Suppose that an object 5jic fg1 c507ir q u7dcxy:cl09/ibablv e+5 ktravels from one point in space to another. Make a comparison between theyxj d5 q iakfvcb75/rig097cu 1c+be l0 lic:5 displacement and the distance traveled.

  When is the average veloci.gb 94- qgrct *o0qennty of an object equal to the instantaneous velocity?

  A new car manufactureo :nzy )/asa+j8e.xjs mwv n/7r advertises that their car can go "from zero to sixty in 8 s". This is a jxv:no.yjw a a/8/ )e+m s7zsndescription of

  An object moving in the +x axis ewr6 e4f0x7oxv a pj l-q)eh;s3xperiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East pe9ac ao(:ct1m(j2a6 f df, dz(+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its accelerato c6p:(m(ad 1dzj2f t9fcaea,ion.

  Suppose that a car traveling to the West (-x directi7jov9uxz wrklk/6hht ;.*e 9s on) begins to slow down as it approaches a z.6o9ek9u;vrk*xh 7tw jls/h traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocibx ko;;, o/*ospq 0genty. Make a statement concerning0gop ko/*,xn; bs;eoq its acceleration.

  If the velocity of an object is zero, does it mean that the acceleration is zew4nh mnuph0u;:m/ z8i ro? Support your answer with an z nh:ipu/8hw;um m40nexample.

  Can an object's velocity change direction when its acceleration is fp8b ydm 4 3jj ckw-ltl;a0c3(constant? Support your an(d cfj pbay -m4;jc3 wlk0lt38swer with an example.

  Suppose that an object is moving wit2(m,pgii9ahy k5 ivq 2 ad,um(h constant acceleration. Make a statement concerning its motion with r2ky gapm5 hiimiaqvu2, d9(,(espect to time.

  Can an object have increasing speed whil lr5ot 4tmejqijgt26lq:h 0tzz; ;:)ve its acceleration is decreasing? Support your answer with an examl:25tr;l thmzq 4tqtiv)o z0;6 :ejgjple.

  Suppose a can, after an initial kick, moves up along a smooth hmr8kt g* ,t4cqcg/:d jill of ice. Make a statement rc4mj8q,*t /g gtkc: dconcerning its acceleration.

  Under what condition is average velocity equal to tzqk auuhnp *)*na-; k(he average of the object's initial and final veloci-azkanqk p(u*u) *;n hty?

  Objects A and B both start atk.*dp17q a rceljk*r crc5* e8 rest. They both accelerate at the same rate. However, object A accelerates foj1*erq*.p8k75c rl ecck dr*ar 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 from rest. They both accelerate at the same4fezn;/on*z;ftev p d,ab y2- rate. However, object A accelerates for twice the time as object B. What is the distance travz oa;n-f*/b, dzp4tnvy;fee2eled by object A compared to that of object B?

  When an object is redjt d m* 5ic8duz4: hb:h9ls3gd(ro7lleased from rest and falls in the absence of friction, which of the foltbm* l(ics5h3 zuodg9lj8d:r d:7h d4lowing is true concerning its motion?

  When an object is released from rest and falls in the absecl9 wvd,d.+s0v9dlet f:p5cince of friction, which of the following is true concp.+f d 0c:e 9dlwtsvdi9,l5vc erning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocity and7t bj nk1k;jo( the acceleration wo (j7jtnkb1 ;khen the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just before it igv70 lm(dk4ar)ept1reaches its highest 041emtai7rpd(g)lkv point?

  Suppose a ball is thrown straight up, reaches a maximum height, then fallsie5rft r/u bdj80u49df 8g :ap x63dxr to its initial height. Make a statement about the direction8g6ud9 :ax504i rrjref dxd u8b/f3pt of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum heigh: ygz+mcqnid9wr0.e zoj -m8*t, then falls to its initial height. Make a statemezqyj w +gr.9m*dm08oie c:-n znt about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of.wc g:x6cf /dv air resistance. Make a statement concerninw/6gdv :cf.xc g its acceleration.

  Suppose a skydiver jumps from a high-flying plane. Wq4:- df)fq klbq8jg8bquyg3*hat is her acceleration when she she f*d gybjqgu:38q l 4qkbq-8f) reaches terminal velocity?

  A ball is thrown vertically upward wi:te+hl8nyz zwy-y rnf-gd8 . ;th a speed v. An identical 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 first ball? (How many times higher does the second ball go than the fire8y+ z:wftr nh;y lgz8.-d-ny st ball?)

  Ball A is dropped from the top of a building. One second later, baluc-s1 ni3y8 h-w -ykpkl B is dropped from the same building. As -suk3 -kh 8-w 1pnyyictime progresses, the distance between them

  Ball A is dropped from the top vn0 hhf914rd-/o7mfov izj64 upjf +2bx7lds of a building. One second later, ball B is dropped from t mvz jfv2 +7hfid691s0b-jxhl/ 7fpur on4d 4ohe same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One ixy *8ty7g h4j/rgoq9ns thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit thhjn987o*y4gt gqyr x/e street?

  A brick is dropped from the top of a n zy*m 7hwez(;building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare zwe *myhn7z ;(the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x a)t s9pj8xc+qbbnbw :;xis. The position versus timenw9bj+b8)c : spb;qtx graph of this object is

  An object is moving with constant:nj hpg 0+kelpz/d ,-dfz5 ak8 non-zero acceleration in the +x axis. The position versus time graph of this object5kegznh-d ppa ,f+80l/:dkjz is

  An object is moving with constant non-zero velocity in the +x axis. The venh:7jn v-c8c51cha eplocity versus time 8h cn -1je75cv:c aphngraph of this object is

  An object is moving with constant non-zero acceleration in the +x4gcq.8vl 3 j2mbl.jg h axis. The velocit2.8 lvc lqbgjm3h.4gjy versus time graph of this object is

  The slope of a position versus time graphspnj5j /so,3k91pbla nm vs,8 gives

  The slope of a velocity versus time graph4n+v jvk4w ckneua iuue.7g(jr4v 7/8 gives

  The area under a curve in an accelerato k9xp(tu:r8yion versus time graph gives

  The area under a curve in a velocity versus time graph givep7,b ejfu+zpbkkd+ x-x96e,qs

  If the position versus time graph of an object is a horizontal line, the obj mh)puh1(k.v fect ipv k1.m()fhhus

  If the position versus time gr, yu16em+ jkv8qh2p fraph of an object is a vertical line, the object isy6rum ,fj+ep8v1 2 kqh

  If the velocity versus time graph of an object is a horizo/42 m0;h brmosh rps9qcbq ;9jntal line, the object ic0bq /m hbps2rs9j;m4ho 9r;q s

  If the velocity versus time gdybc+n: o,0 j/lq,r;n n,frcnf o4-xh raph of an object is a straight line making an angle of 30 degrees with the time axis, nnbcn,o,/4 j qon+-d fryh0flr:xc ,;the object is

  An object moves 15.0 m north and then 11.0 m south. Find both tc7vo p;vt2 4ee qft x5egw*t0.he distance traveled a0qfxt 4ev owpt;v7e5. gc2 te*nd the magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long wilgm):;( txq.d xety fe13v rh6fl it take to move 12 km 3fm htx;x:et 6fg1(r. ve)dyq upstream in a river flowing 6.0 km/h?

  55 mi/h is how many m/+ c8l wjtkh(;3h2q fjps? (1 mi = 1609 m)

  What must be your average speed ini 6 k-i0fct/a*yd3c is order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. 4ie x42dq8s;u)at;l( jvfrmi What is the average speed of the runnl8se(;ixv4r; d t jui24qfa m)er in m/s?

  A car travels 90 km/h. How long does it take for it to xv x *(9(e1k6jwu bzh2sddd x0travel 400 km?

  A ly (light year) is the distance that light travels in one year. Th5v, 6inijpc;yw,w n (ve speed of npc,6;v wyn( viji 5,wlight 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 roiy4j *ua;fd 5 qx+id4soo :st9ad and you look to the side for 4.0 s, how far do you trave9uijoi4f*o: a5d ts;syq x+4dl during this inattentive period?

  If you run a complete loop around an oupy9s . qzf/0vitdoor track (400 m), in 100 s, your average velocispf.9iy 0vqz/ty is

  A polar bear starts at the North Pole. It travels 1.0 km soo7c y t89c-iuhuth, then 1.0 km east, then 1.0 km north,9ciy-ht c87u o 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 j6f8(9r lwz;yn+zd ynecmgbe42g8e3at the 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 bea (c+34by jf8962z;gnyegdle mrnez8 wr's average velocity?

  You are driving home on a weekend from szk e, mo*)pf 83fnv;7 z7,q-ncablc uwchool 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 15c8n7f* ,7p m)elowu ;f kbq-3z zc,avn minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is the averag v von*pn lkn-*3p*qu *d8y23csmstr7e speed of oqp n-crln**nspst mv d*v37 ku*823ythe motorist for this trip?

  A motorist travels for 3.0 h a8bfaejm /fj1u.4pd 0*ak*qls t 80 km/h and 2.0 h at 100 km/h. What is her average speed f s*pk4.bu8q1e f*a0 jm/fja ldor the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h nw/)wj f. 6mh+a7lnjo gdw/e6aorth for w a/+ nh6edw)j6gfmw.7jla o/ 750 miles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100zb)bfqqt )t; ;4ujpnt rkun7puk7 (:3 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 rrqnkutb) 3jk)ztt47u(;;n :7fpu qpbunner 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 az ygdfkw8898-l6v.2t2v)vfe itzknw stop after 14 s. The car's average velocity during deceleration was 49 km/h. What was the ct68nfww2elfg) div 9yk v2- .vzkz8 t8ar's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average r1h zd82. 9a :blrzjicqate of .z qzh81jd 2raic9: lb$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate o h 9/dpohu0a+qljnxn kj67:z2f $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and accelerates mlnfy pygww.;*(-6 e xat $4.0 \; m/s^2$ 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 az b7 fgbgi(/+e:+c a)jz0pno xcceleratio z)gb+0z(xeb7 pnog:+ai fjc/n 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 of 4.4 m/s +j(y9 o*ta ftyexperiences a constant acceleration of ajyf*t9 oyt+( $2.6 \; m/s^2$. What is the cart's displacement during the first 9.8 s of its motion?

  A bullet moving horizontal bu; zo,+ j .y*-fk9so(aimrhyly to the right (+x direction) with a speed of 356 m/s strikes a sandbag and penetrates a di+z-hui.ya*,s o y; fbjmr9 (okstance of 63.07 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 car-n 25j 1cwmxxol is0;drier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the n idx 0;5m1jx2osw-cl acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with conpg0xfl. e / xx7*wk7kcstant 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 200 m. Wepuk,xot5ap97 a s9g:hat is its average acceleration ega,75tpp:ku 9osxa9?

  An object starts from rest and undergoea2ihe 60yj;h46)iqn +fzjqc ms uniform acceleration. During the first second it travels 3.9 m. How far will it travel during the e0y ;nc aifj6+6z i4qhmq)j h2third second?

  An object is moving in a straight line with cokb diw7 2 79uxq,4pkwb v l*sze+zj31onstant acceleration. Initially it is traveling7q4e,bk+2u*9wokxspzv dlb1 z3 w 7ji 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 accelerates u :bevdv30h8vc k;r gi1niformly 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 dx:-fknhzaf rm (6h8q0ecelerate 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 hl9hkm6;p:wc i0l sm+q as been waiting at the intersection starts ahead with a constallcs69m 0pimh +q;kw: nt 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 xi o)zazb ldic9u/ zj jf47(8:the surface of planet X where the acc: 7zj)i 9bdfui 4xzcz/8ojla (eleration 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 of planet X cf5; p -(kalm-gqce, owher,-m5;fca-qg(kolp cee the acceleration 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 m1)n5rao2f v1zbc ng;a speed of 15 m/s on the surface of planet X where the acceleration due to gravity is f;r nb 2gvmo5n1c1za )$2.5 \; m/s^2$. 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 thqd q)wcp (101vs ambu9e surface of planet X where the accelerada(pw) cs90bq 1qmuv1tion 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 friend14dn9x8gg kkp.c-j yqfdnjs2 l jw9+3 holds a ruler between your fingers and releases it wjwg+q 8f49s ldyck.d1j-jx2ngp9 k n3 ithout 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 is its velocity cqpsd,1 g5un7 *puv7lfomcu:6 wb( n9after 3.00 s?5qwfos7,lu ucmb6gdpvp:u 97( n1*n c

  A bullet shot straight up returns to its starting point in 8 s. What is t : d g4hftjtdfd43*ri3he initiattjdr ig4f*f 343dh d:l speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it take lso*b hztd kk07,k80ito re8ikklsh7t d 0bzko*,0turn to its starting point?

  A ball is thrown downward from the top of a building with an necsq ykbg;.z as.w 3,6x r:u7initial speed of 21 m/s. It strikes the ground after 7.3 s. gs zq; 6cs,.nu:.bwe7 rk yax3 How high is the building?

  A ball is thrown straight up with a speed +l w7x orbo/d rbs,v((of 30 m/s. (only fill in numerical val/dr7 bwoov(r(x,bs + lue 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 strar kameiq.v/q b 8 f),bkj+b186xz0baaight up into the air with a speed of 39.0 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 1 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 = 1.0 s?-cua6-dk;;p2 ,6qjw tjmboh v

  In Fig. below, what is the v) ;trai.diyk +xk.b urti0- :uelocity at t = 2.5 s?

  In Fig. below, what is the velocity at t vvb:burc4)+jv:ahz8c+q ( ob +fzch3= 4.0 s?

  In Fig. below, what is the velocv73ij6)bvkjr4/ .c )qlc gnqcity at t = 5.5 s?

  In Fig. below, what is the ayoxv v3ef0 ztq2*d9+iverage velocity from 0 to 4.0 s?

  In Fig. below, what is k +yc2pimq*jvnq.,,x the average velocity from 0 to 6.0 s?

  In Fig. below, what is the accelera2j6iiqj 6zn5 5 s*fvjdtion at 1.0 s?

  In Fig. below, what is ;:t7howkq r v r*x7z4tgg8d0athe acceleration at 3.0 s?

  In Fig. below, what is the average acceleratwg 87od4nkd .9cokgdo2)hz e )ion from 0 to 5.0 s?

  In Fig. below, what is the average accez 9uxtx41oxfb m33ad /leration from 0 to 8.0 s?

  In Fig. below, what is the displace 2;p 0dgftu/nv0xy z xh0c *eh,qq*4rrment from 0 to 8.0 s?

Does a car speedometer measure speed, velocitaflu);g5q4f rx n 45uc1 vq7rhy? {speed|velocity}

  An object can have ax 8/v4fac/+wh 0oirep varying speed if its velocity is constant.

  The velocity of an object can be negative when its acceleratkmj 50w+n :xypion is positive.

  If one object has a greater speed than a0q.ydy-j 6hf x second object, the first must have a greater acc qx0y.df6j-hyeleration.

  Two cars emerge side by side from a tunnel. Car wv /h*q4jx,, ut1eng r zfw(;nA 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 incru fmw2f3k/kpy-*sc e:8uwp. geasing in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up intocjva:na-svp yg:t9gq2/ m9eoe4-2jr the air. It leaves the bat with a speed a-cj y229:/qr-ejavvomgp 9: e4 tsgnof $120 \; km/h$. 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 upy:uv,oz,o g4xgl9a f;, what is happening to its acceleration, how does it change if 9a; guxfvyzlo, :o,4g air friction is ignored?

  As a freely falling object speeds uxb c5iydpfuwa16*+s jth 5, ;kp, what is happening to its acceleration, how does it change if air friction CAN NOT be *py;f+u1,kd5sica whj 5xt6b ignored?

  An object that is thro,j;5rrwb rt+0 ruf (vwy kw*1bwn vertically upward will return to its original position with the same speed as it had initially if air resis tb*(,b5r;0k1 wwuw +fv ryjrrtance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velosazefg kqii uq 23)bq,sz)be;*12p s g;rf73dcity and nonzero acceleration at the same time.

  An object can have nonzero velocity andxq3oq,zit9k r6r/p84 ew 6vq h zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making bi,nz)ih3 hf* *r2 tmfno stops along the way t*zf hhm,nrib*2i3f) has zero acceleration all the time.

  A rolling ball moves5ga)x x .yc 6/sjpf1n11jre :xj)lf rn from $x_1=2.0 \mathrm{~cm}$ to $x_2=-5.8 \mathrm{~cm}$ during the time from $t_1=1.9 \mathrm{~s}$ 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 $x_1=2.1 \mathrm{~cm}$ and at $t_2=3.4 \mathrm{~s}$ is at $x_2=8.0 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight com 4 (20hx,xua4 lyn8dl;)pt: otdljdlcplete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.7 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away fro oeq r ) bs-8i9bmc*b;lr/f9ycm its trainer in a straight line, moving 111 m away in 12.5 s. It c *i8q)e bm9r-cb /9boyl;rfsthen turns 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 fromo ;kl 3c+xw3sd $12 \; m/s$ to $23 \; m/s$ in 4.2 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 fromgqn, m;wvia97 $21 \; m/s$ to rest in a distance of 81 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed4eb p0xe7w/*/jgj rlkxlglic 7(3 qf - of $25 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.6 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top speed abor 99dtfbd94rimni.xo e22 o9w u4i m 29dw9ext o99. fri2rnbdot $10.6 \; m/s$ in the first 12.0 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 n,zuvaov e,ew 7f;trct1-s 2*speed of $18 \; m/s$ to rest in 5.56 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 highg6y3 mc w wij*)1yb.vqway. Assuming a 6y*)3 w.ymj w1q gvbcideceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$