Suppose that an object travels from on- hhehqn,tn24pvh8; ce point in space to another. Make a comparison between the displacement and th ce2hn-p8; hh,q4nhtve distance traveled.

  When is the average velocity of an object equal to tki do3c8e+bcs f61v9 jl4yj:dhe instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixtystyr(+ul ;wy31,rq e1p.x qnq in 8 s3rrx1 qe p+ ,ys;u.lqy1q(wnt". This is a description of

  An object moving in the +x axis experiences an acceleraq* uzh a./*)qppw z0u6yoqs m5tion of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow down mrnuyr6m gt+ 0;l g(s,as it approaches a traffmlnr;0m(,rgt u+y6 gsic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) beg wqn/ m26ncz+ f))1aooln sf*qins to slow down as it approaches a +q/ f)n2n)o6nf* lsqa1mcwoztraffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a statement conqwxhn0k t8 m6u0d)ru2/ cjlx d02v1btcernibjtd 1 0xn/x0kl8c 0m2r2w6h d t)uqvung its acceleration.

  If the velocity of an object is zero, does it mean that the accelerati)0(ard)f cci zgm7zjg3 .cz oi-mw- n)on is zero? i z mc3() cw- -o.0z7n)cjfa zmiggrd)Support your answer with an example.

  Can an object's velocity change direction when its acceleration is constant? Sfqj.1f55 a q/gk0p7jgllv.r iupport yo f1igl.a j57 rfp5 /kjlv.0qgqur answer with an example.

  Suppose that an object is moving w -eylqsl5 wix8).ekykdt9f(- ith constant acceleration. Make a statement csiy5k- l) -x.yf eewqt(d8l9koncerning its motion with respect to time.

  Can an object have increaa rmj2s0k5,zdg r48 cxsing speed while its acceleration is decreasing? Support your answerjgax kc5 d2s4,mz08rr with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. wcx3cmdk-euxtj02 y;)rl cq 3uqf7 o**4e l0h Make a stat0)kl yo x0wl34cc ju2rutmh qeed;c* q7 f3x-*ement concerning its acceleration.

  Under what condition is average velocity equal xj-s,zcz npir 2-;p ;cto the average of the object's initial and final v-2xpr s, i;zz-np c;jcelocity?

  Objects A and B both start at rest. They both accelerate at c.z)vmx omi5( cezu:1the same rate. However, object A accelerates for twice the time as1 u:e oc.i)mc5zmx(zv 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 same rate. (nnxe d98lgqz7t is9qye6x43 However, object A accelerates for tl8qqi7g3xzs6en9x yd 9e t(4nwice the time as object B. What is the distance traveled by object A compared to that of object B?

  When an object is released from rest and falls in the absence of fvu-jb 7x-yb9dm b0fk +riction, which of the following is true concerb+-x- m7vfy0bdu j b9kning its motion?

  When an object is released from rest and falls in the absence of fru+vb/zo tvk7x,- aox6k1)tk n iction, which 6ztkook7, x/n-a 1xv)uvbt+k of the following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a8-l z,e*g5s wobhd +gx+h u,xy statement about the velocity and the acceleration when the ball reaches the highest point.d 5w ,+,8bxgzhe u-hxy lo+gs*

  Suppose a ball is thrown straight up. Wge629 u0y8z) n ibrg+6+eguz-g*c b2 nnzargthat is its acceleration just before it reaches9engby gt+ ebcu0 zn 8g2-)r26agzg6rz i+ un* its highest point?

  Suppose a ball is thrown straight up, reaches a maximum heigh (y mq,) pepxdph/0u,ht, then falls to its inip,pmp/ yx) qhhdu,0(etial height. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight7k.qbm,x 108eqw 6 (lac/iomunfy4s y up, reaches a maximum height, then falls to its initial height. Ma un 7lec01,yw(bk46fyi8.msq/ oqmxa ke a statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resi ea yjuvt nl) gk+-:oza2,0m4kstance. Make a statement concerning j0 4mlz,+ego-2uk:)y v tkna aits acceleration.

  Suppose a skydiver jumps from mk-(r 6a .pgylg/v8mv a high-flying plane. What is her acceleration when she she rr/.6v akm(y-8g vpmlg eaches terminal velocity?

  A ball is thrown vertically upward with a sped. xskduw 5(p q0j3*qied v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maxim5pwqusi*.xk0 j3(ddqum 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. One se5jui jf,z3 xhw,4e 6lncond later, ball B is dropped from the same building. As time progresses, the distance betwee6 leh5zun,fjjw i34x, n them

  Ball A is dropped from the top of a building. Oa).s45g uep:lrlf qj+ne second later, ball B is dropped frqpgs jer.l4luaf+):5 om the same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown up;h*(eombxxs ly:r6b *, and thmxx sb:e; h6bl(ory **e other is thrown down, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a5p9:somw 8 sv jc;bc6+ tlik3ovel-a2 building. A second brick is thrown straight down from the same building. They ar9s aopwmt v5csb3 ok8j- ; vce6i+l:l2e 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 the +x axis. The posity u /axdb-7*fa ds.i,iion versus time d *yas-fdi./7,iuxa bgraph of this object is

  An object is moving with constant non-zero accelera -b)b:ckwfybt8+oapwi q );, ption in the +x axis. The position versus tiow))ybb+k; cwf:a,qb pt 8-pi me graph of this object is

  An object is moving with constant none3 de./ntq ji9-zero velocity in the +x axis. The velocity versje.39 t/de qinus time graph of this object is

  An object is moving with constant iilp,m-q );b48jm i5alw+jk .kwfv/t non-zero acceleration in the +x axis. The velocity versuvmf8i al-iwq +wk .;/ipljt,)j5mk4bs time graph of this object is

  The slope of a position versus w5xu4ezo;,nigvr(x 4f; 9 -/jtoypuw time graph gives

  The slope of a velocitrz ;bs:4 gr;esy versus time graph gives

  The area under a curve in an accelerat01gx g k:jin7rion versus time graph gives

  The area under a curve in a velocity versus time gy 8mf9qn.kc5xraph gives

  If the position versus time graph of an object is a hork* ;imnnk/qa+ h3bs u:ddy.*dizontal line, the object ayd/.bdnd; mqu s:* nk k3hi+*is

  If the position versus time g +uw/7okeu30 bh1zdroraph of an object is a vertical line, the object iso0k317u/bodh wue rz +

  If the velocity versus time graph of an object is a horizontal line, themqm9 r4yx9 ,*ch*xpey object im *x ,qcy 4pr*e9ymh9xs

  If the velocity versus time );znz il3pbi.4lflvlz -l6t+p y k *r2graph of an object is a straight line making an angle of 30 degrees ly-*;z+ i)t pnl.2vlzbkf3zlil 4pr6with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both theo bo .fe;y96yc distance traveled and the magnitude of the b; .oo c6fyey9displacement vector.

  A boat can move at 30 km/h in stezr/. c8egxtk+,5yfy8) vy4eu dej j6 ill water. How long will it take to move 12 km upstream inyfj.)ztvec dygxr ee46+ u 885/,kjye a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = .oaq;*uj rkboc(,30 kd ap8ho1609 m)

  What must be your average speed in oxj8hzoy,o,pqspg 2y3 d y1 .6hrder to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. Wh x-fo)6p sv,wvwc5q i.at is the average speed of the run) iw.6sc,5wp qx fvvo-ner in m/s?

  A car travels 90 km/h. How lo6na0**irfloe v +dzv ,ng does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. The speed o:g72 uxg4ew:thek; x9y1 krpzv:+b xnf light is +xwv7e xyn:9:r4pubz: ktgh;xe12gk $3.00 \times 10^8 \; m/s$. 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 dz tv*a .n*rb:h.l erugf: 4(qand you look to the side for 4.0 s, how far do you travel dun(r v. b.:tg**fzh4re l:dua qring this inattentive period?

  If you run a complete loop e h4k jq1/ jlvkqo-6a7around an outdoor track (400 m), in 100 s, your avera/kv6oej qk-j7a4l 1qhge velocity is

  A polar bear starts at the North Pole. Ipv4 sr8.1 xxc,a qlh1jt travels 1.0 km south, then 1.0 km east, tr1h 4p1sxx8 ja,l.cvqhen 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 average speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km eb.as umhg.sn b;e0.r 2ast, then 1.0 km north, then 1.0 km west to return to its startingshb.sun.m ae2b0r ;.g 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 mileskey beba5: i1 g *,,u+ls9xpyp. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 h 5 ,bs: bx1ep+up9eik,yal*gyours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. W(d o*+/u jk.rp lr:lbehat is the average speed of the motorist fou+k:ll.*pjd/r(o r be r this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 ippr2 8yvns/t9pw e 3-h at 100 km/h. What is her average speed for tr/2vpi3n9pt pw8- ysehe trip?

  An airplane travels at lm. ehz0bd2o9 u;gbr gq*wc2*b tq:7f 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for theq9rz*d o;u7. ebcqh*m20: tbglb2 wfg trip?

  In a 400-m relay race the anchorman (the person bke w;:rngy9 ;v rz+k: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 :kzrng e9 wb; y;k+v:rwhen 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 stop after 14 j(+d,c9a, p nf +w6mjzz+asv gs. The car's average velocity during deceleration was 59 km/h. What was the car's deceleration while slowing down,n vs+,d(6jam ++az gc pfwjz9?

  An airplane increases its speed from 100 rgu u+ hixggb vy4*, s:;/z*orm/s to 160 m/s, at the average rate of *zo/*urxg+ vibg;h , u:rysg4$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acceleratsd,ow ,nuo 761+umldaes 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 rest and axtmg y m.;d/e.yfdi90q+,nr jccelerates 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/sv(mh i w1vsu+ 5(qvmp: for 10 s. It then speeds up with a constant acceleration m :wvq5(ipv + u1h(msvof $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of rnw,+ht*r8t6:o j k8oqas: jc5.4 m/s experiences a constant acceleration of r8: hon,ctwjt *asjr o6q+:k8$4.8 \; m/s^2$. What is the cart's displacement during the first 5.0 s of its motion?

  A bullet moving hori)s 5l33fpre npzontally to the right (+x direction) with a speed of 375 m/s strikes a sandf)s5er n33lp pbag and penetrates a distance of 47.95 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraftz (1p 3bta 0pum3dg).np0 h i+9toftfc 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 lengthp p)h t+utfo1p3a00b(c zgfd3n t9.mi of the catapult?

  A car starting from rnf g.r 9d +yo/fmo0)cf(mmym7est 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 200 m. What z1xzle.,mapph9s; uy;z*2t ais its average acceler,um*; z;2p yza .pe1slxtz9 haation?

  An object starts from rest and undergoes uniform accelera+)y*misox1yao ( c1vi tion. During the first second it travels 8.7 m. How far will it tra miy) osa 1+cx(y1o*ivvel during the third second?

  An object is moving in a straight line with constant accelx*jo xyzap,43,0 p lwleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this tip 30*xyll, 4 ao,zpjxwme?

  A car starts from rest and accelerates uniformluyh /ppcz:iy57xc+,1 0f rqluy 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 cag8u1 pjo;iq ;yn 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 t0u 48vv t vwhhm fmr(;ymg/lia()7c 1qurns green, a car that has been waiting at the intersection starts a0c )f( ih mu gvr7( w1hl4ym8atm/qv;vhead 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 w+ptpb2+ jn jh.ir2o9 of 12 m/s on the surface of planet X where the acceler2p 2.nbw9o+ j i+jtprhation 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 o .th 3w*;jleghf 12 m/s on the surface of planet X where the acceleratiohtew* jl;g.3 hn 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 upiv-2 ;mlzmpi4rwtpq)3u;+q w+ pja-k8/ zsmxward with a speed of 15 m/s on the surface of planet X where the acceleration due to gravity is23v4-p8+ alqmwrmjwp)km t i i zuxq-; s;/+pz $2.5 \; m/s^2$. 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 plac1t) 3ihie (w vsc.6.ndcnd,bnet X where the acceleration due to i 1tc in6c. dw,vdesc)h(nb3.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 holyp 2smv rlzn95j5f/;naqg +0 yds a ruler between your fingers and releases it without l;rfgy5vm0s 5+zp /n 9y2jqnawarning, 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 aulh4b 1 sh wka bd.p5lt*wgh3 :9)s5gafter 3.0 pda3t5us hg.khw s5bl4wh)1*9ag: lb 0 s?

  A bullet shot straight up returns to its starting poin.5izvd 7gxtqi *) g)2 vhftsh/t in 8 s. What is the iniqt* t5 xh)sv 2digv7hz.g i)/ftial speed of the bullet?

  A ball is thrown stra 1fw(am kye,vp,cbl-; ight up with a speed of 36.0 m/s. How long does it take to return to its s,lmbf -cvw,p;1 akye (tarting point?

  A ball is thrown downward from the t )cj klu7djh7n .d)jj5jak1,iop of a building with an initial speed of 11 m/s. It strikes the ground after 2.1 s uc j1j7d, djl7 a)jkij)kh5n.. How high is the building?

  A ball is thrown straight up with a speed of 30 m/scyz -f 8 9ohf1n6 ;m1d8fptdge. (only fill in numerical value m16-thgfoypddfc;e f 1n8z89 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 straight up into the air with a speed of 21.0 m/s. mun4d7d7 fqn5oq1yl+ (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 6 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 6.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1-x vk z:33,p m.vj2l byx5z8wxpve9bt.0 s?

  In Fig. below, what is t.l s;f0 pjmz4rhe velocity at t = 2.5 s?

  In Fig. below, what is t:rp fwin/ m -+mlk(7svhe velocity at t = 4.0 s?

  In Fig. below, what is the velocit )ofp;gyaw 44hy at t = 5.5 s?

  In Fig. below, what is the averg6wa(r *si ql wff)1)hage velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity fr0t sklcl*5t4 iu23h qk(3comqom 0 to 6.0 s?

  In Fig. below, what is the ace1ueex* f/a s w,zcgzw27u4g ;celeration at 1.0 s?

  In Fig. below, what is (cgcy * (d/puethe acceleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0rujy v p55juh9*cmu r5s2n/+p s?

  In Fig. below, what is the average acceljqt8r6ckcl2 l c5+f 1oeration from 0 to 8.0 s?

  In Fig. below, what is the displacement fr-gyr em4jq4*djq5 9vu3kp-z vom 0 to 8.0 s?

Does a car speedometer measure speed, velo 2 az3 j6l/kdr:;ofl5yla bzrepc( n78city? {speed|velocity}

  An object can have a varying speed if its velocity is consl./xd iwt 30jmtant.

  The velocity of an objmhxk1*q10lh 19 vo w -v1igdofect can be negative when its acceleration is positive.

  If one object has a greater speed than a second object, the first must l q (8 4dq*i1m8 p,ron0nnqmxoen3(rkhave a greater accelerationn3d ( r0r( qekx1i*o 8qnpqn4m8olmn,.

  Two cars emerge side by side from /jr9fd9e-,,y g 44tfx z,-uq xomrlcla 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 decd54siwwewfpx/h0bh-/ t 1 :bxreases.

  A baseball player hits a foul ball straight up into the air. It leaves the mt06z u; pd8xh4cggur jo+f */bat wi;uof8p* d/ + 4 0gcmthrug6xjzth 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 object speeds up, 4 wy 1;wkipdcp8xk )h+ta,k3uwhat is happening to its acceleration, how does it change if air p+kw8 x) t,a4hw ipdkuc; ky31friction is ignored?

  As a freely falling object speeds uu.i9lj y/ , gel4a8rwup, what is happening to its acceleration, how doe 9lwe/gly4r ajuu i,8.s it change if air friction CAN NOT be ignored?

  An object that is thrown vego8gljqle* 58evf: ( q.p2x*ih fyv 7jrtically upward will return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how 5 q2fj:v.f*lvp (hijgyqx*og 7l ee88will this result be altered?

  An object can have zero velocity and nonze0nua kqn5o1 ed9tqs9jt+lx. +ro acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the same time. c d)ptmxv0;/y

  An elevator moving from twx 3qzo7wbp//he second floor to the fifth floor making no stops along the way has zero acceleration all 7w zwx3bp//oqthe time.

  A rolling ball moves fr553bp5wce fiwom $x_1=2.9 \mathrm{~cm}$ to $x_2=-8.2 \mathrm{~cm}$ during the time from $t_1=1.1 \mathrm{~s}$ to $t_2=5.1 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.5 \mathrm{~s}$ is at $x_1=3.1 \mathrm{~cm}$ and at $t_2=3.8 \mathrm{~s}$ is at $x_2=8.5 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps aroub0n9ha0w; jd wnd a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 9.5 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 linspik :4n okqj03k7l8 ie, moving 105 m away in 8.2 s. It then turns abruptly and gallops halsikp4k o j7i8kq03n :lfway back in 4.7 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 u350ugyko d*h qgz0 s-$12 \; m/s$ to $24 \; m/s$ in 4.8 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 from f 9elj(4ya)qge qes9 ,2fjs6 p$23 \; m/s$ to rest in a distance of 81 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reaoon3bzn.).ztt) 4o rz0 4ie jnch a speed of $28 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.5 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can bpcett8o*tz g *hy5;w1o)kbiy ya5* m)urst out of the blocks to essentially top speed abouhymo)k5* *)o aytwyizc t; 1*85tbepgt $10.7 \; m/s$ in the first 12.5 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 uniformly from a speed ofy/j:eyeq tb7abu :+bm p;6zw0 $19 \; m/s$ to rest in 5.55 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. x(b-;b *cuzcmg+ 8hid Assuming a deceleration of (hb*zx dci+b8c;g- mu$7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck,3q e n -rbpatw:uy1 k:y*cy+q 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 10,000-m s )lv (/pg8krhrun in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must thehl/ kpsr8)v (gn accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$