Suppose that an object 3ij6xgbkyl nkiqs78 r2-.;xx travels from one point in space to another. Make a comparison between the displack7 x s.2 nb- irxix683kgj;ylqement and the distance traveled.

  When is the average velocity of an6kk)y4-ha b4ocpvff,14dsz w object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go lw(au 2, .af,juz4pjv wxzy .6"from zero to sixty in 8 s". Th6wp4f .u jzxy (lz2j,wau a,v.is is a description of

  An object moving in the +x axis+tr 8iu0ykw0nvn,4q:v j)tmk kqg/-y experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveli*, ik1ml 9+cbizx1fy yng to the East (+x direction) begins to slow down as it approaches a traffic light. Make a cf1mb i+1xz* i lk9yy,statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slowk 4s2edvgr:-yz.p *ek down as it approaches a traffic light. Make a p2edkky -.4zr*s: gve statement concerning its acceleration.

  Suppose that an object is mosu5s pj3e8u 1if7ml hx8t(n56xve/ noving with a constant velocity. Make a statement concerning its acceleratiovs35(uju7n/6pmeh 8s5tnl ixo e fx18 n.

  If the velocity of an object is zero, does it mean tha-.g vb. w 9lde-cfg9mv ,kqq:st the acceleration is zero? Suppbcv-g. qgv-m: esq w9,9d.kflort your answer with an example.

  Can an object's velocity change direction when its a00rf- -fliugai1i a9gl-j sd5cceleration is constant? Support0i gllr-i-is 5a d0jf-f9ug 1a your answer with an example.

  Suppose that an object is moving with constant acceleratiov93e fdg ao*r0ymit45n. Make a statement concerning its mofv a 0yod5etm94g3*ir tion with respect to time.

  Can an object have increasing speed while its acceleration is dec11.1so qrdmet reasing? Support your answer with an exd1qets1.1 mr oample.

  Suppose a can, after an a4 ;wed 1va e*hqd5 w7y)fkwq7initial kick, moves up along a smooth hill of ice. Make a statement concerning i74aq1e d w;ywefh57w*k dv qa)ts acceleration.

  Under what condition is average velocity equal to the average of x73+hez3ukyn the object's ini un3kyx+ ze37htial and final velocity?

  Objects A and B both start 8* bqlgf 5 np50+u.llcak +3ky6(j dhwoqi6qx at rest. They both accelerate at the same rate. However, object A acceler5 6qlblg.f jqpudn 5 6kx 3*8(qkio0a++lycwh ates for twice the time as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both start u5./kwxmh o3bfrom rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by oubhwmkox./5 3bject A compared to that of object B?

  When an object is released from rest and falls in the absence of friction, whic 9rx n):hj:f qs6oq((ugvm.rsh of the following is ovrns. (::j gfs)6qhm9 uxq r(true concerning its motion?

  When an object is released from res.m)ocpva,u 7y:v5i iby4; hukt and falls in the absence of friction, which of the following is true concern4kpv iy,cvu ):mibuoa .h;y75ing its motion?

  Suppose a ball is thrown straight up. Make a statement about e7yp4 rso0it, qv3x1ri kir/) the velocity and the acceleration when the ball reaches the highest1vo yriiq07 3i/4)ter krxs, p point.

  Suppose a ball is thrown str(/ 9l stgm2o iy2hojf*9t 1nekaight up. What is its acceleration just before it rt2yh *oslni9gto f9/2(jmk1 eeaches its highest point?

  Suppose a ball is thrown straight up, reaches a maximum height, then39lo, 92kbeb:ouyfrnywgbb x f-3 8s0 falls to its initial height. Make a statement about the direction of the vo 3bbkeu 89o:b ygb3,l 0x-frs29wn fyelocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a, c5lwlo u+x4t maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the u5lo ,t+wl4cx ball is coming down.

  Suppose a ball is thhoacihg :e;k +m w,8a+rown downward in the absence of air resistance. Make a statement concerning+i+:ackhm ;eg,8wa oh its acceleration.

  Suppose a skydiver jumps from m3/n2zdh lqj4 :c(y4 ad; xbzpa high-flying plane. What is her acceleration when she she reachesb 4d ypx3mcanq2:hdjz/z;(l 4 terminal velocity?

  A ball is thrown vertically upward with a speed v. An idvi 83olp**in /t4f)to twat:dentical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the secondit* tp3*:fdw )oio 8v4atln t/ 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 second later, ball:77g2ze5gmu/ ns l z82hipbp z B is dropped from the same building. As time progresses, the distance betweesp5b 2 l:/gphge8 n72z7umzzin them

  Ball A is dropped from the top of a building. One second later, ball B s2 xg9vu 25u wf7mpd: sppsw4*rx91n yis dropped from the same building. As time progresses, the difference in their speunvw42p5:pup29gf*1s 79dswsy mr x xeds

  Two objects are thrown from the top 3+ heo cva: u5hcq*p,vof a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are t3v c5e*op +ahcq,uvh: heir speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is thr,z /,vb6xdyt yown straight down from the same building. They are released at the same time. Neglev,d,x6/t byz yct air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zertn1. s 0fn k-3jkabiu+o velocity in the +x axis. The position versus time graph of thi+j1 fk-03 nibsu n.kats object is

  An object is moving with constih06ira lcz d26v o/6xant non-zero acceleration in the +x axis. The position versus time graph of this objexoli azhc662/ri v 0d6ct is

  An object is moving with constant non-.. vp2v+einzk5kfia axr8 ( (azero velocity in the +x axis. The velocity versus timevf+aei5v.zaxar i(2 ( .pkk8n graph of this object is

  An object is moving with constantydclf:;.j:e k (* pzwfq8f /eope5ll6 non-zero acceleration in the +x axis. The velocity versus time graph of this ol f/8okzwpp(*fde5ee; y.:6f:lcq jlbject is

  The slope of a position versus8 qc)tp22k wq0yo8ekv time graph gives

  The slope of a velocity v18jhj:u3w)vcpibai7a/ f m 5nersus time graph gives

  The area under a curve in an acceleration versus time 5hccgxy k6a ip+ j1- ko)j4fw;nkpyr(0b: t.lgraph gives

  The area under a curve in a vm)rpbqzf.l,om+2j v /elocity versus time graph gives

  If the position versus time graph of an object is a horizontal li fo.g(v rxai9g7ljd8 vya2;/j2c7jyvne, the object ia l(8c2jy/x;fj v.gvv 77o9 jadgir2ys

  If the position versus time graph of an object is a ver.:.e wcr9mj4-smx n irtical line, the object is-sxr:n cim 49..rmewj

  If the velocity versus time graph of an object is a hobt-amh+ ay bvc)l17t) rizontal line, the object a)y 1h) ct bb7t+-mlavis

  If the velocity versus time graph of an object is a st(ml6* -jx1 o3fdpebrkraight line making an angle of 30 degrees witpmr1dl3 e *fjxk6(o-bh the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both tdxyanp bupm.: -w9o* 9he distance traveled and the magnitude of the displ 9*xyp.-no :w dpabum9acement vector.

  A boat can move at 30 km/h in still water. How long will it tkgo4 ,,v(dpc aake to move 12 km upstre(gakv4 cp,,odam in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = dfu,ziz)0dab uo * fy2.zeg+21609 m)

  What must be your averagepmofbc0 16q d+z xs.pt4*q rv9 speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 5aa6lue uqk/pnsg91)w.w. *eh 7 min. What is the averag)eu/aks1u. qwnwaph 6 9.gel*e speed of the runner in m/s?

  A car travels 90 km/h. Howqd6 f)r/f rukie02h0rrf my1 7 long does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one ykwvr) itkc rib4w, is)+(2n1year. The speed of light is w2iw,kcb( i)ryst r1ik+) n4v $3.00 \times 10^8 \; m/s$. 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 chir )s/ii1 f2to the side for 4.0 s, how far do you travel during this inattentive perih cf2ii /1s)riod?

  If you run a complete loop a,5qsr : 5/)qkk1 8 hqsiiuwyiqround an outdoor track (400 m), in 100 s, your average velocity is ikh 5syqkw:qs )rq15q, u8i/i

  A polar bear starts at the North Pog /9jze o50gyble. 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. Whatyegg0/5oz9b j was the bear's average speed?

  A polar bear starts at the North Poleq7ko ydhuv0h)ok bj:3nu,a41. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west tobu k4, yhh1o) voduka:073qjn 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/z6b/.adf 0qu zh 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. How far iab uz /q.z0d6fs your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 c97w/y +p 1xwr3kutxh km/h. What is the average/hxrwc9+w y1k3 tx 7pu speed of 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 is he/uz)ffs pj07kr average speed for the trip kspzf)fuj 0/7?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north )g;zf,yb72 mf*tyfsj mlgq 14l7/tigfor 750 miles. What is the average spy7/yllzs*) 4bt mgf 7 j1 ;mgti,gf2fqeed for the trip?

  In a 400-m relay race the anchorman 2w mttz x*) gw;kap5bq ya 6/zps+6j8vd3 yrk-(the person who runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the mpjtw a vr26 xd/5zq;skwyag +z)yb 36-*tpk8 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 order that the team A runner not lose the race?

  A car decelerates uniformly anb4 a :zumijs:1d comes to a stop after 8 s. The car's average velocity during deceleration was 3: as 1mib4:zuj5 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average rate of m*li 27 ,hf*p cb2tnkxlj98 zbblm2tj,z fcn289 lpi*bx*h7k$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at jt )bho;;yll 17 i5c-*xvlmel 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 and accelerates ay27eg8sqe ep:hz *5t8zvvv j -t $4.0 \; m/s^2$ 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 with a n5 p.iosll9 m7constant acceleration of.7p 9n l5oimsl $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity o*lqu lmfszh 1e/:t;7p f 4.1 m/s experiences a constant acceleration of : etlu1lq/zp*m s7f;h $4.2 \; m/s^2$. What is the cart's displacement during the first 8.6 s of its motion?

  A bullet moving horizontally to the right (+x directivx),qxx0.-wvl tf hh 8+8f+q-ygda naon) with a speed of 201 m/s strikes a sandbag and dlt++qy aa n-0gvf,x qh8fw-).x x8vh penetrates a distance of 50.31 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 ,e0 6b8tc7o +usz,f tt;igo:qc .ntsk carrier. It reaches a speed of 42 m/s at the end of the cataks e7b;tuf:oo g0.,sc +,z tqt6tinc8 pult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with consovfbyd 3)w m)9tant 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 m6d.cqr*ygv m(ynr t)2 /s to 80 m/s in a distance of 200 m. What is its average acceleration?qdyy n( vct2 .*rr)m6g

  An object starts from rest and undergoes uniform acceleration. During the first p, *+dus;j60 vg/awz qe5fkpt second it travels 9.4 m. How far will it tra , fpv+;t*d/q weupgjs56az0kvel during the third second?

  An object is moving in a straight line with ,- +itfh9b x wp.h4 5hrlm5y3kh gu0yeconstant acceleration. Initially it is travele4hh5ipmyf3u wb hg l0 y.5k, 9r+t-hxing at 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 accelerav q8u q;.qi8zstes 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 deceleve8 h 72+ngbtdj.t; hgrate 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, )dat9pe )v uxm9kt6:la car that has been waiting at the intersection starts ahead with a constant acc )v 9 laxpm6u):ttedk9eleration 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 upwaun(hfu /oahyucyvs99 ) /ut34rd with a speed of 12 m/s on the surface of planet X where the acceleration due to gravity i vnau t4ocsy9) (u9/fuh/uyh3s $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upw d8r6axzek;tq p9e;m;ard with a speed of 12 m/s on the surface of planet X where the acceleration dudpz8 etxak96e;r m q;;e 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 surfacezy(5i k60o,5 k 0f/zplhxpzin of planet X where the acceleratiz hkx5p(0iyf, zpzkn0o l/5 i6on 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 on the surface of planet X w(l8y1dg 3vby9rwn 1v qhere the acceler vyg( q91 3n81wyrbdvlation 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 friendd9i pqh(nvz s-8:l:bs holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you catch :s b vndshq9pz :l(8i-it?

  A ball is thrown upward at a velocity of 19.6 m/s. Whax sb/c6h0d8( nnj5vlpt is its velocity after 3.00 s? n5lbx(dch60 8/np jsv

  A bullet shot straight up returns to its starti-ya*-er sxiz : dvh 9bv/sg4g*ng point in 10 s. What is the initial*i s: -yxvzs-/h*gabg4rve d9 speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it te9n)psh6i5j 6ngxp w27cfeq)8 fn pf3 ake to return to itsf )w25sxnp nf86 pcq6e9hep7)j3fng i starting point?

  A ball is thrown dowdqg ye2-01vtvz7cj 2mnward from the top of a building with an initial speed of 29 m/s.7y -2zed vg mj10qcvt2 It strikes the ground after 7.8 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill wsm gvs-k8ns9s2/( ic in numerical value in tscs sg8 2-kw9ni/s(m vhe 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 straig6r5hy.d3jr0 o9o pjj zht up into the air with a speed of 24.4 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 14 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 14.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t qd 9vpgy)4jc .(*7t rexqt,rt = 1.0 s?

  In Fig. below, what is thew r 5a2:wsd7hc velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t r ,v .nuozh+c7 0r0gwb= 4.0 s?

  In Fig. below, what is the velocity at t = 5ajr 4j/tns7)si9o *dg.5 s?

  In Fig. below, what is w5ku1q wu54jothe average velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0g(e w:j77rm eavb3 v6,j*kb hk to 6.0 s?

  In Fig. below, what is the acceleration at /- 1.oij i+gm2qxtow4x1uvs r1.0 s?

  In Fig. below, what is to0p5ud4 ca 1lmhe acceleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0kz0lg- d:xmw;dg/ jw,8 uk( of s?

  In Fig. below, what is the average acceleration from 0 to ( l 2 cuw2llolsz,y6 /y+1kgee8.0 s?

  In Fig. below, what j7rt ,,ev uvw84z m1jais the displacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|velocity}khdp (*kjl 17b

  An object can have a varying speed if its velocity is hl sosm3kx904 wu-5, f8kzvwo constant.

  The velocity of an object can be negative when its acceleratio,zlhzc4 xb)6mwf r8;+zzf-tkn is positive.

  If one object has a great13e:pvgnvt:-k1u ei i er speed than a second object, the first must have a greater acce1p3ii- evt:1e:gkvn u leration.

  Two cars emerge side by side fa(61kjd0.: y0pil/j 8h.hue twlt oyhrom 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 sper v7lg 0;w/,p0 gorjssed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the a2gz5m87ou vjqze8w( .x1qtukir. It leaves the bat wit8k2jze.wg185 (t xuzoqm 7 qvuh 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 objevf uz s u3yxv58:ijm6+ct speeds up, what is happening to its acceleration, how does it change 5u: j38+yf 6xzvs vumiif air friction is ignored?

  As a freely falling object speeds uyv;x8*tfu p7b p, what is happening to its acceleration, how does it change if air friction CAN NOTy8f; vp tb7ux* be ignored?

  An object that is thrown verpvjf2 v ;z c1p3(y56a gxqfyt0tically upward will return to its original position with the same speed as iv;26pf3 ygq0cf1a( zpyx vtj 5t had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzerw)sh v9i jkc zq.f,7)eo acceleration at the same time.

  An object can have nonzero velocity and zero accel.11yc 18cm gtoh u2hfberation at the same time.

  An elevator moving from th6k m-/9tzsl.m e nl1rie second floor to the fifth floor making no stops along the w/. rtl -691miznmse lkay has zero acceleration all the time.

  A rolling ball moves 6mm8v;koyy ),xc,c47cw;ob nfsvzq0.a6ap rfrom $x_1=3.4 \mathrm{~cm}$ to $x_2=-5.9 \mathrm{~cm}$ during the time from $t_1=1.2 \mathrm{~s}$ to $t_2=5.8 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.6 \mathrm{~s}$ is at $x_1=2.5 \mathrm{~cm}$ and at $t_2=4.2 \mathrm{~s}$ is at $x_2=7.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a +h.zxjbj 157fo0pf wqee0-cj quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 9.7 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, m0.k(kcz x9lkrit78 h goving 102 m away in 10.8 s. It(xikk l hkt7gc.9zr08 then turns abruptly and gallops 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 2t0u2-wvvozkgab h 5q,6u+ wf$12 \; m/s$ to $23 \; m/s$ in 5.8 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 froaf*;41 h t,asz*zr+w2tm daki m $22 \; m/s$ 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 speed oq*e2es , euo2hf $25 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.9 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top speedp3(0w g63omp p9lozk u about3zlopu p6k09 m(3pgow $10.8 \; m/s$ in the first 14.0 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 of x4asmy3u: o+f $15 \; m/s$ to rest in 5.57 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 highway. Assuming g+cx 05 igjt6x5+6gxigj 0cxta deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goingr0f6tbm n- z-s,d*) l+ojxl4 c/ilmfc $25 \; m/s$ 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 30.0 min. After c zvah lbg*5s/b7sv(5r*v,hhsqj 2 o9exactly sh,cq5 h*o2 h lr/7avgjbs9zbvs*v (527.0 min, there 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?    $s$