Suppose that an object travels from one poi inmvma)jx v/pe452v0 nt in space to another. Make a comparison between the displacemevx/n20 miejv5vm pa4 )nt and the distance traveled.

  When is the average velocity of an object equal to the instantaneous mj eo ++/d ;: sktetyw:rs d/-pn p433tbcsf*avelocity?

  A new car manufacturer advertises thatuj;en. o mi3.qsx84: h. pf.g lh9z,dv7 fqtrm their car can go "from zero to sixty in 8 s". This is a d;hlfqd.m 3.rx8.s7,mi9 vpgu hfe4jznt: o. qescription of

  An object moving in the +x axis experiennn+6nzki08e9-jr*q h i2okt qces an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x dbuxjsmnz)3. di+-p p;irection) begins to slow down as it approaches a traffic light 3j ;sx-)pp u+ibdmz.n. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to sx kgav8 o/t4rx 1t4d4glow down as it approaches a traffic light. Mak1 tokx gx4 v44atd8g/re a statement concerning its acceleration.

  Suppose that an object is moving with a constan6ip qv*lz0y 6e-oq*ux2y isx *t velocity. Make a statement concerning its acceleration6zpqvysio *-e* y*u0xlq2i 6x.

  If the velocity of an object is zero, does it mean that uh1,ft1( zfz4mqh 5smthe acceleration is zero? Suppo,1 mtzqfsh zm1hf(54u rt your answer with an example.

  Can an object's velocity change direct0lmgoci :j2sgvd 0/i ay76h1pion when its acceleration is constant? Support yous2g0 hjo0igya 71/6pimcl v:d r answer with an example.

  Suppose that an object is moving with constant acywy8 ,(plzy gwx9j)r zxy4 ff 1q3y..i;po2dnceleration. Make a statement concernif ;,ywyw(x.xpgjq3) 1 rnz yd ifp24zo8.ly9yng its motion with respect to time.

  Can an object have increasing speep+ljswjzc6byhz+a-99 3:2xuo t,t a ld while its acceleration is decreasing? Support yo,u6aw c2a llx3j hj sp9+ozty:-9 tz+bur answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth3 6 rkx)5jbx1abm7 gzs hill of ice. Make a statement concerning its acceleratikaj7x sr65 bm bz)xg31on.

  Under what condition is average velocity equal to the average of the ob-coc /s )ok0sy z8a nn57eq1:wbnp +tnject's initial and final vel /c:e)b5s kon+nzy087qs na n- 1ocwtpocity?

  Objects A and B both start at rest. They both accelerate at the same rg;wqo +hl,d8kdu xx(2ate. However, object A accelerates for twice the tim(ugh ;28doxdk xw,+qle 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 same rate. xb.y)6 3absknlzf1q- However, object A accelerates for twice the time as object B. What is the distance traveled by o3akz. n1- )bsfy6blx qbject A compared to that of object B?

  When an object is rele0obi6f+ nzz -mased from rest and falls in the absence of friction, which of the following is true-b m6n+fz0zio concerning its motion?

  When an object is released from rest and falls in4* b3ern 0rv3w79yz i+ei4tvrdj uj9n the absence of friction, which of the fol9* 0i9 r buwyv734de 34rjne jzt+nrivlowing is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about *mum7 /j0lcx:0 ya+wyylix -lthe velocity and the acceleration when the ball rea/yiulwx -0mj7ycyl0xm : *+l aches the highest point.

  Suppose a ball is thrown xe+d wy9s5 ea+straight up. What is its acceleration just before it reaayd++xseew 5 9ches its highest point?

  Suppose a ball is thrown straig snefml 9p--ws7as0jaih , 50oht up, reaches a maximum height, then falls to its initial height. M-s0ew paj,noh s0 mf9- lasi57ake a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown stra04a va(c1e a,iv+ram./ egyhe0vhk(oight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and accelerationev4.1+ aamka( gh r0eeoi0v/cv ,(hay as the ball is coming down.

  Suppose a ball is thrown downward in the absenco/ fvtok12vh 8n4a(sc e of air resistance. Make a statement concerningv o8o/2v(knh 4catsf 1 its acceleration.

  Suppose a skydiver jumps from a high-flying planewhm :;bvdh4-b . What is her acceleration when she she reaches terminalb;h hmwdb4v -: velocity?

  A ball is thrown vertically upward with au:sxxsfb1w 3v 27ew+k 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 xs1ekb 2u+ws: wx3vf7the 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 second later, bac c0 p+0qo:6gbxw fqc2ll B is dropped from the same building. As time progresso:6bfw2cgqp0 cxq +c 0es, the distance between them

  Ball A is dropped from the top of a building. One second later, ball B ic qw4a+2 j4mqus dropped from the same building. As time a+ c2w4muqj q4progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown up, ax64ihlv*8:j;x n,r7kerx k7h p(nw+ vyrh-wbnd the other is thrown down, both with the same initial speed. What are ,4kjv i8n y+7 hrwrb7(-rlh :whx6p kx;*en xvtheir speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is throwngd xbej1;(8tfhdpwx. m-x+8i straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks-1; tx8 mi.x g( +bpdfejdhx8w.

  An object is moving with constant non-zer 0m,y i.il9gn0iq8 hhnjzp6e,xgh:*so velocity in the +x axis. The position versus time graph of this obje6 ,ys 08iq .ge* zhln giixh,m0nph:9jct is

  An object is moving with constant non-zero acceleration in the +x axis. The posi7* okzkro (cy3x4 v7nction versus time graph of thi34kc o7nyx c7r z*k(vos object is

  An object is moving with constant non-zero velocity in the +x axis. The veloc0m9/p8ncp079ph 7 wper zkzztph3ht8 ity versus time grr7ztn 3p/p9 kp0hew9 pmhcz 0htpz788aph of this object is

  An object is moving wit;akk :j2 lxaij/qe 73lh constant non-zero acceleration in the +x axis. The velocity versus time graph akq7/2 jikx3lela :j; of this object is

  The slope of a position versus gg4n*fk w,m,fvt84c t time graph gives

  The slope of a velocity versus time grabzhsa .p -wja:s )+*noph gives

  The area under a curve in9g j1 pwt(mz(b13.b giaz) jpv an acceleration versus time graph gives

  The area under a curve in a velocity versus time graph givea++ 7wpizu d843rnmt ks

  If the position versus time graph oqidi60e. i5 .mhscy5pf an object is a horizontal line, the object 6 hy. pec5.imiqsd0i5 is

  If the position versus time graph of an object is a vertical line, the objecthubapd7m0di 4/ orq )) isd7 b i 04)u)modqpr/ah

  If the velocity versus time l6f(.ubzfi- t;oujp :kyvawdx4b4+(graph of an object is a horizontal line, the object isaud;(w4 y4 l:(.kbijvz+6ox-bft ufp

  If the velocity versus time g;yr:f5w/7 8k- amnyyy t cnkj2raph of an object is a straight line making an angle of- cn r5yy:y;8may 2kjtfkn7 w/ 30 degrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m southvg a/ gmaj3xc:t;h3 m3. Find both the distance traveled and the magnitude of the displacement vectorgamhg/3ct3v3 ja: mx;.

  A boat can move at 30 km/h in still water. How long will 0 f lb5b0rw*cqit take to move 12 km upstream in a r fr*b05bqwl 0civer flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 16m4ik rbnw+s-wt d(9 )l09 m)

  What must be your average speed in order to trqy7/ol zqop4mt, 8m+tavel 350 km in 5.15 h?

  A runner ran the marathon (approx4om 8ep7n:ujk imately 42.0 km) in 2 hours and 57 min. What is the neju48:pmk7o average speed of the runner in m/s?

  A car travels 90 km/h. How long does it takei9.f c kn:bzw aml,7xi*m(9hd for it to travel 400 km?

  A ly (light year) is the distance that light travels in oyf55x /u 99mqgk fq8gqne year. The speed of lightgqk558 xyfu9gf/m9 qq 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 sde 8o j(u0lsg:traight road and you look to the side for 4.0 s, how far do you travel during this inattentive per ul:8dj e(0ogsiod?

  If you run a complete loop around an outdoor tracj1..qjlbz2+f1whp i tspirvtj j6 , 31* asgh.k (400 m), in 100 s, your average velocity is 1q,bf jp 6sja23w*phjrg1j1thl.is tizv+..

  A polar bear starts at the North Pole. It travels 1.0 km south, th +olu;dgc(s xs6c3a ,ien 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 avi u;3dx6 lac+gssoc(, erage speed?

  A polar bear starts at the North Pole. It travels(i gm,tn.i /+bb*pi1crb8 i vb 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its start1 tm,np8 rb(i.g b*i/b ii+bvcing point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at7ad 02y. e-zp +puljiq 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 hometown from pi-paqez7jl+2y u 0.dschool?

  A motorist travels 160 km at 80 km/h and 1w6rk)cilz29b 60 km at 100 km/h. What is the average spl2iz9r )6c kbweed of the motorist for this trip?

  A motorist travels for 3.0 h ae;q )-ipk n97hqioh4g t 80 km/h and 2.0 h at 100 km/h. What is her aver9 e-qih47)nk;qop hgiage speed for the trip?

  An airplane travels at 30+9leu ;m7 )j8k c 2d9tz9h cj;dhdfjzd0 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. Whafj;9 )h9zumdkd8he jzl9c dtc ;+ jd27t is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m)o7lcps5 l jjn3gfj41k* *x6dt 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 spkc7n61tj* f3jdol5l 4x*jg order that the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop afthj +w;fal 5 h1i+ gms(5dfeuwcgvu:1 ,er 11 s. The car's average velocity during deceleration was 70 km/h. What was the car's deceleration whilwmw u1g+,ic f(g1jsahf+uv5 ;5dh :lee slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at themf vwtaox2xs x- 737*y average rate of 2fomsy t37v a*-xxw7x $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the ra+ 1+5lq:fy ro u(xdjw91weqr ldz5fl (te 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 accelerateshxvf 9 :dsn.xpm.cxpg ,+17x m 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 tv(4y gs8e d bj1k6yn7bhen speeds up with a constant accelerationv6bbejg4ksy8y 7 1(d 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 4.8 m/s experiences a constant accelerati o ftkre:qm 8/z4l7/nron o/ot8f :7rnzr mq/l4ekf $1.1 \; m/s^2$. What is the cart's displacement during the first 8.5 s of its motion?

  A bullet moving horinq6wi++3cl ey-vp j)1dmh *w ozontally to the right (+x direction) with a speed of 580 m/s strikes a sandbagjl -e) y n3pmvowq61c ++*hdiw and penetrates a distance of 65.16 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 carrier. It )kku(7lqf p59 vz.sen 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 length 5lsne9.p kkuz)v 7f(q of the catapult?

  A car starting from rest moves with constant acc .( ytzmby2n:celeration 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 o m)o g9uumqjd/lcao*. z6f/2 nf 200 m. What is its average accelu2jm/ q/ac9* f) 6o.mngld zoueration?

  An object starts from rest and undergoes uniform acceleratioyo:1hnfk)xm0 7uqz: 2*ceftxn. During the first second it travels 7.4 m. How far will it travel duringx)h n :t eqo2f7uk:zcfmyx*10 the third second?

  An object is moving in a straight line with constant acceleration. Initirgk5/7n .bq.figx.ec.d+ai bally it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it moqbcd.g kfa r+7ni.5.e./ig xbve during this time?

  A car starts from rest and accep:ik /08 auj jwamk.+plerates 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 shc 3yt u0pu8k3jl*,ua dry road can 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 tradx r)ka(s)e7:; hugm wffic light turns green, a car that has been waiting at the intersection starts ahe)d( k)ur xw7g:ma; shead 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 th;vzi -vuzv -x3e surface of planet X where the acc vzv-3vxzu-i; 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 of76n f dxsepn )84.upth qj*5b:sb.qb q planet X where the acceleration due to gra*b )t7nbqfqxndjpe6p5ub 4h s q:8.s .vity 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 speedchtgl--0x:gqv g r .s* of 15 m/s on the surface of planet X where the acce-x.:qrv* 0-gglg s hctleration 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 on the surface of planet X zu u8 3 dd0rwp9urh-+f/gqn6r where the acceleration du df0u9/g uqz8r+6wn rdu pr-h3e to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usuacqz,n6*2 x-tio0 y9 vvwubak /lly greater than 0.10 s. If your friend holds a ruler between your fingers tzo u96x0wqi-/b a2c* ,vn kyvand 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 m/s. What io muff7k9gf- fb0 h8dda: 3bc0s its velocity after 3.00 s? fh uc-k:m d803aob 9f7ff0gdb

  A bullet shot straight up returns to its starting point i02u/yyc aslm7n 7 s. What is the initiyc/2lsa 70umyal speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it take b n rxz.hd6hxjko-(7 t x/a5e0to return to its rx.nx/zeh0axj7ot-b5k d6 (h starting point?

  A ball is thrown downward from the top of a building with an initial speet6 qr9m-dh7nap(7fqb d of 24 m/s. It str97dam rqntp-fb7( 6hqikes the ground after 1.4 s. How high is the building?

  A ball is thrown straight u:pfje7 .;-lh g ec;rhejx-xo)p with a speed of 30 m/s. (only fill in numerical valx eh )op;x -l:e- h7rgj;j.cfeue 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 thewychv-s3v 1 jlo)j/+w air with a speed of 30.4 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 11 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 11.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is them/ajlc o1oz,udife.0 ,jww:81 o b ma) velocity at t = 1.0 s?

  In Fig. below, what is the velocity at t = 2.h rc2y-mom ox whq*-:65 s?

  In Fig. below, what is the velocity at t = 4.0 s,/alk) yo4wt-y-mtkl0b na 4i ?

  In Fig. below, what is the velocity at t = 5.5 s?cu;z*w 9d a2o5 (uvxzv

  In Fig. below, what is the av j-ctly,1bv)r le- he-erage velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocivpkg )p27c. o;dtv/mi)1,n mm9wtn xnty from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 s?zzvs )s 2kdblt/wh8, ;

  In Fig. below, what is the acceleration at 3.0 :wpc( +e9peu q5ii ch*s?

  In Fig. below, what isp8jh5 xp )ve/.2ei u2fys:,8s zqamv k the average acceleration from 0 to 5.0 s?

  In Fig. below, what is tcfpj x:x a3rr/s,q:x 79cq:bthe average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacementvrit85 y ql) o;eq:w5b+r2 jmf from 0 to 8.0 s?

Does a car speedometer measureiu8f. x cotaq8h )0frvi88/j t speed, velocity? {speed|velocity}

  An object can have a k a1+0 xnrua*zvarying speed if its velocity is constant.

  The velocity of an object can be negativ:ob1lzeqs1zu:b)9 b ul hg:,wvt o ,b7e when its acceleration is positive.

  If one object has a greater speed than a second object, the first mus y(mbjt,5 +db-wd 9vbs2 3mllct have a greatb,jsv5 (bc mdy9 -tl l2m+d3bwer acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling with ajc9so06mefwe- nzkks , 2b/m- in3lr/z7s1 lf 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 acceleratiee.v *e0vn3yh4 /5a,gc ,xzxt3o xm tion decreases.

  A baseball player hits a foul ball straight up jmo4e)ulm v g 62+m0kyinto the air. It leaves the bat with a speed o6 4jyokv+2u mme l0gm)f $120 \; km/h$. 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 happenintk8q7r (q khx65(b hxmt lt-d4g to its acceleration, how does it chktxt7hrl x 46bh(t-k8 dqq5( mange if air friction is ignored?

  As a freely falling object speeds up, what is happening t8. 7j/ghvezg*dgnoug,2 hb1ko its acceleration, how does it change if air frictidj nugv gg*hoz k1.2b/ ,hg87eon CAN NOT be ignored?

  An object that is thrown vertica:6 z6uk8 q o2rq ;pfjin.sxd7rlly 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 will this result be altered?fnqp;z2:8ru irs x 6kjq7o. d6

  An object can have zero velocity and nonzero acceleration at the jm7d (u,jn5;4h e wyh5jwy g)gsame time.

  An object can have nonzero velocity and zero acceleratio3lrk9 pol1m lb1+mgtdp+4k7dn at the same time.

  An elevator moving from the secon (t c-)t(fs/rlo t8w4( bk:/anqqtjldd floor to the fifth floor making no stops along the way has zero acc4/ldttrc (-(qw:n 8/k tl to sf(qajb)eleration all the time.

  A rolling ball moves fromac6wp(i 5 r7ekp8i v+v $x_1=1.8 \mathrm{~cm}$ to $x_2=-5.0 \mathrm{~cm}$ during the time from $t_1=2.8 \mathrm{~s}$ 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 $t_1=-3.1 \mathrm{~s}$ is at $x_1=3.0 \mathrm{~cm}$ and at $t_2=4.3 \mathrm{~s}$ 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 qua6s4+yr- mb50pbqb vlsl-d y,crter-mile ($1 \; mile = 1609 \; m$) track in a total time of 12.1 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away )m rcg2y/gu-efrom its trainer in a straight line, moving 103 m away in 8e ymg2- c)/urg.7 s. It then turns 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 fr/arn*lhy9l+k./nb q vom $10 \; m/s$ to $22 \; m/s$ in 5.5 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 e(fs2q0ag bjlxe 8d31 $17 \; m/s$ to rest in a distance of 56 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed of o.))y orr5g5+xha5ds 5pmt3d vs.jad$33 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.9 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to eskgcyfp8e*c36/ f7r0/c ovaepsentially top speed abou akccg/*07fpy8 p3/v f oere6ct $10.9 \; m/s$ in the first 13.4 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 uniformly from a b.a4waqu;;ne speed of $15 \; m/s$ to rest in 5.23 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 hi; ) xffeq7iu(knlu+a6qoem6f1-iub ,ghway. Assuming a deceleratlf-e,en1 ba67 qk+6 fomiif)qxuuu(;ion of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goi-u3-s;tg dydi ) z3 ;ufkvlyt/ng $25 \; m/s$ 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 complt gdu7fjfsj 0)v 1u)n9ete the 10,000-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The sv9fjt )0judn1 f 7g)urunner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$