Suppose that an object travels f b2; slf-aiev.r+ lrp0rom one point in space to another. Make a comparib a0rs.;-pfi+l 2e lrvson between the displacement and the distance traveled.

  When is the average velocity of an object equal to thzerbbhfaw3jp) 2 i)yu sw-rmeb)em10 5l 568 xe instantaneous velocity?

  A new car manufacturer advertises that t a5ptp h(68t8hnbzn*x heir car can go "from zero to sixty in 8 s". This is a descrhttn p5x( 6nphz 8ab*8iption of

  An object moving in the +x axis expergq,fmwlf-;atphf+ 01 iences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling tocmue:up 8v*/3wddvs -j d pr59 the East (+x direction) begins to slow down as it approaches a traffic light. Make a st/9pmwuvdv3cup5d-ed s*j :r8atement concerning its acceleration.

  Suppose that a car traveling to the West (-xk)xd5 syt;m 1a direction) begins to slow down as i 15sxy;tamd)k t approaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object i- nof2t 1;oa )hvrw9eus moving with a constant velocity. Make a statement concerning its accele er)1no;uo2tf hw-9 varation.

  If the velocity of an object is zero, does it mean that the accelerationoe(s70w6 .gef5m 1cdcn bui4-,pqfpg is zero? Support your answer with an examplp0ccs7puem4i1gf q w(5,onf.-6eg d be.

  Can an object's velocity change direction wh(x mrkjwy8 v 3r1,f)fyen its acceleration is constant? Support your answer with an exampleyx8 (rw 3 j,rymfkf)v1.

  Suppose that an object is moving with constant acceleration. Make a statement 7 fio9s,m)3 m cftd* u5vdc94b-gdslo concerning 9s4v9dc mli d-to7 smu)b gfdc5o3*,fits motion with respect to time.

  Can an object have increasing speed while its acceleration is decreasing?e : yg-izdn 4xd)bv9*f Support your answer with an examp *:iyfnedb4g 9zvd-) xle.

  Suppose a can, after an initial kick, moves up along a smraya/o .9 cg9 *v*idlwooth hill of ice. Make a statem.ra*ywvdi/*lo g a9c9ent concerning its acceleration.

  Under what condition is average velocity eqmu6,y) xz(nm qual to the average of the object's initial anm)uy,(6 q xznmd final velocity?

  Objects A and B both start at rest. They both accebp*yf/xrc ltb07 ojv :f-;tl7 lerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of obj v rpy 0/fl*7b7ltfcb;:xt -joect A compared to that of object B?

  Objects A and B both start from rest. Thgm :i *b6xlyl 3q03bzf4kc s*zey both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance3sbbi:gcf*4 0mz qz* kly 36xl traveled by object A compared to that of object B?

  When an object is released from rest and falls in the absenrwz7*4oq +8eue02tcic 3s isqce of friction, which of the following is true concerning its mo2 c *ers7iqtw4u8z ois 0+cq3etion?

  When an object is released from rest and falls in the absence of friction, whz d1:j94prez3k /sdve e:ku :hich of the follow/4jse vd :dpe9 k zzekuh::1r3ing is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about;jvzn2 9ngc/u the velocity and the acceleration when the ball reaches the highest point. ;njz/nvgcu 29

  Suppose a ball is thrown straight up. What is its acceleration just beforp 8kni* .iyq9se it reaches its highest .isqpyik9 *n8point?

  Suppose a ball is thrown straight up, reaches a maximum height, the- 2e-:c)zevzgw f(sk an falls to its initial height. Make a statement about the direction of the velocityka 2efz(-sc-z )egwv: and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum hebbw 6 .t8ypenqk s8zbx 0a(.x2w5aal 4ight, then falls to its initial height. Make a statement abouw2b5aas.8b qa(80 xl6b.n4tpewyzkxt the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown doj f b39,ip7nz +tiugi-wnward in the absence of air resistance. Make a statemeg7j,9t bf zpn-+iuii3nt concerning its acceleration.

  Suppose a skydiver jumps from a high-flying pl9vn hxn0yc- wny+ d7m 9obb.d4ane. What is her acceleration when she she reah09.cn9n xbv7 d+w-y m4nyo dbches terminal velocity?

  A ball is thrown vertically upward with a s9g7zyk:a(khep oawt /cd : k45peed v. An identical second ball is thrown upward with a speed 2v (twice kpghe74 oz:/cd( a5a9kyk :twas 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 of a building. a w r,w e-y5nl 37rii0dcm(rn:One second later, ball B is dropped from the same building. As time progress 3 iwrda c-5:70r mlnyier,w(nes, the distance between them

  Ball A is dropped from the ts(*qai oqr)j0vqi7 /m op of a building. One second later, ball B is dropped from the same building. As time progressq7 a is/qmi(r*q jv0o)es, the difference in their speeds

  Two objects are thrown from the top ygsvzi*/si3b.;gq:g of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds whebqigsv.g *: zs;i3g/yn they hit the street?

  A brick is dropped from the top of a building. A secorud :j.02 uw1tugaja 3nd brick is thrown straight down from the same building. They are released at the same time. Neglect air resistanceuu.r:awu23 jtd 1gja0. Compare the accelerations of the two bricks.

  An object is moving with constant non-ze86*ks ix/nm znro velocity in the +x axis. The position versus time graph of this object kisnnx z /6m8*is

  An object is moving with constant non-zero acceleration in the +x axis. Tu) ;z+v l 2ker)jl.xjj0w*cvehe position versus time graph of this objecevu jz.xj kc0;lj*lw)r+)v 2et is

  An object is moving with conskvpa9sj+6h)u sks.6ib +pt l.tant non-zero velocity in the +x axis. The velocity versus time graph of this juh .ts.p+s6p+9a6k b ksvli)object is

  An object is moving with constant non-zero acceleraj6g325 abqe tr(wwp f0tion in the +x axis. The velo 6ew 3 fqgr(aw2b0jtp5city versus time graph of this object is

  The slope of a position versus time graa spy vn.6oro9.1g l7lph gives

  The slope of a velocity versus time graph givezchzt4ll3 h:* s

  The area under a curve in an acceleration versus time graph g:7+1 g jqbepzemz5t3tives

  The area under a curve in a velocity versus tim,6lx5sqwne,xnr 4n7 s e graph gives

  If the position versus time graph of )x5) o bmvmw4dan object is a horizontal line, the object m)4)o mw5xv dbis

  If the position versus time graph of an object is a vertical lz 7sbot3 6vyb( uqc7wlg(1es.ine, the object isw7tsb6l o(yz 13(ues q7.c bvg

  If the velocity versus time graph of an object is a horizontal lz8z gm/;w+ e6mwz+gk uine, the object immw+wzu+8g;6/g zk z es

  If the velocity versus time graph of an object i -rr0*lug lls7 kjvl.7s a straight line making an angle of 30 degrll v .jgsu-rl7 *kl70rees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the dis (irp:*qz4bxjx 3z 7ustance traveled and the ma*u 47xrp:xq zb3sz( jignitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to move 12 kn8hsip,fow 5 (jjfhsup -mf2eag+8- 8m upstream i8(5hisff -f n2 pposmge u8j,-j 8h+wan a river flowing 6.0 km/h?

  55 mi/h is how many mkf5b).tc3 u cc/s? (1 mi = 1609 m)

  What must be your average speed in order to travel 350 km in 5.15 ./iw6v6j( b(hbks(vi 0c mxavh?

  A runner ran the marathon (approximately 42.0 km) in 2 hours ana 78kcuo4 e6ckd 57 min. What is the average speed of the run6k ac 784koeucner in m/s?

  A car travels 90 km/h. entdf, ;hg9j0jod l37How long does it take for it to travel 400 km?

  A ly (light year) is the distance thaz20 av2g gb(tut light travels in one year. The speed of light tbg2 2 (0auvzgis $3.00 \times 10^8 \; m/s$. 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 straighjmv ; ir(qq7s+t road and you look to the side for 4.j mi ;+sq7rvq(0 s, how far do you travel during this inattentive period?

  If you run a complete loop around an outdoor trac;e6; pn ror5z-udqp5sk (400 m), in 100 s, your averagepp s-6uz 5 dn5er;ro;q velocity is

  A polar bear starts at the North Pbl 0,jd0 r+5/vdm xrenole. 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 takd0xjed / rnbm50 lv+,res 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. Ix7cc 6nh0h*xxt travels 1.0 km south, then 1.0 km east, then 1.0 km north, theh0h7x c6c n*xxn 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 55et8-l8q.qp/kt4qujd u,x 4eg2gk,kh 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. , pxku2h 8tgdku.ql, ekq8/jgt-q44 eHow far is your hometown from school?

  A motorist travels 160 km at 3 ;zokorbyq/tpxkz- 1 tqq*n.h2tu/680 km/h and 160 km at 100 km/h. What is the average s /tx1q3 rtbn-;yt q2.ko *pqz6okzu h/peed of the motorist for this trip?

  A motorist travels for 3.0 h at 8(v1 vhza:cu)/n5p6 p)vmb1 e proie+ w0 km/h and 2.0 h at 100 km/h. What is her average spb1v/pc 6rv+ze mni h)upea:5wp(1 )voeed for the trip?

  An airplane travels at*o lfnbf a.0p)a+fdv+f :gah/ 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the a:o+.fn) ld fh*pabv 0a+gff/a verage speed for the trip?

  In a 400-m relay race(s;ucl9m cml)yra b .+ the anchorman (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 order that the team A runner not lose the ra). uayr9c smlb(c+ml;ce?

  A car decelerates uniformly and comes to a stop after 13 s. The car's average v, i;fo*ykwcfv3 0 w,bqelocity during decef3okic; w0wyb,v f,q*leration was 63 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 ofe3 wspcbb8*n8 mqo(002ojxzv,gf. r x 88bqco,fr* s0vpo wj(x .bmzne23 x0 g$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate )71 k/r7aeea53lqlelbi )d ppof $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and a.e -b)e)jmvr jlit /7eccelerates 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 with a constant accel 6jk;zbvy).g yeration ofb.6;g yv zy)kj $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial dpz-7l:g d bz1velocity of 1.3 m/s experiences a constant acceleration o :gl7dz1-pdbzf $3.6 \; m/s^2$. What is the cart's displacement during the first 4.5 s of its motion?

  A bullet moving horizontally to s9iue;d-u2vpthe right (+x direction) with a speed of 226 m/s strikes a sandbag and penetrates a distance of 38.20 cm. What is the average accelerau- ; eu2spd9ivtion, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catawftd))m)wzi mb;wd 9an0;t9upult on an aircraft carrier. It reacw 9n;;90tz )m )ua)wfitd mwbdhes a speed of 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 *9a0lhz 9n zwsz1l(d)za:x s jrest 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 distance of j+rt o-tgmy36qfdhf)+x.q hlg-:c- k200 m. What is its average accelerat:-jg y+)rhcq. xftkhf+ q-d3m6 g-tloion?

  An object starts from rest and undergoes u,;-jje4s nesk7yk 1-+bshae j niform acceleration. During the first second it travels 6.9 m. How far will it travel during the thirjj-+e bhs1 s y4;,se-ejk nak7d second?

  An object is moving in a straight line with constant acceleration. Initisbe .me pv.ue.:nq:0 l1/qpabally it is traveling at 16 m/s. Three seconds later it is trave .:0vemb:p /l1eaq.sq.nbpue ling at 10 m/s. How far does it move during this time?

  A car starts from rest and adcykbl. zeoi2) 89(r pccelerates 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 decelerate at j(x).sjl g;qmnlz6h +7 c/4 a6n(lyu 5sv otmrabout $5.0 \; m/s^2$ 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 ord r67k;f0ht has been waiting at the intersection starts ahead with a constant accelerar;7krfdh6 0ottion 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 09efg yyo0))uk4jq lj speed of 12 m/s on the surface of planet X where the acceleration due to gravity 0g j0yql 4)ekoy9j)f uis $1.5 \; m/s^2$. 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 wjj nuedq-tunb7p:4 3+i 5*kchhere the acceleration duenbe +j u t7-3j:k4cpdih* qn5u 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 theqok 8g25x 5fs6+dtslp surface of planet X wheref 6 2gs5so5kx+t p8qld the acceleration 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 spm et:af86l07j cd+khneed of 14 m/s on the surface of planet X where the acceleration dudm atflecnkj+h67 08 :e to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usuaa oq r)w)0eb:g9jo87 uzqt 6dclly greater than 0.10 s. If your friend holds a ruler b d zur90coqw)a t jgq:e8o7b6)etween your fingers and 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 mf9gp /j*p9;mcrd2 76kxg rbod /s. What is its velocity after 36o*dcf 79 gb/kx;9rpgrmjpd 2 .00 s?

  A bullet shot straight up returns to its starting poe .:mhyq9bhat+ )(- hudfc.:3qniwea int in 17 s. What is the initial speed h: h9i u.. f-bw :+eehy)da3nmqctaq(of the bullet?

  A ball is thrown straigh4cztmk6fr5 9gr 9 xh lkb+o4cv1*ri8gt up with a speed of 36.0 m/s. How long does it take to return to its starting poirko44k+r5 f8zcr9bx6hc gvt 1mlig9 *nt?

  A ball is thrown downward from the top of a building with an initial speedlh/pz2 5-x0t-2vj t-saq.7njlwr o gd of 21 m/s. It strikes the g q tshop52g 0-jjd.v -razlx-/2lwnt7round after 5.0 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numerical vfgkwc ag2t9i 783,jaq7c vz* halue i z7* cqkh ftgg,jc 3wv89a72ian 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 witz0oqnk z1o7z7 n0-mkqq,cu;0 l jkw6lh a speed of 47.6 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 1 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 is the5 tmh w5 9qkqnv6g+ue+sf+)o f velocity at t = 1.0 s?

  In Fig. below, what i obv(9wz+/v seori s+/ zu42scs the velocity at t = 2.5 s?

  In Fig. below, what is the velocity at-s40wqhz pni)uw6ypp 0:ayn hjc5* ,a t = 4.0 s?

  In Fig. below, what is the velo 5w k5biataw:2city at t = 5.5 s?

  In Fig. below, what is the average velocity frombisoo vh 7(4hs 5nsd 3(ti0vs, 0 to 4.0 s?

  In Fig. below, what is the av mz:n3o-pigx. 2+mp/uux,ge nerage velocity from 0 to 6.0 s?

  In Fig. below, what is the accelera (u*hjy* n3wh+s vvli(tion at 1.0 s?

  In Fig. below, what is the accelexs lba6zg-pt 2,ys /p)ration at 3.0 s?

  In Fig. below, what is the average acceleratips on87 s 6pglk.iq;b gquf65.on from 0 to 5.0 s?

  In Fig. below, what is the average acceleration sz ek8ne7t(ha 61c.d-p(k t ddl jj*0nfrom 0 to 8.0 s?

  In Fig. below, what is the displabepx.z+ou9 +-gmaj5 w cement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? rhtsl .k/* e:(g/lbm 1lmh+n(cm:t ul {speed|velocity}

  An object can have a varying speed if its velocity is w :1gah/om 6etq) u)t3i1 eleyconstant.

  The velocity of an object can be negatiy8o3 4f 8:jez(wt*c- cpz mbabve when its acceleration is positive.

  If one object has a greater speed than a second object, the first must have;qa nvy3nb:b.zp0 /1;pskeg k*h e ez1 a greater accelerak.;qva1b1:zee0;np ysgk3z/ ep n* hbtion.

  Two cars emerge side by side from a tunnel. Car A is traveling f7.1 r1a+gtw hsuv-m zwith 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 xjh ighav7v; w ),k14xzir 0:lacceleration decreases.

  A baseball player hits a foul ball straight up into the air. It lebyu-j j 1cy(b6aves the bat with -b(y 16 uyjbcja 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 acceleration0sc0 em1 b4sem, how does it change if air fricms01 sebe04cmtion is ignored?

  As a freely falling object speeds up, wa zomv(. mib. lk4dr: r92tgx1hat is happening to its acceleration, how does it change if 4 dav1m.rb : rg(92 klomizx.tair friction CAN NOT be ignored?

  An object that is thrown nxodi4qcwd, w;d1- nc)++ hf;f5y c favertically upward will return to its original position with the same speed as it had initially if air resistance is negligible. If air re)f,hn1 ++yw-;dicdx4q; fca5nd fcwosistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at the samy 985dvnugxymj6t c3d /bsk c(y),3n me time.

  An object can have nonzero velocity and 2od1-bq 6 h dgrjuaw*:g,+gaphbx .d (zero acceleration at the same time.

  An elevator moving from the xzsgn9 (:( g )qkd/h+cys8fqa second floor to the fifth floor making no stops along the way has zero acceleration all t:ag qznyq( g8ks 9+ csx)d(fh/he time.

  A rolling ball movesj6if6v;ic p3w6 z x)cy from $x_1=3.1 \mathrm{~cm}$ to $x_2=-7.3 \mathrm{~cm}$ during the time from $t_1=2.3 \mathrm{~s}$ to $t_2=6.0 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.2 \mathrm{~s}$ is at $x_1=2.8 \mathrm{~cm}$ and at $t_2=3.4 \mathrm{~s}$ is at $x_2=8.5 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quar k.dti x;9th7g.c0ctj03mmu nter-mile ($1 \; mile = 1609 \; m$) track in a total time of 12.2 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 a0l 8dvglj4 4 z+n+bfp cxvw3692 m away in 12.2 s. It then turns abruptly and gallops halfway back in 4.5 s. Calculate (l0g+pblfvjx4 6 ac+4z 38vwd na) 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 efuewz*tg 2n qt 2lo0f;,xw dj.hf13ruh9 7y7 $12 \; m/s$ to $25 \; m/s$ in 5.7 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 frobj g13g8/z 3sdk /z iox5hkc)um $18 \; m/s$ to rest in a distance of 58 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reac3kx.g9lc s,d apkni.1 5q7bxk 5mnpa:h a speed 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 blocks to essentially topv /si*2tg.n3hp lf 3sk r-nww) speed aboutv gf* w /pwtnsr3.3 2hk-s)iln $10.1 \; m/s$ in the first 14.9 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 / ,w+ d8pa;k q.r9q hjgu6uvfgof $20 \; m/s$ to rest in 4.00 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 9cff -/ovf2ymd-rcv90 2 m long on the highway. Assuming a deceleratio fmcd9f/cy v-r0-2fv on of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a tru ufrz1u5 l0selc 67p/wck 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 completec4ay.f t. ,ebj the 10,000-m run in less than 30.0 min. After exactly 27.0 cf yb,.t. eaj4min, 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?    $s$