Suppose that an object travels from one point in space to ag ;**juq m(kq6uto8om3wi l6snother. Make a comparison between the displacemen *kjqlo(om 6i8ug;6 3mwqs u*tt and the distance traveled.

  When is the average velocity of an obmrgw d.pp (jyf,q85u2 ject equal to the instantaneous velocity?

  A new car manufacturer adverted2+p ao,mb4l2.mbr z ises that their car can go "from zero to sixty in 8 s". This is a de .e r+ bmdopm2b4al2z,scription of

  An object moving in the +x axis experiences an accel+63/bqh k, 6qhbukr/* rhnar zeration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling t+fh-zjvoh r8na8/ce+ 20i p8lvfr 5sco the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concern lzv -vr0+e2a8 j/5cipfh8h s+fc8onr ing its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow dow6- ln 5/6fkwxbat czr;dw 6b0nn as it approaches a traffic light. fd;tn/ 5wb -k66 acl 6bxzrn0wMake a statement concerning its acceleration.

  Suppose that an object is moving with a constan/h h2n 4yw xf4mgcl/0gt velocity. Make a statement conc x/lc44wn / f0ghmgyh2erning its acceleration.

  If the velocity of an mb 84gvcby2il kh1k( ) 1dkg+aobject is zero, does it mean that the acceleration is zero?m c(8hiagdyb1 +vbk4)1lkgk2 Support your answer with an example.

  Can an object's velocity change direction when its acceleration is constant? Su0bdnl-0x 0-bwboj9fe wjm0v ij1 49 fypport bobjfv00 d9 mwj0lx 4y j9-10w fiben-your answer with an example.

  Suppose that an object is -s:3 5il /woiecgvm/(6k csotqubi ; :moving with constant acceleration. Make a statement cov(l :itc/ bo sw6c;q/o:3i s-ekg5m iuncerning its motion with respect to time.

  Can an object have increasing sp9sxaw oj,nd,+e8h udsjq62s0eed while its acceleration is decreasing? Support your answer with an edajou6,n+s2shx9jd s 8q0,w example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. Mmycl88ftx g8r ck3 zfn25ysm 4o2i)q8ake a statement concerning its acceleratior)z58q4f883lc xtmym8oni2 c sfyk2gn.

  Under what condition is avr/byw k)32k1(::l ob oqticc nerage velocity equal to the average of the object's initial and final veloc(2cb k1k o yn3qb:oci w/lrt):ity?

  Objects A and B both start at rest. They bok0kai-wn:lzr7coc 2 l.z: m5lth accelerate at the same rate. However,: 0nrkillo27-w.c kl:zc amz5 object A accelerates for 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 :(fbeolem0sk+( r gq65uxet85-xl nt the same rate. However, object A accelerates for twice the time as objec8x k(05 e:rl(g6t-eoftx+ eln uqb 5mst 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 tqvs4soso +vp+5t t+k- he absence of friction, which of tk4 o+q5+pt+t v-ssvo she following is true concerning its motion?

  When an object is released from rest and falls indz,mn2 w )h5qx; fx5as the absence of friction, which of the following is true co wxdxnfm )a 5z2,qh5s;ncerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocity - omy/nuly t./m sla36and the acceleration when ths ll./ 3aoym/m6-un yte ball reaches the highest point.

  Suppose a ball is thrown str vpxp,4iuti ogx71;5gaight up. What is its acceleration just before it reaches its highest 41,iti;7x u5ogxppg vpoint?

  Suppose a ball is thrown straight up, reaches a maximum hei*lt1f0y (o1,v wga zvgght, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is gayw*f(,01zt 1vg govl oing up.

  A ball is thrown straight up, reaches a maximum height, then falls to its initi*u tla(8wqbt.al height. Make a statement about the (8w*uatq.tl b direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the abs.hc/kl l 4f; e1zztq6fence of air resistance. Make a statement concerning its acceleration.lek/fclz1q46 zf;t. h

  Suppose a skydiver jumps from a high-flying pr9cj3ang b 63rlane. What is her acceleration when sa b39n6rrj3gc he she reaches terminal velocity?

  A ball is thrown vertica-v2h fsuxvjmz 4t72.f, qw,cnlly upward with 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 tujc7,zvfq2s .4,v x- f2hwt mnhat 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 c8n v8wzfp3 ik35pcf8t 2irs-. One second later, ball B is dropped from the same building. As time progresses, th i-t3 iw rpfpv8n38 cc82z5fske distance between them

  Ball A is dropped from the top of a building. One second later, ball B +5;sidt c5 h-b7lw tafis dropped from the same building. As time proga;h c7bw5fsitt +-d5lresses, the difference in their speeds

  Two objects are thrown from the top of a ttd; v2n6uvjooa o/ e(h9vt)4 wall building. One is thrown up, and the other is thrown down, both with the )oe64 ja vthudvon/ ;vw 2t9o(same initial speed. What are their speeds when they hit the street?

  A brick is dropped fr(phfarhi 3v3vk5 4ukr22gqr / om the top of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Comparik(kvuqg5 hp h2 f3r /a4v3r2re the accelerations of the two bricks.

  An object is moving with constant non-zero vxmf6l pf7u5anrr rt33wj; .rums6,+l,c ne . zelocity in the +x axis. The position ver frla z,.n+r.,wpen3umrrt 5j;6slu fx67c 3msus time graph of this object is

  An object is moving with constant non-zero acceleration 06ekcd hd5 6iuin the +x axis. The position versus time grap06c5h ddu 6keih of this object is

  An object is moving with cofjg mb:wk587b nstant non-zero velocity in the +x axis. The velocity versus time graph 5jw:8bmk7fgbof this object is

  An object is moving with constant non-zero acceleration in the +x 5dpo *kvp;z84y-y(zh sx:haa4l6qkraxis. The veloci*:zaxsdlkhzyav6;q (yp h8 k4o4- 5prty versus time graph of this object is

  The slope of a position versus time er 2q.*9jeyu*s2dz 6 shjo3i bgraph gives

  The slope of a velocity versus time graph gihge5r8jcw,to, 0t 0bgves

  The area under a curve in an acceleration veru2/, pl2tsm9fe/m3worl/wjq 1 o6uwdsus time graph gives

  The area under a curve(wn2qwru rlyd,*:ay 4 in a velocity versus time graph gives

  If the position versus time graph occg8 e/bnb; f*-gkp(er, t 4hrf an object is a horizontal line, the object is ,8khr -4cfb*; pre(eg/gcbnt

  If the position versus time graph of an object is a vertical line, the ogeu0 xx3 i ,pk x*dpvy9r6pn x,q:y)0dbject is vx)9:g0dxxy d p *kx p0n3iyp,eu6rq,

  If the velocity versus time graph of an object is a horizontal lykr22o kuw:f.q,n 7dy ine, the object is7nd: oqkfku. r ,yy2w2

  If the velocity versus time graph of an object is a straight line making an a z(w)1z pu(gzjngle of 30 dez)( wzpzg uj(1grees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both94f1cyxl * te fc,aq4pu bq3+l the distance traveled and the magnitude of the displacement eqyt f9cb lu134p*c4x+la,qf vector.

  A boat can move at 30 km/h in stia6p t0ntqh6q10 nzd5 :rd/ wkill water. How long will it take to move 12 km upstream in a river flzn/0dqk hr p6at:w0 615ndq tiowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 m)2q . .gcrpcqgx4)xm7 x

  What must be your average speed in order to travel 350 km c wiwuabeiy7-hav+ o/3/*ej 4in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hoursr281lg5v ;nrq g*w7l 5ew piki and 57 min. What i5*in w1g;l7 erlik85v2pqrw gs the average speed of the runner in m/s?

  A car travels 90 km/h b8k9 zqir6nektzp)pp5v;5 m-o;k i)s . How long does it take for it to travel 400 km?

  A ly (light year) is the distance that ligkvso*t/q5c wjm :amr.2sg r* 9ht travels in one year. The speed of l5r/ kq csswgo9m.r2:*m*javtight 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 fog apcxhyo4abku8 57 eo*3kp;:r 4.0 s, how fa ch ;e57ykbup4xog3o* :a a8kpr do you travel during this inattentive period?

  If you run a complete b nq 5tpmm(ih: s/vm1 ;vsx xeyeu1.04loop around an outdoor track (400 m), in 100 s, your average1s 1mpn x y:qi(e mu4bx0mv/;vst.e5 h velocity is

  A polar bear starts at th 17p7 9xsqzbpz1 sff*he North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 k1z1s *p hf77zpx9 qsfbm 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 tr1 w- j8klec0zr v) ,8ekkbwx:mavels 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 mi)w, k zm:8kl wbc1xe8j0k -rven. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles. .-kstelxn4cc 0ckf3:It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 h e.k4kc 0 ccfxnt-s3l:ours 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. What is the averag(xk.jhh1)zmrz lf 5p-e speed of the motorist fjzxzf-.)l hrh(k 1p5mor this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km* r* uutat7ddx) 6+*h 5zcfqby/h. What is her average spee*)drb fuy auq6*x+tt75h zdc*d for the trip?

  An airplane travels at 300 mi/h south for 2.00 h aa r*a)ov7tulzz:q1 n (nd then at 250 mi/h north for 750 miles. What 1)lo: u*(7nq zatvazris the average speed for the trip?

  In a 400-m relay race the anchorman (0yu9 c q7:luebthe 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 have when the team A runner starts the final leg of te ul:b 07qy9cuhe race, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop after 10 s.,3nm( pse( odk j,ufzkw; d:0f The car's average velocity during deceleration was 39 mz; ed(d(ponwfk s3fj u,: k,0km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed frfufkk;- )vnj1c1h(mj2uwy;i gh z g;-om 100 m/s to 160 m/s, at the average rate of (g f m ;ji un-h ;ckz)w21u;kyjv-f1hg$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/ho0y2r)-uarj.h sf/ j9woem s+ 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 accel1aj a(6s-;zzg0 i jbxberates 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 -uo5g(zarq r-8dl; ;od hfwu.bw+x l;speeds up with a constant accelerationuo-5bwxd o(; zwh-r+fqur8 .; dagll ; 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 6.3 m/s experiences a constant acceler7uz/2tewc y1.ivofb . ation ofcv1y z/ 72 owfi..betu $2.7 \; m/s^2$. What is the cart's displacement during the first 7.3 s of its motion?

  A bullet moving horizontally to tf xouzh 73wbs:dx5+j*db, w 9ahe right (+x direction) with a speed of 520 m/s strikes a sa: af xxs,wwhbb53+u7 dod*zj9ndbag and penetrates a distance of 84.79 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. Itex)5nsbpz,.tdw f eyk8; 7s /m reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming thts y5s. f,)enp bme8;zwx/d7 ke acceleration is constant, what is the length of the catapult?

  A car starting from res3+uaue0x d6b5 wvt-g+iog1obyfi (w5t 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 is iqu5 patetkx-qm1 3:7s+6) )yb xpumuats average acts-) 7xpp6axu)a 5k u t1u:+ym e3bmqqceleration?

  An object starts from rest and undergoes uniforsh(u,un)hsh86t qla1a ay: m 8m acceleration. During the first second it travels8 h(maqu at sh1) yashuln:,86 6.8 m. How far will it travel during the third second?

  An object is moving in a straight line with constao/s9 bm qntnrlw8t8(2 nt acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 1ombs2/l t t8r8qw(9nn0 m/s. How far does it move during this time?

  A car starts from rest and accelerates ukb-fc1 tttwqg5vy -/dg7; 5cfniformly 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 w(x(l (jkmhdoo6j .y) 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 ca,mo0 cq:,w5h0pqn ssc r that has been waiting at the intersection starts ahead with a constant accelerati0 qs:5chopc,,s0 nqwm on 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 t j26xfd/(hzgmv y:g+of 12 m/s on the surface of planet X where the acceleration due to gravity is gmxf( +g: 26d/jhvtzy$1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown ebuh (fk 2.osxmg;+ep85wu 1iupward with a speed of 12 m/s on the surface of planet X where bf5 +g8 wm(x iopuehesk.;21uthe 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 the surface of plane95o9vk ek9cbw t X where the acceleration due tk9eoc95 b9 wvko 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 pl/z*rb51qi m*3:w zxoiv 1bf 2w5hilsfanet X where the acceleration due to gravitym/ihf *v 51b3zbq2slo:rz15fxiw* iw 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 j94.j g-6 pfy-yzjlpt:kf5ij s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you y-j:4 .ifgzkpf 65jjjp-y lt9 catch it?

  A ball is thrown upward at a velocity of 19.6 m/s.v1,v k9i/vk6ai-bet :zo vib/ What is its velocity after 3.00 s?e:-a,i t1 ivb kvbovik //9z6v

  A bullet shot straight up retk1d :rnb97 w1-z0wmmr egpar3cr l8 j2urns to its starting point in 15 s. What is the initial speed of the bullewa 131nr kcrpz82 0bdl9rg7we r-j: mmt?

  A ball is thrown straight up with a speed of 36.0 m/s. How long doesf9wua1dt 4zswy1 .)gj it take to return d.u9jgswtw1 y a1f4)z to its starting point?

  A ball is thrown downward from the top oh- a 0l6ujus6a o7hfw do7na51f a building with an initial speed of 18 m/saouljo67nd 0w5hu- ahf61 7as . It strikes the ground after 3.8 s. How high is the building?

  A ball is thrown straight s .ie7rskjy60up with a speed of 30 m/s. (only fill in numerical value in t.0keyssi6j r7 he 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 +p n 1i-i+amhzinto the air with a speed of 34.3 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 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 vec of.f8(bfd9f locity at t = 1.0 s?

  In Fig. below, what is the velocity at t = 2.5 s?4,-ofdvm-q5 i)q7z/ lo4k qlgsh(ght

  In Fig. below, what is the vt;pd:oke,p1 e-3ah kvelocity at t = 4.0 s?

  In Fig. below, what is the velocity at87te. ;ny7bv(cca mkm t = 5.5 s?

  In Fig. below, what is the average velocit q ;t0pihrn9i*)otvz/k sx8x6y from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6.ngd6) u4 kxgtk;wa49g0 s?

  In Fig. below, what is the accelerati/.vbptod5: s nev.e1x6k rl x:zfz -6k-vi3nwon at 1.0 s?

  In Fig. below, what ishj4aqc/ e+qg,jl 2c)(/tt spm the acceleration at 3.0 s?

  In Fig. below, what is3x 3k;n9 5va)ti,n4ajv c exgg8 m2lxw the average acceleration from 0 to 5.0 s?

  In Fig. below, what is the averagelt 9 2/ adio9hur3s:htqlt5 3r acceleration from 0 to 8.0 s?

  In Fig. below, what is t+soov+n2-z2xu - dyb hhe displacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {s k (:kxpf 9bb0r,rgo-gpeed|velocity}

  An object can have a varying speed if its velocity is constj,2y80t ) ifxk0fnq vgant.

  The velocity of an object can be negative when its acceleration is m/dk/s1iz h o1positive.

  If one object has a greater speed thy l1.u dwrzr0r5-13dh n3n eatan a second object, the first must have a greater acceleratiorhe 0d1n 5rta3 lnr1-.yzdw3un.

  Two cars emerge side by side from a tunnel. Car A is traveling with a sp,r;to sy)w omj; s;b*heed 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 zd:lkqi)s2o2n p uf * l s.r+3arn/et.in speed as its acceleration decreases.

  A baseball player hits a foul bxdtwubt9 (ffnw )2 ,3aall straight up into the air. It leaves the bat with a speed oft9f b,(a u3w2xdnt)fw $120 \; km/h$. 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, h: ni*bc-iu+ g ;(pokvlow does it change if air frik:-+i n( gocbuv;* pliction is ignored?

  As a freely falling object e*sjri 9s6yq :speeds up, what is happening to its acceleration, how does it change if air friction CAN NOq*ijesr: 9y s6T be ignored?

  An object that is thrown vertically upward will return to its origiz7h pm6yx04ljo-jvcw:e a6 8tnal position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how willz 4et m:la6x- 80p owcyhjv67j this result be altered?

  An object can have zero velocity (n mkjr6doe;b 68 6jdfh hbm08and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at thexy)1 uy5kaupei9 l84i same time.

  An elevator moving from the second floor to the fifth floor makiu tlirb1a:zrs /3; cp/ng no stops along the way has zero acceleration all the1;lrzurp/ bt /3si:ca time.

  A rolling ball moves fromrd( h(ohs,9p + mq8pz(jf1xew $x_1=2.2 \mathrm{~cm}$ to $x_2=-8.8 \mathrm{~cm}$ during the time from $t_1=2.5 \mathrm{~s}$ to $t_2=5.7 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.3 \mathrm{~s}$ is at $x_1=2.5 \mathrm{~cm}$ and at $t_2=3.1 \mathrm{~s}$ is at $x_2=8.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps aroundx x;4tr+5g)r e;fae/ko(ayr k a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 9.1 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 straigh6je .:s2cq-o dvm5loat line, moving 91 m away in 12.3 s. It then turnsl .e 5avo6d:jsmocq -2 abruptly and gallops halfway back in 4.6 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 tl3hk 8pb3 isr;2ly: +.emdziom $12 \; m/s$ to $24 \; m/s$ in 5.4 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 froa 0sjy(uooz2 (m $16 \; m/s$ to rest in a distance of 84 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed of *xt*hk o:h+qv$32 \; m/s$ 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 o-+p0yzj3f,djd2wzs4oqp8c can burst out of the blocks to essentially top speed about szf jo c,oz+4j- wd2 d0pqy3p8$10.1 \; m/s$ in the first 12.2 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 fr:hvr.muu u*xm1ne6s* :5brnu n r 2+fvom a speed of $18 \; m/s$ to rest in 5.57 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 ooom( w4ze*b n-ojp h47n the highway. Assuming ao4z jhmebop 4*n(-ow7 deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trv-pw2p htl078qn x,p nuck 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 10,5q5d9 m6z v5iley4l hb000-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner 65l4h b5ldmey 5 q9ivzmust then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$