Suppose that an object travels from one point in space to another. e iw,r; 8r)5x(jk*w j)sqifi b7w4wt x Make a comparison between the displacement )i)iwe5iww7w rjx,;qb8*rk( tsfxj4 and the distance traveled.

  When is the average velocity of an object equa gb4 8; jjc6gsx8vevu,w05 kaml to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty inrta g8hm5 k6p( 8 s"m56(8 hprgtak. This is a description of

  An object moving in the +x axis experiences an acceleration of k xm((dx9xk0msd;v4 0eu q/cz$2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow down asw(bo8cfnr/uz:q i:9q it approach9worz(q /i 8qc :nuf:bes a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to t3*f+ z xanrh )vu(+sebal4 5pthe West (-x direction) begins to slow down as it approaches a traffic light. Make a stateu+4r*ae5(bx+phz af) vl3ts nment concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a statemhfdh- p9nl;n7ent concehl-d7;n9fnh prning its acceleration.

  If the velocity of anc:cb,xi ,8 mdw object is zero, does it mean that the acceleration is zero? Support your answeri, w8: dcx,cmb with an example.

  Can an object's velocity change direction y5kukv r32e;i( i jq5cz4rcor5-w+mx when its acceleration is constant? Support rezcr2u i;oky+x wkc55v3(iqmr- 54 j your answer with an example.

  Suppose that an object is moving with constant acceleration. Makvz,1 pk/t b/vc4r 0vtbxm9 -hxe a statement t ,vr-zb h vv/xkx4cm/9t1 b0pconcerning its motion with respect to time.

  Can an object have increasing sp qsa9+1e7qlb n*85+ axbonntyeed while its acceleration is decreasing? Support your bbl o nt5n1y e8+9sq+a7*naqxanswer with an example.

  Suppose a can, after an initial kick, moeu)7f6bb(umzk.jn + g x/d k(pves up along a smooth hill of ice. Make a stug j+ pf6( bd7bk(/xzumkn )e.atement concerning its acceleration.

  Under what condition is average velocity equal to t5wagdvjl*nwk8x gc9. 2;0trohe average of the object's initial and fx;.82wt* 0g vjdcg9korw na5linal velocity?

  Objects A and B both start at rest. They both acc 6( .+ cuef5vudi1oduwelerate at the same rate. However, object A accelerates for twice the time as object(ce6 iv.o5dudu u+ wf1 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 sa .;)-l55saz lwhtwcotme rate. However, object A accelerates for twice the time as object B. W- oz 5t 5al.w);tclswhhat 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 friction, fqw+v rh5w67c which of the follohf6vqrw5 wc 7+wing is true concerning its motion?

  When an object is released from rest and falls in the absence of friction,k 2 3yqz7i;)a.qeuqg i which of the following2qaqiy.q e3iz )gu7; k is true concerning its motion?

  Suppose a ball is thrown straight up. ly39e 0wlg 2 c8finsv5 Make a statement about the velocity and the acc39 g8ce0v i25lswyfnl eleration when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is it sxw5x4al *wa7bw opg9k;jf 37s acceleration just before it re7 j;g4a97p3o5fw ww xksa*b lxaches its highest point?

  Suppose a ball is thrown straight up, reaches a maximum he6)c ..rl+9aio xv mz3eigolf o:n4nrnw 9s*3sight, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is goigao3iw4lmrxn:crl n9.6) s v3os onf ze+ .*9ing up.

  A ball is thrown straight up, reaches a maximum height, then falls to its i0fpz3 vve)a:wkyzq8xcu:2 t +nitial height. Make a statema vxqcuz+3p 2t:08zw)vf e: kyent 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 t,0g. g +rov b8blb +:b5fdouwresistance. Make a statement ltb+b, bfbu5g+gdw.o 0 o8: vrconcerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her acceleratioi z9humq +ss(,n when she she reaci9s(h,mqsuz + hes terminal velocity?

  A ball is thrown vertically upward with a speen/;1endflf v7zr,v7c d v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio f 7dfv7,ezr1 ; lncv/nof the maximum 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 to1l)xp 6qj.a) 8;sny7j km quxcp of a building. One second later, ball B is droppe))j.q; k8u7pxaxscmq 1j ln6yd from the same building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second laqbyu97d m,aie3 l 9wo zp+rng)7l(q;jter, ball B is dropped from the same building. As time progresses, the difference in their speeds w 797md;nqoi jzl)y3bp 9e+gqa ,l(ur

  Two objects are thrown from the top o63lf eifwd s34 x7a:(fsxw v*df a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. Whawd fs637:swlf(3x*va 4fdxeit are their speeds when they hit the street?

  A brick is dropped from the top of a bu 7/jn:(;ltop6or jr building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two :6j r o7(nj/tpbl; urobricks.

  An object is moving with constant non-zecy/zbg+29j -g a:figx6cpx5lt,t dd)ro velocity in the +x axis. The position a,2 jfz 9/dp g+b)lxyxt-6: 5cdtciggversus time graph of this object is

  An object is moving with constant non8a4va, 5zei ht-zero acceleration in the +x axis. The position versus time45haza,t8 iev graph of this object is

  An object is moving with constant non-zeroc.ce pp8w) vy, velocity in the +x axis. The velocity versus time grapy8p,p v )wc.ech of this object is

  An object is moving with constant nocyk *;kllxb8 90z, tdrn-zero acceleration in the +x axis. The velocity ve 89rkb*lkt0c xz,yl ;drsus time graph of this object is

  The slope of a positio ss2z2cbgb09 vn versus time graph gives

  The slope of a velocity versus time graph givesx8iv b2ooj;58a, lqwq

  The area under a curve in an acceleration versus time graph givec k7dp(3ud,id s

  The area under a curve in a velocity versus +/(tmngmpm4( sbej5 e time graph gives

  If the position versus time graph of an object is a horilg6o:l) it) c,u/ 9bxzqan9u qzontal line, the object iqtc 9)q,a)ux:/ul zbonig 6l9s

  If the position versus time graph of an object is a4xrrsh 7wljoj 2: 2kj .:z2aww vertical line, the object is 2 . l js:4:7zw2oarhjwkrwx2j

  If the velocity versus time gr:c e72k4 slvita/ zr 1vzh6eb;p +x3bc3x xn8yaph of an object is a horizontal line, the object isb;ya2b8k z33h74x xiczvet+:c l6vs/n e rp1 x

  If the velocity versus time graph of an object is a straight l8 6i7ea:c; b 9ez.v pawipi)gik+qq )aine making an angle of 30 degrees with the time axis, ez q)vcai)a7bki wg ;6 8ai9ep+p:. iqthe object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distanwvd.w) / czwwn3q/n ,ice traveled and the magnitude of the w n,c.3)nqiwdw z/wv/ displacement vector.

  A boat can move at 30 km/h in still water. How long0fuew2 zd-w gx8e0r6o will it take to move 12 km upstream in a r6 o8w xeefu g0z-0d2rwiver flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 4p -u2bvspe.1xuak h* mi = 1609 m)

  What must be your average speed in order to travel 350 km in 5.15 h/8lo*m.j wm lip(rkx2 ejt)(m?

  A runner ran the marathon (approximately 42.0 km) in- -en/f -hpjaq 2 hours and 57 min. What is the average speed of thea/h-n -je-pqf runner in m/s?

  A car travels 90 km/h. Ho)tmhz)myq3c 2b 38 ygqw long does it take for it to travel 400 km?

  A ly (light year) is5my46suvr a t6dlh.h03n ks q6 the distance that light travels in one year. The speed of light is aqd kr5 6 ht63ys6unv4.ms0hl$3.00 \times 10^8 \; m/s$. 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 ntaxx)vu,lf u42 e3:g straight road and you look to the side for 4.0 s, how far do you travel during this inattentive pea f:u x4xvt,n)3 l2gueriod?

  If you run a complete loop ar6m i; vjuq psr ;gd41ef)/c4ycbmg4t 0ound an outdoor track (400 m), in 100 s, your average v4 p4 6cfy/b rq) su;4cmj ggi;d0vtm1eelocity is

  A polar bear starts at the North Pole.sv-14n+qly j q It travels 1.0 km south, then 1.0 km east, then 1.0 km nvn jqyl4+-qs 1orth, 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,73x e(zb8 phhj then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average8xbh jp73z(eh velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 mil*mj s pefu nu:u(8t6r4y0h-a les. It then starts to snow uy(4m-a86*0ulf jre:pnt hus and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 167lwke/wy 0p6col:9cv0 km at 80 km/h and 160 km at 100 km/h. What is the average speed w6cye l ol/w0:v9kc7pof the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h an5w/0i bu0jku nplyv;mrs*; tagdm4 vc207g0i d 2.0 h at 100 km/h. What is her average speed for the trip * j;idn0sg; g0 t cvaulp4/7muw5 vki00yrmb2?

  An airplane travels at 300 mi/h south for 2.00 h and m/xc*z12n. is1tlzjb;rt8gbmb g:t )then at 250 mi/h north for 750 miles. Whas m bt)g1nbzt/z:t;gicbrj*x .8 2l1mt is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m) for tquy83. yin1d xz z-2qleam A can run 100 m in 9.8 s. His rival, the anchorman for team B, can cover 100 m in 10.1 s-yznl1d z.xu 8yqqi23. What is the largest lead the team B runner can have when the team A runner starts the final leg of the race, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop after 12 s. The car's averaozial6 9un 5hf x4(cg*ge velocity during deceleration was 40 km/h. o gl* i5cunax4zf9( h6 What was the car's deceleration while slowing down?

  An airplane increases its spe3cd.3zs s8oo 5p adl+vc1 k*nyed from 100 m/s to 160 m/s, at the average rate of . ny1vs cal+ 3*d3sp5od8zok c$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerawtdoj9p9n + .s;v y*qates 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 rw1(rk)47tkq1yeq 149 byp/lx lhs ,u*vle yjuest and accelerates 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 spez5dy0g ;lkvjmfm5 *o4b q: d3aeds up with a constant acceleration of 5d z4:vk0goal*5fy3mdq j;mb $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 2.9 m/z c2j z 5dtbzwv-asb9cg5* +fte n):0ls experiences a constant acceleration ofbs*v 5e+)t :0-zczdbjg2 9a wctfz n5l $4.5 \; m/s^2$. What is the cart's displacement during the first 6.1 s of its motion?

  A bullet moving horizontqm,o vpog1;o,ally to the right (+x direction) with a speed of 585 m/s strikes a sandbag and penetrates a distance of 83.79 cm. What is the average a1mo,g oop qv,;cceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft swfm9 ydt-sv7y1p p *dm2n,2/ianrh. carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration . 1yiswny2/ s,fap*dmrth-79 vp nm2d is constant, what is the length of the catapult?

  A car starting from rest gf lq5i 1a:,zom ybxy5.c(6cvmoves 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 itsa9s r.khpd 8;;tabqm) average accelera ;mhb8;.9qtra) spkdation?

  An object starts from rest and undergoes j16 xura7 qt+brews; 9uniform acceleration. During the first second it travels 8.9 m. How far will it travel dur ;ta96jrrb7wes1+uxq ing the third second?

  An object is moving in a straight line withom5 0s76xx gg. m xv4v024 ljlvp8 tw8fiz.ghm constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does iti0m6.4xgpsxov f2mvg mxg. wlj7z88 lt4v 5h 0 move during this time?

  A car starts from reszes7kw)6q0w owq5 -v xt and accelerates 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 a dry road can decelerl we*s9k-ren.+h mo7y5)g4 cltayh+p ate at about $5.0 \; m/s^2$ when braking. Suppose a car is initially traveling at 55 mi/h.
(a.) How much time does it take the car to stop?    $s$ (only input numerical values)
(b.) What is the stopping distance?    $m$ ((only input numerical values)

  At the instant a traffic light turns green, a car that has been waitinmsr2 3ujtu7(4ng 3 elhk0 tqp)g at the intersection starts ahead mh rg sek3p)uu7qt(0tn 4 3l2jwith 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 ae hxhz k/+nqk;b;5zb2 speed of 12 m/s on the surface of planet X where the accel;hxz k bq neb2kz5+/;heration 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 surd tv,ede5r 4-cxbkj( 5face of planet X where the acceleration j4 55ked-x ( ,edvbrtcdue 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 3;/ olx70dkagq-ell 3v xguz9 15 m/s on the surface of planet X where the acce/gl -eo q7v9d;lg3xx ak03uzlleration 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 speh 0v-+4af1yd *ryaip;+jl tmred of 14 m/s on the surface of planet X where the acceleration due to gravity is hr 14dl; jyy +a-+p0i*atv rfm$3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than 0.10 s. I(9+ ygvqchd7 tf your friend holds a ruler between your fingers and releases it wih tg(9cd+v 7yqthout warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at,28 8-skdkw*ktv duus a velocity of 19.6 m/s. What is its velocity after 3.0,u *kv82wu s8d-tsdkk0 s?

  A bullet shot straight up returns to its starting point in 16 s. Wpdnrdu9 h;/wiq ,7(q zhat is the initial speed o,nw/;zqd(dih7up q 9rf the bullet?

  A ball is thrown straight up with a spee npid8jser.;,mr p71qd of 36.0 m/s. How long does it take to r7ejr 8d msn1q,ipp.;return to its starting point?

  A ball is thrown downward from the top of a building with an initpxf 1)fhxw jzs 4n*e58ial speed of 14 m/s. It strikes the ground81z*f 5 s4xp)xnhejfw after 7.4 s. How high is the building?

  A ball is thrown straig- oev0m8kzxgdg oi6l; /tjg4.ht up with a speed of 30 m/s. (only fill in numerical value in the k v;ot6 x4-o. dmezg8i0gj/lgblanks)
(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 straig5 7x6klfm p0xcht up into the air with a speed of 33.1 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 12 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 12.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at4k: ,5la+nk ln afl3yx t = 1.0 s?

  In Fig. below, what is the . zh*.vzxs zg2velocity at t = 2.5 s?

  In Fig. below, what isj/k rtv:x jp1(d-/3 tcf 97*iblpy mgp the velocity at t = 4.0 s?

  In Fig. below, what is the velocity at t =sk 4dyqy 8i;hld (. 6gdxj-ku* 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.0 s?ofz,uw6s n*0e

  In Fig. below, what is the ar3e r-*0 wublfverage velocity from 0 to 6.0 s?

  In Fig. below, what is the ( adc)w)lz ,5szx8(;tbgbk px dca2z7acceleration at 1.0 s?

  In Fig. below, what is thvz/ )f-dq5 ache acceleration at 3.0 s?

  In Fig. below, what is the average acceleration from;l n+ir ; g gv)x:vrsp78wl-ym 0 to 5.0 s?

  In Fig. below, what is the average ac0m/2ly:em ek cceleration from 0 to 8.0 s?

  In Fig. below, what is1je:/u c xprel )j81ra the displacement from 0 to 8.0 s?

Does a car speedometer mem9 9pmz;j u1qqasure speed, velocity? {speed|velocity}

  An object can have a varying o5(q d,3 i8qzde)nhwt speed if its velocity is constant.

  The velocity of an object can b dqnerlxr iic4 +addh:, )1kg)ns: )t9e negative when its acceleration is positive.

  If one object has a greater speed than a secondl nvcdo5)ph:3y w ta5lr,j145ud pt/m object, the first must have a greater accele:apcp4 j/n) dv5yowrh3 l, ld15tum 5tration.

  Two cars emerge side by u b9tjc) /(gw(- olzh;6kfpgp side from a 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 decreases.px 1a,fsw897tc xr0(z x- heod

  A baseball player hits a foul ball straight up into the air. It l-j-n ut0 q e/ z1(zots/1g2j3iuntn uweaves the bat with a spejezut i1 o- /n( snzu2j1/ t0n-tq3wuged 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, what is happeua(g3 iw lnb51-) fczening to its acceleration, howfi ea5)-(b nz ug3cl1w does it change if air friction is ignored?

  As a freely falling object speeds up, what is happening to its accelerati/:cv tsbb:m6 don, how does it change if air friction CAN NOT bdbv/::6c stmbe ignored?

  An object that is thrown vertically upward will return to its original * idhedab7+2 pposition with the same speed as it had initially if air resistance is negligible. If air resi +i*b de2pdh7astance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at the same/7.vv z)el s2ge1pnz c time.

  An object can have nonzero velocity and zero accelerh:d zutyx*v q +zv(i55ation at the same time.

  An elevator moving ft jo yhl m.hq1x ;1z4up0c.5atrom the second floor to the fifth floor making no stops along the way has zero acceleration ach0 hl xpzm.11oatuj5tq.y4;ll the time.

  A rolling ball moves frox4pw y1rk;01ufy7xx p m $x_1=2.3 \mathrm{~cm}$ to $x_2=-5.8 \mathrm{~cm}$ during the time from $t_1=1.6 \mathrm{~s}$ 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 $x_1=2.4 \mathrm{~cm}$ and at $t_2=3.3 \mathrm{~s}$ is at $x_2=8.0 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around .d85 m6ev9crhf vne 3ka quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.4 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its tj0nbg 8gh,5;i q-e f)fqi ea8nrainer in a straight line, moving 115 m away in 1efq,i igg)hnn8- fejaq80;b 52.0 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 fr8-hcs7ay*7xzu 3 zf r5:cp-jfcgqad9om $12 \; m/s$ to $24 \; m/s$ in 4.5 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 qw .:g0 rkuj7p$22 \; m/s$ to rest in a distance of 80 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a etpamzalw8ayr; x);a- v-5y.speed of $25 \; m/s$ 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 burst out wf;o3p(, a;;5hhppmpqe xz+6c ldc d,of the blocks to essentially top speed about + pd p65 opxc,z;hplca q;(h,edwm3f;$10.7 \; m/s$ in the first 14.1 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 f9q7 k2g tmkdl99ooyo -rom a speed of $16 \; m/s$ to rest in 4.89 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 jq7l6on z5cm*highway. Assuming a decelerationj*zn7q oml5c6 of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck j wel-w6f)iw8i/.no dgoing $25 \; m/s$ 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 i/qm:a+2a veqwn less than 30.0 min. After exactly 27.0 min, there are still + ma2aqwqv/: e1100 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?    $s$