Suppose that an object travels from one point in spaco:r,zly3n u0 me to another. Make a comparison between the displacement and the distance trzmu0r:on ,y l3aveled.

  When is the average velocity of an object equal to the instantaneous v/b,zdd id.0 tzelocity?

  A new car manufacturer y*hw8g66 h(nnz0pfs en5n e *madvertises that their car can go "from zero to sixty in 8 s". Thpgz6e (5ymh * e h0f8*nnnn6wsis is a description of

  An object moving in the +x axi; (5 zewhcmv-e 3t(w *pxkrhe1s experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling t0/w9 wzbr 1ize/*cui bo the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concewciz b*r/0be1 i9u/zw rning its acceleration.

  Suppose that a car traveling to thg *5c/ ejma2)hwprik/ e West (-x direction) begins to slow down as it appr/pwkh/e amc 5i)*j gr2oaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a cokfb , 1u5xlpdetm36n 0nstant velocity. Make a statement concerning its,d emlp f650k b1xut3n acceleration.

  If the velocity of an object is zero, does it mean th:rtonryz 57 -kpioa4kzn b1 0:at the acceleration is zero?yi t:n k :kr1 o754zoap-bnr0z Support your answer with an example.

  Can an object's velocity change direction when its acceleration is constant?l;j5 ,llakl*b Support your answer withblllj ;kl a,*5 an example.

  Suppose that an object is moving with constant acceleration. q b: m03bbzon3Make a statement concerning its motion with respect to z0 b 3bn3q:mbotime.

  Can an object have increasing speed while ij,pb,7u1b. nxr oli t9(1sy ekvfr70 rts acceleration is decreasing? Support your answefy,9, 7nxeri j(tr b bvslr .1u7ok1p0r with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ( b:ypstl l1z)a3;jwv ice. Make a statement con1v;ltz ys: jl)3paw(b cerning its acceleration.

  Under what condition is average velocity equal to the average ofp:0n5wnsobkks o7jlc32 --a y the object's initial and fi2b nlwk - oayo0j kn-57s:spc3nal velocity?

  Objects A and B both start at rest. They both ac inok5wu:rm5q,8 m rv0celerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A5 wu,5 rm nmirvq08ko: compared to that of object B?

  Objects A and B both start from rest. ; f m(:hiwl7cmo 21p-l bix3xtThey both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that mpl3b2ci -o; 71x imf:hxlt w(of object B?

  When an object is released from rest and falls in theknn2. j9 z,msn(mauv2g0p,5yb -xswuj h)ft+ absence of friction, which of the following is truj29(.ynxwn)f n0bzm 2 5k u,jtg+a,-vhsu mp se concerning its motion?

  When an object is released from rest and falls in the absence of friction, w. b51cukqvvu,hich of the following is truv.vkq1buu 5c, e concerning its motion?

  Suppose a ball is thrown straight upxi-z.7a,v/ /t vwylza. Make a statement about the velocity and the acceleration when the ba x/aaz/.7 ivzyl,wvt-ll reaches the highest point.

  Suppose a ball is thrown oxs7gaxw .db d b80;8tstraight up. What is its acceleration just before it r.d7s8 xb axo 8tw0g;bdeaches its highest point?

  Suppose a ball is thrownf)ru.np,a8:6xsfpb - pm0czj straight up, reaches a maximum height, then falls to its initial height. Make a statement about) :sb ,pu0pm-8xpzacfr .fj 6n the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls too7eyg*h .59i1p g kjjp its initial height. Make a statement about the direction of the velocity and acceleratip.p7 k*5g9j o1hi yejgon as the ball is coming down.

  Suppose a ball is thrown downward in the hl,dbm xpjh5;zk7w. nv8r3jm7w pg5 gv:;*i jabsence of air resistance. Make a statement co gvl5wbv d;ip57gm wjkh3 :*zx8pj; rnj7hm,.ncerning its acceleration.

  Suppose a skydiver jumps from a high-flying pl *oxjsn26 .dii-bg3)g(a wxvsane. What is her acceleration when she she reaches terminal vei. o3)wxdgi*-b6av2nsgj( xslocity?

  A ball is thrown vertically upward with a speed v. An identical second ball is bw;6qemi-w+u(i- vm t py6 7lzthrown 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?(imp; -wu6q-7i meltv+ z6wy b (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 Bq1kak5- +x b18ti qbsb is dropped from the same building. As time progre1sa-q tkb i8xbb1+q5ksses, the distance between them

  Ball A is dropped from the top )r) xvcm2hpm5of a building. One second later, ball B is dropped from the same building. x2 hmpm)v)5 rc As time progresses, the difference in their speeds

  Two objects are thrown from the top of a z*p 3hnp9ztn7tems35 w n7 4cmtall building. One is thrown up, and the other is thrown down, both with the sz p n 3whstezcn497m53t7n p*mame initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is thr0.x/cerf0ih- ahz2z(nuco/ com;-j rown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the tw -2h.;n rejo0u/mhozcxr / (0acifz-co bricks.

  An object is moving with constant non-zero velocity in the +x axis)wg2u sf:rk4 r. The position versus time graph of thik s) rg:ru2w4fs object is

  An object is moving with constant non-zero acceleration in the +v,addkmq+2fan 1+a3m ng 6;zox axis. The position versus time graph of this object isnnmf;qd2 od6k,++v az agma13

  An object is moving withf8j0c7k9dk q rr0.vd f constant non-zero velocity in the +x axis. The velocity versus time graph of this objeqk 9kdc07fr jrf 08dv.ct is

  An object is moving with constant non-zero acceleration in the tpia9 (1f)d mit0 nj 8ycfzm)6+x axis. The velocity versus time graph of 1m6i(fdjyt) ztmf ca8 )0pni9 this object is

  The slope of a position versus tim8o/fq.oy + k 1qm)wmc( ktyj8oe graph gives

  The slope of a velocity-ja jh tb:gc/hf )n5d8 versus time graph gives

  The area under a curve in an acceleration v-+ jqsa)nm5+; ikyszx l2r:ftersus time graph gives

  The area under a curve in a veloci x1pgaffwfv- 2t0 7,oxty versus time graph gives

  If the position versus 3 j uhqlc(qp8.x,s0tatime graph of an object is a horizontal line, the object ial q sqput0(,8j3h. xcs

  If the position versus time graph of an oh/ ,qb/:nyfl1fyq g(sbject is a vertical line, the object isy(/1/g,q:yqn ffslhb

  If the velocity versus time g*7ae qcdr. .qmh4uf n.raph of an object is a horizontal line, the object isqc.n.d* f7e4 a u.rhqm

  If the velocity versus ti8ms ax3r.5qpu- 8tthlme graph of an object is a straight line making an angle of 30 degrees x5s-t 8 r83tmql.hau pwith the time axis, the object is

  An object moves 15.0 m north and then 11.0 m sout6m 95 + rlpq .w7l4hgkzd4rwigpgnj:7h. Find both the distance traveled and the magnitude of the mll g:+ .n qpkpidz757rhwrgwj944g6 displacement vector.

  A boat can move at 30 km/h in s ;m73kos8qh 6,it. if +,idr3wu lhdtgtill water. How long will it take to move 12 km upstream il7h836ttq,fwumi,i g.r+dsh kd;o 3 in a river flowing 6.0 km/h?

  55 mi/h is how many m/fbwmb pbu;v .c*yc/c.9cn4o*m +n u+bs? (1 mi = 1609 m)

  What must be your average speed in order to travel 3yp - x32zxpioe.c-zn-50 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57gxacvu6uvg k(6 t )+f- min. What is the average speed of tt6 +a (g)v-uufxgvc 6khe runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel 4003r+,sm i xap:j km?

  A ly (light year) is the distance that light travels in one year. The sp s5qgl.gxyf2c41 ;cw8qqu i)qeed of s fq8 y 5q.;x w2cggq4q1c)luilight 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 road and you look to the side for *ksh29 ie+-, .puk sjcy7rcdmy pk:;d 4.0 s, how far do you travel during yj;,ckp9uh * d7ry m: sdps+ki2k-ec .this inattentive period?

  If you run a complete loop around an outdoor track (400 m),. osky qi54 0zt*ayo,m in 100 s, your average v i t,ooz.0qka4ym 5*syelocity is

  A polar bear starts at the North Pole. It travels 1vrdtm m(uz )r*ls1 j0/.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 kz(s)1 d0rmuj lr *m/tvm 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.1 :ez :7kaiyrx -:nq j5r,(:ws ujgbsv 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.-5q : 1wjg7 abj(x,k:sv ei: znsrur:y What was the bear's average velocity?

  You are driving home on a weekend from school a+s6v*jk 6 za:xl vcleq+h( hi9t 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 15 minutes. How far is your hometowlzxvl hh :e(k+6+j*avs6q 9cin from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. tf*mgk,snl (5,f0ux*) ql ; kl uehfe; What is the average speed of the motorist for t;el5,th0)uk ,x; fgl*f*qlm ns fek(uhis trip?

  A motorist travels for 3.0 h at 80 km/h and o-d0)-xsw twz 2.0 h at 100 km/h. What is her average speed for the-wo)sd w0x- tz trip?

  An airplane travels at 300 mi/h south for 2.00 h and then ma4m;b m/krc-4htj blv /rv/u/wwq )9 at 250 mi/h north for 750 miles. Wt4w9uqwv;mrrh k//jlm)bmab 4 //cv-hat is the average speed for the trip?

  In a 400-m relay race the anlo7ivp5yjt1-e,p + ufb16l mochorman (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 hav-,poivbop et+1 6 mulf7yl5j1e 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 stop after 9 s. Thx e94vl0v crdmh;v f5r+*8 fuu7r :moue car's average velocity during deceleration was 37 km/h. What was the car's decelerat+v*r u9fm r 4uh vcxl0dmvf;7re5 o:u8ion while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average 8p ;o xea8ip452aauvvrate of 42au e; vvop5 ip8aa8x$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h1 zgyus/(es 6e accelerates 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 ac qy0dv2f;5fgvhi(q,q3s8qb p celerates 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 constantjcis0h o ,xd23/ x9,ggdm tmg/ acceleration oigg 2xmt0/, hd jod93mg /cx,sf $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velgepayik2gv )* i6+3hrocity of 4.6 m/s experiences a constant acceleration og2y3*a6 +rkgih pvei )f $3.4 \; m/s^2$. What is the cart's displacement during the first 9.9 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a .b; c/mwg+lv ur1 bd8mpoc(j:o ws8e)speed of 370 m/s strikes a sandbag and penetrates a distance of 57.05 cm. What is the omv/up;j.b(e)b lwm 1:dr8c sow+cg8average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult ,7as n q9ipu3don 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, wq, 9 pd3ni7sauhat is the length of the catapult?

  A car starting from rest mov7lv zn mw/vz 8c.9(lc6jych2 wes 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 of6,mz y0.tva byd 9/etc 200 m. What is its average acceleratio t,tay6db/mve9 c.0y zn?

  An object starts from rest and undergoes uniform acceleration. During the ;eqw wb; u/xa0i 9*8htx:pvmt first second it travels 3.2 m. How far will it travel durin8 * ;ux h wvxwpt/t0me;9iab:qg the third second?

  An object is moving in a straight line with constant accele6 uggr/u6(jtv,tvf ,lration. Initially it is tragu j,vfrl6 g/ 6t,uvt(veling 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 ef0 z e;plk1 j6v79k5)aiurw0j(uxq4-j l jiouniformly 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 about m3xgygv( -me/$5.0 \; m/s^2$ 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 has been waitiny8hgw,x (4jjw,qsi4b g at the intersection st4 jwb, s,i8q(hj yxgw4arts ahead 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 of 12 m/s on t m l9hym-eh0x)a5 ,ap4qz pmq3he surface of planet X where the acceleration due to gravity is hlx-93maqe p,4hqmp z ym0a5)$1.5 \; m/s^2$. 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 planet5hvvkj9wwew ,p4b)y8 X whevh4 pw)byjvw59,w e8k re 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 a speed of 15 m/s on them9eump21gg o ,8fn86v foqt6y surface of planet X where the acceleration due to gravity isogfvq n to,mep6188fg2 9mu6y $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

  An object is thrown upward wi/so/itgb.c qj3r fx 7pj y8.5wth a speed of 14 m/s on the surface of planet X where the acce .cwj 38.xgqpjr5o/bf ys7t/ileration due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is ush/sk5 e ht*fi7yuj0k c,l2 p7 xfj+/)hdpg1m uually greater than 0.10 s. If your friend holds a ruler between your fingers and js)k*f7j51p p emt2l/fc/h7+uxdy, hig k uh0releases 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 m/s. c5rdzk* iem v /j9 ):,bqh.uqd What is its velocity after 3.00 k : hj, izu./vrq)5qe*bmc9dd s?

  A bullet shot straight up returns to its starting point in 18 s. Whf,3pa+m 8s 4nkzl, tkkat is the initial speed of the bulkn,3st,l+8kmazf k4 plet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it /j3l2 w,iuxqmyu.jq/4yyv)g4bpmj iy*-9i rtake to return to its st2) qwpr*iujgbiyiyj4v. /-q3jum/yy9 4xm , larting point?

  A ball is thrown downward from th tl 7p/t* zrnbeo763,e3bnjtye top of a building with an initial speed of 28 m/s. It strikes the grb,3/776 bzennety*ol t3r jtp ound after 1.9 s. How high is the building?

  A ball is thrown str:uatvy rbu /b(*p-bx:aight up with a speed of 30 m/s. (only fill in numerical value in the /:v bt-ya x:pu(ubrb*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 a9pz;xr6 :d x-, v/w*n pr6 pkay:swaqhir with a speed of 23.6 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 3 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 10 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 10.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the tv 4(zo8imvg 7velocity at t = 1.0 s?

  In Fig. below, what iols*0ag( 2r tlu.brc -s the velocity at t = 2.5 s?

  In Fig. below, what is the velocity doef:qt m(89 oat t = 4.0 s?

  In Fig. below, what is the velocity at t = 5davk ;ja7-aqk6r xwib+nx26+ .5 s?

  In Fig. below, what is the a;agc8b a: 4wniverage velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6.0lzi7v1bva83+h yl ;p w s?

  In Fig. below, what is6pqfm3a*hib + the acceleration at 1.0 s?

  In Fig. below, what itcgytudx t p-y ),qn8.u9+r)79ckgj r s the acceleration at 3.0 s?

  In Fig. below, what is the average acceleration frc11vw*1ua g y k4f;cr7 uvako,om 0 to 5.0 s?

  In Fig. below, what is the average1 yzjfjtf(g d(x-w5q zqk:;4u acceleration from 0 to 8.0 s?

  In Fig. below, what is the displa6fsfr l5q:h:n mr6/efcement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {spe km-qcrvsj9db9k,* x44j1a,gst: er sed|velocity}

  An object can have a vaf ww f qwjyjkxu6jh4,6 *x0on6a04c,ct2 ze7erying speed if its velocity is constant.

  The velocity of an object/ptm gj *vy:qp 3.,is o+m+7zjtj 3bic can be negative when its acceleration is positive.

  If one object has a greater speed than a second object, the first must haveg8cq4+ /k6yzt)qsda j a greater accelt86q/y)+adkcgzj 4q seration.

  Two cars emerge side by side from a tunnel. Car A il agsfuo1y0,rp,i 56 fs 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 acceleration3zihv2o0fja s* 8*zii decreases.

  A baseball player hits a foul ball straight mkww8mh .:c88g.hr va up into the air. It leaves the bat with a ac:hmg mhk v..88 wwr8speed 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: uks fznzgi :zj )by5 :*veu9))fxyk- speeds up, what is happening to its acceleration, how does it change if air fric9 vegsz*)5 zyji:z ):unx:ku-)ff kbytion is ignored?

  As a freely falling object speeds up, what is hap- s/ieu ,w u:avcz;: i8e6crs.dg+eey pening to its acceleration, how does it change if air frictcr8yec:+w: d/si6,g;ue-v za.s uie e ion CAN NOT be ignored?

  An object that is thrown vertically hc 1)s(dr .t lxw8ngr0upward will return to its original position with the same speed as it had insthgn(. r) w8rd0 cxl1itially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzerope832do7gojs acceleration at the same time.

  An object can have nonaemydmda0zskq x79v4,jahv 4o wnui5:4 2 a19zero velocity and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth lxnnsnx3)82tz7q zbwh(rq;5floor making no stops along tx n b2q87 3szt5lnw;qx)hnzr(he way has zero acceleration all the time.

  A rolling ball moves frof fsimx7k)jj +69w:(v ihrf o:m $x_1=1.8 \mathrm{~cm}$ to $x_2=-4.9 \mathrm{~cm}$ during the time from $t_1=2.2 \mathrm{~s}$ to $t_2=5.3 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.7 \mathrm{~s}$ is at $x_1=2.9 \mathrm{~cm}$ and at $t_2=3.4 \mathrm{~s}$ is at $x_2=8.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a; cs)6b oaf*vh quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.5 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 str r;jhcf*x ey-5aight line, moving 96 m away in 10.7 s. It then turje*fyxc r-5h; ns abruptly and gallops halfway 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 .+2 x5g.wq1qqjp w dxx$13 \; m/s$ to $23 \; m/s$ in 4.9 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 fsylg5(t. s uwo2 xju) 6u-u3z$16 \; m/s$ to rest in a distance of 73 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must re(c+4gb bn x(rv7 6bh,quno9weach a speed of $32 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $3.0 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter o+mzybmz ;czlygq 8 -*t0q *q:can burst out of the blocks to essentially top speed abou:;+ly** g zzoq0bqc mq8-tymzt $10.1 \; m/s$ in the first 12.4 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 uniformlc1-d x, ny7(kirk ey(zy from a speed of $18 \; m/s$ to rest in 4.78 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 t j(bdu9r5gc s5tsn *c;he highway. Assuming a d5 bu g(5*ntsd9c;scrjeceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going 68eg3eb b5fbi $25 \; m/s$ 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+ w+o0pxcay 0m5c.al f than 30.0 min. After exactly 27.0 x0a.0 aomcf++l cy5w pmin, 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?    $s$