Suppose that an object travels from one point in space to az(jjj 60iz4mq7w,i y1mbw u31kgc/eunother. Make a comparison between the displacement and the distancmj 1ekmcquiw74,w6gi 1ujy0( z /bzj 3e traveled.

  When is the average velocity of an cwn:r6g8-39 5ng q 6pkgmpovid 2 gi-u7u/pluobject equal to the instantaneous velocity?

  A new car manufacturer advertises that their car p x3pmvm+xvu5x*ow rl8r7/ 3o can go "from zero to sixty in 8 /u8r+mx5wxm r7 ovv p p*3xo3ls". This is a description of

  An object moving in the +x ak pz5oh a)rsvu- 9up8(xis 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 downo8j5s p 1yjvl:4qjnol; 3th4)ff w -gx as it approaches a traffic light. Make a statement concerf)x;g1lt3of4n8 plyqjo sv4j-j w:h 5ning its acceleration.

  Suppose that a car traveling to the West (-x direction) bw9a 8jhr. c9k g42qgn lsq4 sg9e85oxuegins to slow down as it gg8q 2c.9j4gshs5a8xrlow q9 9ne4kuapproaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving md)f+h0y0) w)ecsq:v xrad;f y9f ( cswith a constant velocity. Make a statement concerning its accelewc0f + 9dr yeha()dsmqcf y:0xs;v)f) ration.

  If the velocity of an object is zero, does it mamtdx*2ui , +kean that the acceleration is zero? Supki+u ,2t da*mxport your answer with an example.

  Can an object's velocity change direction when its acc:kwpe3yxktakv. -. i)n jy)vl3 a4e.celeration is constant? Support y) .y34nxeacykp3:jkve-i wvl a )k..tour answer with an example.

  Suppose that an object is moving with constat+t*z 7qj:f,zpc 6t *h:bt qfynt acceleration. Make a statement con7+ tfqfttz,bh*6y*q:z pjc: tcerning its motion with respect to time.

  Can an object have increasing 3h2l.h samqvg 14evc) speed while its acceleration is decreasing? Support your answer with an exa g2maehqv3h vc4 s.l1)mple.

  Suppose a can, after an inima3/ vke vd1 9y:t0 mw5mfwt(ttial kick, moves up along a smooth hill of ice. Make a statement vm3:ma twy0et9t51( m/kv f dwconcerning its acceleration.

  Under what condition is average velocito4 5j vrxfz:4vvsqj t5h13 2eyy equal to the average of the object's inity4zvx5s qf4t25jvo3e vrj1:h ial and final velocity?

  Objects A and B both start at resl et)6 *snpdn-t. They both accelerate 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 td* e6l-tnpns)hat of object B?

  Objects A and B both start from restk*j a 3 x,o(s0xqg;sgz. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What qsgj*g;3,z0 xxok( s ais the distance traveled by object A compared to that of object B?

  When an object is released from restk-r2h7u 4 pes le5lwu+ and falls in the absence of friction, which of the following i2krl- h7p+ulu e4wes5s true concerning its motion?

  When an object is released from rest and falls in the absence of frictoev*/3t kzep 2ii:o k3ion, which of the foll*zik:po oei e32/3t vkowing is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocity h/ca)5ey-;axs c 0qefj+.ubr and the acceleration when the ball reaches the highest poinqya;juece.+f -arhbs/ x 0c)5t.

  Suppose a ball is thrown straightv2w d,o44j p7b/ikylk-5tp zf up. What is its acceleration just before it reachkpd k/ 4ft,v2wo7 l4pzbi5jy- es its highest point?

  Suppose a ball is thrown straight up, reaches a maximum height wuok8zhwkwdd7alk0 )l0d2+- , then falls to its initial heigh+wza )-h20wkl 8lodw0ddk7ukt. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maxikbbw*wdf3t kkge bp y;;48,w/mum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is comi/4;kf3bbbk k;p tg wd8*,yewwng down.

  Suppose a ball is thrown downward in the tm8+ngi6t yy/kx3orf1t+s c 6absence of air resistance. Make a statement c+st/k1fo 6 n8c3 rymg+xtyti6oncerning its acceleration.

  Suppose a skydiver jump-cx a( 0ch5rd x:et8rvs from a high-flying plane. What is her acceleration when she she reach:v 5- cd(ahrxext r8c0es terminal velocity?

  A ball is thrown vertically upward with a speed v. An ident moeh2e,m14(w ohek47(3yyk lbav -sjical second ball 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 fir(ee2jk7solh4b e3vamk w-y41h yo (m,st ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. Onbz71airuap9 3e second later, ball B is dropped from the same building9baa3 ruzpi17 . As time progresses, the distance between them

  Ball A is dropped from the top of a building. )r4+ jdg3 df3gmnh7be One second later, ball B is dropped from the same building. As time progresseshjbd4+3re7g3n m gd) f, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thro/ c1/46ikc g r(battkvwn up, and the other is thrown down, both with the same initial t c/ta4bvr1c 6/kk(ig speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A sef2k4bpat 7uxh-;wv ,r cond brick is thrown straight down from the same bui, va42k-hf 7bp;uxr twlding. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with co,nz xqpy8 h 9acfpstsj )9z;c2q:y*,znstant non-zero velocity in the +x axis. The position versus time 9;yyn)zq pca:ss zz*h29jcxq8pt, f,graph of this object is

  An object is moving with constakr8uusg0fx daae4,.2nt non-zero acceleration in the +x axis. The position versus time graph of this ob ,k8a .gu4 2xf0sedaruject is

  An object is moving with constant s .6 l)gm9z4y9fpuhupnon-zero velocity in the +x axis. The velocity versus time graph of this obu4lh 6 sm9fz9)gu .yppject is

  An object is moving with constant non-zero acceleration in the +xp/z,8vlzac u xj*x 7y-lk3r+qeir .0k axis. The velocity versus time -,kxlaulcrzqk+0z/ 3v ej p.xr iy*87graph of this object is

  The slope of a position versus k0rp+50p:yhnp/rsql time graph gives

  The slope of a velocity versus tiyo, khx6k0z9m80z inime graph gives

  The area under a curve ;yf ip7a/ n-*dzctj6 zin an acceleration versus time graph gives

  The area under a curve in a velocity versus time grapl* er*9n-ztsg tm1.wwh gives

  If the position versus time graph of an object is a horizontal line, the nhi2bw,wa-j5nwddo4hyy,2zj9 s- g9 object in-9,y ,h-9 yjwazgnshd2 24 5obji dwws

  If the position versus time g-phu8cg6s* 7brwnzw73pu mc sq )t igz 9-bx*/raph of an object is a vertical line, the object isupgcnwq - bb*7c su/w7t-grzph*8i x36z9sm)

  If the velocity versus time graph of an object is a horizontal line, the ob*kipdzpry;t0;9 8zkwep* pc9ject z9 ;i9 z0kykep8r*;ptpp d* wcis

  If the velocity versus/f6 qghdva *k3 time graph of an object is a straight line making an angle of 30 de3 qhag6fd/vk*grees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both thedre0 ae x-ql-ccisq -p5k72m2 distance traveled and the magnitude of the displacement vector.5ai k rqclc--s 20xed 7-p2mqe

  A boat can move at 30 km/h in still water.bz+pvc8(:t* 3 m8, fu-z3b9qzjk qjb 8rx asdy How long will it take to move 12 km upstream in a riverv+jtz8(j:q b,z3 9p*x8bk-r bcsqu3 y8 zfadm flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 m)u mvempd7yl3 *pz--g/

  What must be your average speed in order to travel 350 km in 9v- ik+twyzs .zz:-dl5.15 h?

  A runner ran the marathon (approximately 42.0 km)jy) c0fb oyzb6( k qi5s46lwf+43lxr p in 2 hours and 57 min. What is the average speed of thel +s0wx if bzk64)l3b frc45y6(p qojy runner in m/s?

  A car travels 90 km/h. How long does it take for it to trav:uq8gaxl;, onel 400 km?

  A ly (light year) is the distance that light travels in oy.))oiat gu3i yv.kp4ne year. The speed of lg3a . v upi)4tyki)o.yight 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 72gwzc*e/jw s i-.in31k km/h along a straight road and you look to the side for 4.0 s, hjw.31*ni ks-i/ wgzce ow far do you travel during this inattentive period?

  If you run a complete loop around an outdoor track (y07 /,0fzqw,d*frizlui0 z 8jojk57ra tq 9km400 m), in 100 s, your average velociwtf7rlzmj f,08k0*kziqd zoau5q j/r7 9y,i0ty is

  A polar bear starts at the Nu28f 7 ieksgy2orth 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 startg27eku8 2syifing point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. bt vl)tri 1)r,It travels 1.0 km south, then 1.0 km east, then 1.0 kmtrvl1r) ,)it b north, then 1.0 km west 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 school at 55 mi/h for 110 miles. It thj 1.f+xfpfe+5 kulm;m ztm w (1rns6/een starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hop n1 5rek.m/zew(fsu l1+mtf6 ;mjxf+metown from school?

  A motorist travels 160yvr/y: f7g/ 0d* mflrew 1duw a2om3b; km at 80 km/h and 160 km at 100 km/h. What is the average speed of the motorisdwf /wo*mvma 01 r372rye f ugb:ly/d;t for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at j9kthx5 z;v5 0 m(dh,g.usqz4k:v osa100 km/h. What is her average spus;z.x9zkjk4o5h 5a tv sq mg(d v,0h:eed for the trip?

  An airplane travels at 3hhobcsl8y1u s 8 s +ns:ex,(l500 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed s ys ,lhso(8 s 1bh5:e8n+ucxlfor the trip?

  In a 400-m relay race the anchorman (the person who runs the lv*-;qtx1 hyq tast 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 finalqyh-q;vx t t1* 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 11 s. The car'o s)*7 cpgd-wcs average velocity during deceleration was 73 km/h. What was the car's deceleration while slowopcc)7wg-*s ding down?

  An airplane increases its speed3q.to :yayf pllnm*5- from 100 m/s to 160 m/s, at the average rate of l 3ao*yptmn5f-l . q:y$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate of k0*0 t7balrxh yy .dssc6a.m+$2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from re6hieg -+eihiy1w eyj5zt/;g:5 awxnj g 71in2 st 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 m/s fos +*b+obpm um3r 10 s. It then speeds up with a constant acceleration of b b +po+3mu*ms$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 1.7 /a6o-fpxac( fm/s experiences a constant acceleration ofo/f ( apx-6caf $4.8 \; m/s^2$. What is the cart's displacement during the first 9.1 s of its motion?

  A bullet moving horizontally to the right (+x dilfd iq xkz;ihc9a177c7-z ) zarection) with a speed of 430 m/s strikes a sandbag and penetrates a distance of 91zl7-c7 ai9)fq1x kd;izzc ha7.35 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. Iycngq **lrvc, 9 *a) u4ob;znzt reaches a speed of 42 m/s at the end of t*zc) ;uy aovng4,9rn*zclq b*he catapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rg,ka qlpfk;i wp 9m:e18t0c7 dest 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 a. 2(f kb 6ulu wdgu0kxt.*:urm/s in a distance of 200 m. What is its average acceleration?xu 2b .uf0 :u(u alkg6rw.tdk*

  An object starts from rest and undergoes uniform accelqe6i j9h ahc3vj- 2r)oeration. During the first 6)3hijq9 vhr j 2-ecoasecond it travels 9.8 m. How far will it travel during the third second?

  An object is moving in a straight line with constant acceleratio1pmqay 0ufm ,6n. Initially it is traveling at 16 m/s. Three m6mfa 10qu ,pyseconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniformlop xl2yw3b6 lo3 -j;yiy 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 cgt,s /kkfad)0an 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, alb+*rl,q1q ov car that has been waiting at the intersection svo* b qlr1,ql+tarts 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;vx0jq 2elk t0 m/s on the surface of planet X where the acceler0tkqv2e; 0j lxation 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*h)dh wm8 areim wydgn),*/k u6hb6k2 12 m/s on the surface of planet X where the acceleration due to gravity iae/ gb*yh *m,6mhiw ku8dr 6d2w))hnks $1.5 \; m/s^2$. 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 planvdm+hz lsx/ r8r88r r4et X where the acceleration due to8v4 sx l+rm8/h8zdrrr 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 on the surface nw/s3pkv- wi9of planet X where the acceler nwvpw- 9/3iskation 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 d cet+ j4oe66qruler between your fingers ated+ 6qoe6c4 jnd releases it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What i+ ynpzyp6o0m cqlr z0w16an;,s its velocity after 3.00 s?pzr 6,l0nnz yo;+q16yamp w c0

  A bullet shot straight up returns to its starting point in 13 s. What is the i-uc(.k x-j*tz 0 qldy5vov6hknitial spe(- 0jv *uy-l5.dxk 6okzhtqvced of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How lon:*uuetg hzc(: g does it take to returc (huzte: :u*gn to its starting point?

  A ball is thrown downward from the top of a building with an y6ni ;ii 3 lhfne/,u;winitial speed of 29 m/s. It strikes the ground after h3nnfi,;u le6i;wyi / 5.4 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numerical valkt f 82x:pu*rg9obl7 xue in the bo fb:lkxu r2t7xg9p*8lanks)
(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 straighkg hzzk+-93 ywt up into the air with a speed of 27.4 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 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 velo:lo7 w8lhpmb0 city at t = 1.0 s?

  In Fig. below, what is the velocity at t =isw151v q:z.a b: jvbu 2.5 s?

  In Fig. below, what is ths uesw(0e 1(a,t5 zhgpe velocity at t = 4.0 s?

  In Fig. below, what is the velocity at h7jvx0w 5ee: at = 5.5 s?

  In Fig. below, what is the average v+bia9mhgf,3f/axd) w )xk o 8yelocity from 0 to 4.0 s?

  In Fig. below, what is the 7y:l2 vieq4x taverage velocity from 0 to 6.0 s?

  In Fig. below, what is the accelera q php:ns7hiiqr;cu8n14 /r w-tion at 1.0 s?

  In Fig. below, what is the acceleration at 3vw ff .b;tn-3::shehqu wf8z5.0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0f2v+( opn8 kt*p )cssv1i)hi h s?

  In Fig. below, what is the average acceleration from 0 to 8.i p3i;,c ,cr u03ypvhu0 s?

  In Fig. below, what is the displacea/*)m:1ewm2t6lgz uh7l x g ctment from 0 to 8.0 s?

Does a car speedometer measure sw*k,.cz fals, 5+5d/ sw l5bmaa0ihujpeed, velocity? {speed|velocity}

  An object can have a varying speed if its gn.yk35m q+9g 8dl5d: qbpsw,rnb x x+velocity is constant.

  The velocity of an object can be negv v9x7wrgdgdcf0:hf1 8 *+nvs ative when its acceleration is positive.

  If one object has a greater speed than a second obj6p(ng izogr :3ect, the first must have a greater accelgi3:p(g r6onzeration.

  Two cars emerge side4pv/d c0ux, rq 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 increasing in speed as its acceleration de0kjgqx a; +: 2q6vn jhrtk..wq+u-xrbl;w;s rcreases.

  A baseball player hits a foul ball straigepa70 y r1 ih1vtk+-/n dl(mme j8fho+ht up into the air. It leaves the bat with a spe-+/rpj+ 1 dy 0ke7vfh(8mnh a1oi mlteed 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 oww0 wlwl1 l-6nbject speeds up, what is happening to its acceleration, how does it change if air fric6 wwlwnw-0l l1tion is ignored?

  As a freely falling objecty h r.c8hbw /.f6ctc;u speeds up, what is happening to its acceleration, how does it change if air friction CAN Nchrubwc. / hcf;68ty .OT be ignored?

  An object that is thrown;y 9z9j lnuchw44f kv, 7ij0g8-jhpjq vertically upward will return to its original position with the same speed fy7 c,p48-zv4q9j 9hku hj; gj0inljwas it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero vela6hr sj0kv8yhjbi8 2(ocity and nonzero acceleration at the same time.

  An object can have nonzero velocity anddy0.qqacfut/2d4mx 2 zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor ts04+ 9xnp w(ixc9z ypmaking no stops along the way has zero acceler9(9sy+ p xp 04wczintxation all the time.

  A rolling ball movesdtr 9 2/.yrlqy from $x_1=2.1 \mathrm{~cm}$ to $x_2=-6.0 \mathrm{~cm}$ during the time from $t_1=2.9 \mathrm{~s}$ to $t_2=5.2 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.4 \mathrm{~s}$ is at $x_1=2.9 \mathrm{~cm}$ and at $t_2=4.1 \mathrm{~s}$ is at $x_2=7.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around aqzfq7 t3bve-j.a s,5 p quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 10.6 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trainer k/6s6/h m.hcc6cf edd in a straight line, moving 109 m away in 12.3 s. It then turne6ccm ddhs6/.hkfc6 / s abruptly and gallops halfway back in 4.5 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 fro :/.rsxt dtzp;m $11 \; m/s$ to $24 \; m/s$ in 4.3 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 frojs:ez; 65dyv uec.o m)m $17 \; m/s$ to rest in a distance of 62 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reacz2s+l -vwj(snh a speed of $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.3 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can p20n+)o,p1:upeym xq b2 hzv rburst out of the blocks to essentially top speed aboutu )qo+v,0pnxe: 2pp 1bmzry 2h $11.3 \; m/s$ in the first 14.7 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 ,dnu-gwsd j pknx6/v (+,wec1speed of $20 \; m/s$ to rest in 5.07 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 higjwi u,;slig92hhxt/a /qc3q*hway. Assuming a a9qg j / 2i*sh;xqw,/cuth3 ildeceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truccvrzmf sa-ndd2w 8yi; e: 42s*k 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 10vk ua)9m m72vo,000-m run in less than 30.0 min. After exactly 27.0 min, there m)7am9uvov k2 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?    $s$