of ,qo fgx 2:80k;jzfaev $4.2 \; m/s^2$. What is the cart's displacement during the first 8.7 s of its motion?

  A bullet moving horizontally to thf-, kvq 7fqi7ee right (+x direction) with a speed of 239 m/s strikes a sandbag and penetrates a f,ekv7-f qq7idistance of 24.87 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched fro88hrde jw; dh-rl6atc z1dz at.83 ox.m 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 isxrce83-zddlot . rd t.wha1h8a; 68zj constant, what is the length of the catapult?

  A car starting from rest moves with constant akuzw.f,) 0 urecceleration of $2.0 \; m/s^2$ for 10 s, then travels with constant speed for another 10 s, and then finally slows to a stop with constant acceleration of
-$2.0 \; m/s^2$. How far does it travel?

  A car goes from 40 m/s to 80 m/s in a distance of 200 m. What is n893ju b*k okndg0ffh, xd.)jits average acceler0jukndx)d , kfobnf 9*. gj8h3ation?

  An object starts from rest and undergoes uniform acceleration. D4ku8 ye 3oxqa,5 gv tbgz50gh9uring the first second it travels 5.7 m. How far w3vyu9gzb4,5ah eotqkg5x 0g8ill it travel during the third second?

  An object is moving in a straight line with consta6 s:o44r k(vo/htantwc nv)0 dnt acceleration. Initially it is traveling at 16 m/s. Three seconds later it i odc:h(rn0 w4tan)/ 6v4k vtoss traveling at 10 m/s. How far does it move during this time?

  A car starts from res; ow73 *iahbdile 8hsa.h:a m7c+j hj0t 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 o7bw;rwbu - (upn a dry road can decelerate at about $5.0 \; m/s^2$ when braking. Suppose a car is initially traveling at 55 mi/h.
(a.) How much time does it take the car to stop?    $s$ (only input numerical values)
(b.) What is the stopping distance?    $m$ ((only input numerical values)

  At the instant a traffic lighvi0vs;2rd/q*d yjti 6 t turns green, a car that has been waiting at the interry6 qidt si20v;/jdv *section starts 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 m/s on the surface of pld,:hqzg- (k qkanet X where theh-( zqk dg,qk: acceleration 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/s on the surface olf- pc4omo n;3obuv)1yn7q 3x61 *un *x tmwohf planet X where the acceu 4x-o3no hp;cltq1m67u3o*vo*w 1 mynfx) nbleration 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 oo wi jamk5+tibg3-() wn the surface of planet X where the acceleration due t5b aj k)t-ig3omi(+wwo 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 upwar fe98l o;my/tyd with a speed of 14 m/s on the surface of planet X where theeomft 9 y;/8ly 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 *c;o(cm5l wkyruler between your fingers and releases it without warning, how far can you expect the ruler to falkw5c*;cym l(ol before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its velo uv-fr 64tae;-zjq sxsg5-7su city after 3a6-xg-vrt7ues;4 j q u z5fs-s.00 s?

  A bullet shot straight up returns to its starti o *i;i/t58-iwd/bw o8,1 frl5k imlf ypmq7rcng point in 17 s. What is the initmf-ib clqomr8y75/ir5/*; i opd 1t kwilwf8 ,ial speed of the bullet?

  A ball is thrown straight up widsb sknxi,60w s zmdco) -5g06th a speed of 36.0 m/s. How long does it take to rbo n56m sg, cddsw)i0 sz-kx60eturn to its starting point?

  A ball is thrown downward from the top o;rjtnpjfs a 6) 512md) g3zpncf a building with an initial speed of 6 m/s.s)dc pjf3n 21 jrpg5;nmzt6 )a 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 numeie6t40tbv p0 35hjqvxrical valuet6vj q0 vxpb0543thei 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 0*(h o8a/ ah2 +bqlpfpa4mp -lojvro/a speed of 36.0 m/s. (use $g=10 \; m/s^2$, only fill in numerical value in the blank)
(a.) Calculate the time required for the ball to rise to its maximum height.  (数值)  $s$
(b.) Calculate the time for the ball to fall back to the height at which it was hit.  (数值)  $s$
(c.) Calculate the maximum height reached by the ball.  (数值)  $m$
(d.) Calculate the ball's speed 2 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 12 m above the point of contact between the bat and ball for the first time.  (数值)  $s$
(f.) Determine the time at which the ball pass a point 12.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1.0 s?xq /tbu(y b2d )n9kt4s

  In Fig. below, what is t+w,pz phxsg5l49eugn)(yd8b he velocity at t = 2.5 s?

  In Fig. below, what isrwp9g0 kbh 593ihvt0q the velocity at t = 4.0 s?

  In Fig. below, what is the velotw/ i vsr5x;7ocity at t = 5.5 s?

  In Fig. below, what is the ave2gc0m l7 *gjiy*h ,tzlrage velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 e.:/1 ehg6m m;hup8jqj -jtzc to 6.0 s?

  In Fig. below, what is the acceleration at 1.ar4 exo8; vgit;gw:: j5ywq :i0 s?

  In Fig. below, what is the acceleration at 3vlm9k58wy bl9o-eo+c .0 s?

  In Fig. below, what iecry0jt 0*o s8s the average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to i8ro5lxs4+0ks mobt j7 a,d; yge+m3l8.0 s?

  In Fig. below, what is the of)t 2o7/okcg displacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocin /;m* df;xlkq ocjz9q8pv5e+ty? {speed|velocity}

  An object can have a varying speed if its velocity is c3(qpl;0i8fpiexv 9 u.p1zv x lonstant.

  The velocity of an object can be negative when itsg l s:9oum,+ap acceleration is positive.

  If one object has a greater speed than a seqenz9n 3 key*ly5a0lct;7 wma z;v2h* cond object, the first must have a greater acceleyz5ahq; et0 7alw;* 29kn c3lv*meznyration.

  Two cars emerge side o3 ;olu,+d 8oassnjw,by side from a tunnel. 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 incr95k xj2vvt5bz hxd6p 4fmzu );easing in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves the bat wuj118g1j bspo:zvldkz x5 /m8 ith a speed ofjj 1 gz5pkmbuz88xdvls o :1/1 $120 \; km/h$. 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, whawck8jqafxx1 ao8)+*a t is happening to its acceleration, how does it change if air fricx)xa8c+jq 8 aa*f1 kowtion is ignored?

  As a freely falling object speeds up, what is happening to its accelen) u/+ bcaevj5ration, how does it change if air friction CAN NOT 5 +c /auenv)bj be ignored?

  An object that is thrown vetxxhmcy*pi .3(z4 tz9rtically upward will return to its original position with the same speed as it had initially if air resistance is negligible. Ifi t(3 xz4 *chp.xmytz9 air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at the same taat5jkq )1)u+b pei.-c fik1c ime.

  An object can have nonze5 qx 8qqjxey2+ro velocity and zero acceleration at the same time.

  An elevator moving from the second floor to the fif5)q cr+mt 7 p0wgpdl.sth floor making no stops along the way has zero acceleration allcp 5r7t+)pml.q0swgd the time.

  A rolling ball moves from g6. amz+jrp ht.1znw ;ksvi94$x_1=2.4 \mathrm{~cm}$ to $x_2=-6.1 \mathrm{~cm}$ during the time from $t_1=2.6 \mathrm{~s}$ to $t_2=5.1 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.0 \mathrm{~s}$ is at $x_1=2.1 \mathrm{~cm}$ and at $t_2=3.2 \mathrm{~s}$ is at $x_2=7.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps t0sh1dkx/ m3o around a quarter-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 strc 4w+afxa9oyzps .nuv+t/4y*4 la.gc aight line, moving 104 m away in 13.5 s. It then turns abruptly and gallops halfway back in 4.5 s.fx.z l+ yspavy9ocac u/*.tn44a4 g w+ 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 v-ory y* 4k627n catni$11 \; m/s$ 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 fropddc ; zwg,r:)m $15 \; m/s$ to rest in a distance of 60 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a spee x/8su2kh;xlk0zv94a7 jj :uo.klcp vd of $26 \; m/s$ 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 b 6j:tlpyzbmr5 )b :s1xlocks to essentially top speed about m)bbjp6y:zt5r1xls : $11.2 \; m/s$ in the first 13.2 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 unifor1low/cn5pd66 d a+z0i 6rgdwg mly from a speed of $18 \; m/s$ to rest in 5.87 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 -o54ygjwblmrsitu2;u- ljf 2h a b 65*on the highway. Assuming a deceleratj fwua4- t5 lu 56ghbo2 rb;l*2im-jysion of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going k) 6u wp5*cgrx$25 \; m/s$ 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).    $m$