Suppose that an object travels from one point in space to another. Maa3 7rgzhe7 11ih igtr2ke a comparison between the displacement and the distan 7rir g17h3tah2 gez1ice traveled.

  When is the average velocio8+ppb mpc2/7pcg s fez )g1 zy(i:7ehty of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty kx p(-ym5* hfsin 8 s". This is a description o*hxsmkpf ( 5-yf

  An object moving in the +x ds)a-rq3 p6j aw*w q061i42 h6nt r1fljuqm bpaxis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling t2 lgrg(m75sn4b: sozlo the East (+x direction) begins to slow down as it approaches agobl2n:7 (szml54gr s traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow dow 1ebs 0;ot3cucn as it approaches a traffic light.oc c1e;3 su0bt Make a statement concerning its acceleration.

  Suppose that an object is moving with a cons4x: m tal wplzqi)mczu /0zdj2i10+0rtant velocity. Make a statement concerning its acceleration.zwru 2)0lctiz1a qj xidlmz40p0:+ m/

  If the velocity of an obj)--(h ffxlib7v bvipv,t -9nmect is zero, does it mean that the acceleration is zero? v-h)vi9x b nf,lbivf(m-t p7- Support your answer with an example.

  Can an object's velocity change direction when its acceleration is)9 m hd7jmoi2 q,gtc.s constant? Support your anhocj)2 ,.qtd7sg m 9imswer with an example.

  Suppose that an object is moving with con/1aa5 cp0ysdfstant acceleration. Make a statement concerning its adya/01 scfp5 motion with respect to time.

  Can an object have increa b8xbj5vjsx;1um-*z slb -0gksing speed while its acceleration is decreasing? Support your answer witlu-*0m;vk5 z8j1jb-bxs gs bxh an example.

  Suppose a can, after an initial kick, moves up aloyf/ik* vaxlabu;e/w6pz* *2 d ng a smooth hill of ice. Make a statement concerning iiyz ;2xa uvlk/ w/fa*6e* b*pdts acceleration.

  Under what conditionw ;w4e8c lu 62rjsz9jl is average velocity equal to the average of the object's inzwc9r j; 64l8s2eujlw itial and final velocity?

  Objects A and B both start at rhw(a;ga.zx y ,h.r:dh *7-c zatnt z/aest. 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 that of ob. zgd: zc;nza w7h ( /hat-.ax,aryth*ject B?

  Objects A and B both start from rest. They both accelerate at the same rat;-w; wtck5kj he. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared t-t;jck k5hw w;o that of object B?

  When an object is released from rest and falls in the absence ofd ao kxok raj:u y+17:v1dp2i) friction, which of the following1ad: :y kuxk+p7vi)2doa r jo1 is true concerning its motion?

  When an object is released from rest and falls in the absence of frictioncoq-jnq*br*pv/o-va.cd0 y -, which of the following is true concerning its bv cd- . y0*/-*njq-rqaovcopmotion?

  Suppose a ball is thrown straight up. Make a statement about newdn8 5gk6vs827tb1zbq 6lo the velocity and the acceleration when8zodb6lq wk75ns1g e2b8tvn6 the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its x5j+9 tsyt0;:b1 ce qwngw)mdacceleration just before it r)ymtd n ;c9t:wjgx+qw501seb eaches its highest point?

  Suppose a ball is thrown straight up, reaches a maximuszh1 hvvko: i3/9j-qw,d1 xv9w) lufkm height, then falls to it1:f-hzo3ku9lqhd9v vw x1kv/ ) s,jiws initial height. 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 +s4qsxkf;r 0gliw4 + smaximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is comin4s+fk;wqs x0is4rg l+g down.

  Suppose a ball is throwxav+r lf(* hg;n downward in the absence of air resistance. Make a statement(v* ;xrfla gh+ concerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her acceleration wo.yh j/ bev//gsi m1 m1 o66rhngl/td5hen she she reaches termina rovj/sh 1 5lte y 6om/n.//gbigdhm16l velocity?

  A ball is thrown vertically upward with a speed v. An identical seco/ c d-rj zv)b0hd.6qx y6rp:jq l1oie3r:hxu9nd ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the secondrl: hr6j pd1d9 uicq yvb:/hj-o6xeq03zr). x 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. q9dc b-k)mt;n 9ckg g;One second later, ball B is dropped from the same buildi;bg;c9kgqt mk -ndc9)ng. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, ball B is dropplpg+he nc5t k3y24zh nwel/95 ed from the same building. As time progressy25/4ekg5 plzhnn9 elw+t3 hces, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown up, and tm n1sa7fr0 ;bzhe other is thrown down, bot0af7bmsn1 r z;h with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a b gf/hdzurmkz3 djq0,b,g 43f*uilding. A second brick is thrown straight down from the same building.f* h/0zuqz ,bjgrk ,d3mf3d g4 They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in ths 5a;.qfulym 8e +x axis. The position versf y5lu8.m q;asus time graph of this object is

  An object is moving with constant non-zero ac o4bws chpbsx(i;.i m a5;-xb:celeration in the +x axis. The position versus time grap.owibcb s5xp;h(xbsm; -:a4 ih of this object is

  An object is moving with c 4)(b;dkhp z )vbb us0 /3vlcn/:thugaonstant non-zero velocity in the +x axis. The velocity versus time grapbhps03//dbavh)u gkb() nt l; 4vz uc:h of this object is

  An object is moving with constant non-zero b 9 vvbe c6w0;s6b+igsacceleration in the +x axis. The velocity versus time graph of this object i6bc bes+ 6vs 9vb0iw;gs

  The slope of a position versus tx(uiae g-qjt hx;un1 qf -:/n6ime graph gives

  The slope of a velocity versuiu3qbu9 ;b :khs time graph gives

  The area under a curve in an acce( uowlc*.)jshkcv-;w leration versus time graph gives

  The area under a curve in a velocityy,e ..uk9h nik(o9zm8q3pwq y versus time graph gives

  If the position versus time graph of an 0*i,m*oetcvvswtg4n c6)-b cy0qj*fobject is a horizontal line, the object isqvmj0n iywt,eo* fg *6 ct4*ccv b)s-0

  If the position versus timss*pk y(.srsa(4x 0 j8x9qmgae graph of an object is a vertical line, the object isx0 4a*r sqs9x( aps(kmj8 gy.s

  If the velocity versus time graph of an object is a ho5u to8rpoud6m,* 6a ltrizontal line, the object ou68od m*5,l a6rptut is

  If the velocity versus time graph of an objec;yvaj9p .w6ouf; ahb2 ,sl2qjt is a straight line making an angle ofuaha2 j9q;w,sj;62 vy.bl ofp 30 degrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m scu4v4n7:k25 f:tiy w lpwd l6gouth. Find both the distance traveled and the magnitude of the displacement w5p4 6il:kctugd4nwv7 fly 2:vector.

  A boat can move at 30 km/h in still water. How long will it take to movk h7w2f31;iel y)mjrke 12 km upstrrw m y)ehkl1ik2jf7 ;3eam in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 16090t5m*s( -ok bomwu u3i9mpip( m)

  What must be your averao,vao+g;v3wee .tp9 oq aeh a5,8gp1nge speed in order to travel 350 km in 5.15 h?

  A runner ran the maratwz d ow-ec9 i9,0onac0hon (approximately 42.0 km) in 2 hours and 57 min. What is the average speed o, zwwoc 9-onaie9d 0c0f the runner in m/s?

  A car travels 90 km/h. How long doel p(5/x 4mezlms it take for it to travel 400 km?

  A ly (light year) is the e9 2 l(kfs1bl:tmf*)u ayi;judistance that light travels in one year. The speed of ef:u2us9tl*f b()l1aymi k; j light 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 straightz8x hy* lhkx r temrymt -/h)+9d:o.t- road and you look to the side for 4.0 s, how far do you travel during this inattent.yyxtxzm r lt*e)/8-t + :9mokhdh-rh ive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s,,adc2.jwu wwj)dz gk :is-5p4,,clr p your average vg4w rjpli, dj5p ,w ccd .,wu-):k2aszelocity is

  A polar bear starts at the North Pole. It travgk;ntvs04oz y1 yv9kz6:hmy6els 1.0 km south, then 1.0 km east, then 1.0 km nort6okym k ny0sth 6zv4:1v9z;gyh, then 1.0 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 North Pole. It travels 1.0 *l3;x 8ajwoymdj6) kskm 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 aver x;6sdk 3ljaw8j ym*o)age velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 mi5 qlg l5,m89t;x;u tmvevis4 qles. It then st tgtmliqmvs x58,q ;9;ulve54 arts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at .d;n1 atx +y6 -sqpx0(stwa gz80 km/h and 160 km at 100 km/h. What is the average speed of the my (.xzta xgptnd-a+;1q6 ss0wotorist for this trip?

  A motorist travels for 3.0 h at 80 km12bk o esr(q/i/h and 2.0 h at 100 km/h. What is her average speed for the tris re1kq2(bo/ip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north for* o17:t4rz bf)*glvuukn v .hka,tk+o 750 miles. What is1v*oun4 v,fta +kohl. g:btzuk)kr *7 the average speed for the trip?

  In a 400-m relay race the anchorman (the -w: f:21i* o aydadwn/tz9,smz zu ea*person who runs the last 100 m) for team Aa/1zdd n,*:tw:yam*-92zw fou e siza 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 race?

  A car decelerates uniformly and comes to a w4alu 1rj ;*4tzhlzb1 stop after 9 s. The car's average velocity during deceleration w4arj1w*zuh tz14l;l bas 47 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s tpjzu:l o sn/;-qp9 4szo 160 m/s, at the average rate of ujo /-q slzz4pn :p9;s$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h a:f 0ez8kmccjtzvcv zpr 2 4q5r*q1,6rccelerates 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 res6 /cd i0)21r33mwg8;czpl/ joxrp s ujyk1ftet 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 for 10 s. It then spee3.x9m7)i;ean safz;uv*w k qk/tp e,mds up with a constant acceleration oft3emsv)xa9k,euq ;p*.w / 7 ;kfnz mia $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial yk *lo4uayv9 3rh0 5yovelocity of 5.8 m/s experiences a constant acceleration of y4hv*y9o r5yku3oa 0 l$3.2 \; m/s^2$. What is the cart's displacement during the first 5.0 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed o-t 0 q:scdd8yif 552 m/s strikes adyqit0c8s d-: sandbag and penetrates a distance of 21.17 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched faa )jud/vxc*;e6k /tzrom 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 is constant, what is the lengtta )*z;/v edxak6u/cjh of the catapult?

  A car starting from resi +f cbtkjhzen02/ 275p8j wtvt 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 f 6r3qdtdxqt qi* j;t9 6a+zd480 m/s in a distance of 200 m. What is its average accelqxtjfa ditd+q36q4z;9 dt*6 reration?

  An object starts from rest and undergoes uniform acceleration. During the fe gexh1t6yys3jt1t) *irst second it travels 2.2 m. How far will it travel during the third second?tjy g) hsex3*ey1tt16

  An object is moving :qa01w4w mspv-wq rxi :kq71)fv9 krxin a straight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it a :rx9-4r:qsqvvw7f01qpki)wx 1 wkm move during this time?

  A car starts from rest and acceln-;m(fqlmn*:.df7 e m0bncinerates 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 decelera vfr(f(jrwh4c 0z-z l8te 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 ha gx/8:lpjo)t 9 rf0fsos been waiting at the intersection starts ahead with a constant acceleraor) fj/o9t lg :8xf0sption 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 o- shil*lbh.- wv+ 49uvijh(zln the surface of planet X where the acceleration due to gravitj.v (sz-hlu *+hwvil9l h i-b4y 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,: v lgsny(gou.rn// f m/s on the surface of planet X where the accelerati:luvn/ ygs(r /,.gfn oon 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 on the surface of p svz-g7im9uy nm8+,s*b+woe(a-qa y ulanet X where this,a- vq-9ym*7 w8 bzoyun e+sa+u(gme 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 speed of 14 m/s 9m5o gs6-:i4rnqgbf9p wh ,b xon the surface of planet X where the acoqs f9pb ngbwxih,49:6r-g5 mceleration 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 y;mzi* wvz vtq1:j;)q by-q6ifriend holds a ruler between your fingers and releases t w zm ivjq;y:z* iy6;)q1-bvqit 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. Wha:n0kqxh/-zmzy 8qjr *9uah k-t is its velocity after 3.00 m*k:jy-r/q zhx9ha0 qzk n u-8s?

  A bullet shot straight up returns to its starting point in 11 s. What is the i/h 2xkgme/ ol0nitial speed of l/0oxg2/ hkm ethe bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How lf;edaq 0jpji ,j)a.x )ong does it take to return 0j ;pfaeq .a)jj)ix ,dto its starting point?

  A ball is thrown downward from the top of a building with an initial speed of 94bt1o7 x; ,knuxcdh4j m/s. It strikes thexo4b unk;x71 td jc4h, ground after 2.4 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numepmsdi7 4u6px *r7rrv rfu:g 0:rical value in the 6:r p7irxprfuv4*:0r g7usmd 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 a speed of 35)g-z l.kk sr7p.9 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 13 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 13.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity .e-aga(4ok .h1iuuydat t = 1.0 s?

  In Fig. below, what i:5-yw kcqead 1s the velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4ybpe/ft jf6i-ai7-ut 5:; y je.0 s?

  In Fig. below, what is the velocity r1sv2 wnha xo;pbg i3jtyu1((9kzd7- at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.0 w pb/t:g4(a :u 3pwocws?

  In Fig. below, what is the average velocitto g *yw;wg6sqx+0-d:6btmlcy from 0 to 6.0 s?

  In Fig. below, what is the accelerati/g3oph.ezb g7zdbe* jp 1wh1)on at 1.0 s?

  In Fig. below, what is the acceleration at 3.tnerxs 0 -* f)xqk(ybk1igolc0 *9v)u 0 s?

  In Fig. below, what iq e ob 2(w,cf.md5ct1xty.ai0s the average acceleration from 0 to 5.0 s?

  In Fig. below, what is tdi2xv; bsv u42he average acceleration from 0 to 8.0 s?

  In Fig. below, what isa:+b2qrnimurw8y 2* c the displacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|velo:+anzc 9zylr(n8hr w1city}

  An object can have a varying speed if its velo8gr +m3rrkfxyzqw)l-,86 , +)mkkmfn wzt;qkcity is constant.

  The velocity of an object can be negative when its acceleration is pls)egqk 36wxom :6wf1 ositive.

  If one object has a greater speed than a second object, the first musttb3rw +r.bl3 3pt6.x jx3kaxy have a greater acceler33tbtr.k6jwalpx3 b rxx3 y+.ation.

  Two cars emerge side by side from a tunnel. Car A is traveling *2zx5hhmho/8 /eaqsgwith 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 incre9f duj3/xuu*0p3 + ut-iqplypf d ,+gtasing in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the a)dz6 b4cn3dy, xkmy0c8;n sz air. It leaves the bat with a s8,cyscn b zma)y0 36xdnzk;4dpeed 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,,cf5 x-jnr4 is ajb:2i how does it change if air friction is ignorb s-f iij4, cjar5:2xned?

  As a freely falling object speeds up, what is happening to ityj -xuoqd5sn7(4xi+ ws acceleration, how does it change ix475dix s +qunw-o(yjf air friction CAN NOT be ignored?

  An object that is thrown v:b6v2es9xr +imej9: /z vvsq jertically upward will return to its original position with the same speed as it had2mve 9j jexs q9i z/bv:r+s:v6 initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero accelez hq zqfv7449q bjht7)ration at the same time.

  An object can have nonzervvxmtn hkc(1hc-0h ,j23ba 6bo velocity and zero acceleration at the same time.

  An elevator moving from the second floor tsssl :sobq,d f o.jvkyz/y3u,3;7i6u o the fifth floor making no stops along the way has zerouv b szs/3fo6ilq.k ;37y y ,:du,jsso acceleration all the time.

  A rolling ball movesvxmk :9.oxwa 1 from $x_1=2.6 \mathrm{~cm}$ to $x_2=-4.8 \mathrm{~cm}$ during the time from $t_1=1.3 \mathrm{~s}$ to $t_2=5.9 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.5 \mathrm{~s}$ is at $x_1=3.1 \mathrm{~cm}$ and at $t_2=4.2 \mathrm{~s}$ is at $x_2=7.8 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter- 3zbur+ ::1ez9wk twrpmile ($1 \; mile = 1609 \; m$) track in a total time of 10.2 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 stra3re n:0j akr/+itdmu zh5z(+tight line, moving 88 m away in 13.8 s. It then turns abruptly and gallops halfway back in 4.7 s. Calculate (a) it(unizdr+5zme: h ra+kt/ 3t0js 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 frj2 k2vo*op q7rom $11 \; m/s$ to $24 \; m/s$ in 4.5 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 p97e.9ep slu *e zjsmo 8j(l7u$21 \; m/s$ to rest in a distance of 65 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a spept7h *x+xs6o ged of $31 \; m/s$ 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 top speed :h / plwn+1ujw(x;genabout e/ guwxhn1 lp;wj(n: +$10.1 \; m/s$ in the first 11.5 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 uniformut( oehx- 8 nmy3g7ry9ly from a speed of $18 \; m/s$ to rest in 5.27 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 thopv+cna 2-3pn cxir) uv0-r5 pe highway. Assuming a decel) nua prp5 p-+-x0icno3cvv r2eration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going 31hkht:n fobh(ih *6h $25 \; m/s$ 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).    $m$