Suppose that an object travels from one point in spqd3 8g7hlc4 inace to another. Make a comparison between the displal4cdgq 783hn icement and the distance traveled.

  When is the average velocity of an object equal to the instantaneous vvtqh1 zkf3 b-wv-.+w yelocity?

  A new car manufacturer advertisel bm8r v)xnc1s)3:d pks that their car can go "from zero to sixty in 8 s". This is a descr)db : 1v nsml)kxpc83ription of

  An object moving in the +x axis experience8en5k:w 21 cr+nzf5mhdgx.zsm40 ee es an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car travh +azj86exrr.eling to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning irrzh 6j+e. 8xats acceleration.

  Suppose that a car traveling to the West (-x direction) begins 4rc2hz6h w) exto slow down as it apprxhe) 2 wc46zhroaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constanwu5vcj70r* bazp45s7geh9tw t velocity. Make a statement concerning its accel4 *rt jp a5zgwhc757subvew09eration.

  If the velocity of an object is zero, does it mean that the acceleration is 0 9dey *qdjuv8 x3g0idzero? Suqj3di 0y*gdd0 ex8u9vpport your answer with an example.

  Can an object's velocity change dd6 gzm3f-3pa *j 0zlm:* mrhsuirection when its acceleration is constant? Supmg z3rhmf s d0jal6u**: 3-zmpport your answer with an example.

  Suppose that an object is moving with constant acceleratioa7p.1oqiwx./w gxjb e v*4+xtn. Make a statement concerning its motion with respect to time..x7w jqi etgxx+o a1pv/*wb .4

  Can an object have increasing speed while its acceleration is decreasind k*koz 9zo14rgsf8* ix9gfqsvn))6zu+tts2 g? Support your9z ks9ts6f* izkxqnsod1+t28ou )g*f )4v g rz answer with an example.

  Suppose a can, after an initi2)f;s69 zeij mryxy0qal kick, moves up along a smooth hill of ice. Make a statement conceq ir9sx06yzfe;yj)m 2rning its acceleration.

  Under what condition is average velocity equal to the average of the obje aqy1wyxfmc,k9:8+y 9civa) ect's initial and final vi :avc,e9k y9 yfy1xcaq8wm+)elocity?

  Objects A and B both start at rest3b2*.m6qutg pqsj5 nb. They both accelerate at the same rate. However, objecttb5 mgqspuj.2q*63 bn 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 d-sk,tec) bu/the same rate. However, object A accelerates for twice the time as object B. What is the distance tr-utcesb ,d/)k aveled by object A compared to that of object B?

  When an object is released from redsoi-szi)-u. zm)9vq st and falls in the absence of friction, which of the following iso dq)z u)si-vzm9si- . true concerning its motion?

  When an object is released from rest and falls in the absence of fricnb; hsi84 7jnye +-s,i jvca:vtion, which of the e:sn,n-vii ;j h4s+8ba7jcvy following is true concerning its motion?

  Suppose a ball is thrown straightegn .7,p mq ; l.ak2i/)p /aycdmfjqy0 up. Make a statement about the velocity and the acceleration wheq/g dyq2 akp my0j,npfi ;m)7ac. /l.en the ball reaches the highest point.

  Suppose a ball is thrown -+ qi u6xccecb 8/l7bhstraight up. What is its acceleration just before it reaches its highesc l7bb/+x6u c8-e cihqt point?

  Suppose a ball is thrown straight up, reaches a maximum .nmd03zp4 d2euqcb 9zaq7/ dt height, then falls to itdz27q34d90unqbtzpa ./m d e cs initial height. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a zgd+wpkj(ta g3 f3j fp *2yk,+maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the2yk*t3ka fzg+jg jp ,3 wdpf+( ball is coming down.

  Suppose a ball is thrown downward in the absence of aicx6g40ghar mj nbi,*)r resistance. Make a statemmch *)6 j4ga0bgni,x rent concerning its acceleration.

  Suppose a skydiver jumps mb (ef8 9o hgq/ dxg k)l-8du(*niagy(from a high-flying plane. What is her acceleration when she sh/g(qgh xlumnid (a-ky() *9o8 b f8egde reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical sz bc6nxg65iskx+9 :s cecond ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to that zsks6x95i: b c6cxg+nof 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, ball B is fuc0js ,+2bfgk.kog1 dropped from the same building. As time0ogg kuk1.c,2bffj+ s progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, ball B is dropp/ s0 6lpuwtskqh-,j4 sed from the same building. As time progresses, the difference in their spq ,skj4lhs0u sw/ p-t6eeds

  Two objects are thrown from the tdz1kj)+ ll n2p6po.n rop of a tall building. One is thrown up, and the other is thrown down, botr+.o zdknnl1l6 pj) 2ph with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped fromc4m z2wecsa5xv9*dm 0 the top of a building. A second brick is thrown straight down from the same building. They are released at the same time. Necdc 4exv 52a smzm90w*glect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant 5afc wkh)jq:l4mn;f + non-zero velocity in the +x axis. The position ve)f4w +jnl5f;:h cmkqarsus time graph of this object is

  An object is moving with constant non-zero acceleratiot1t ud*6/ hdwkmv-v 3in in the +x axis. The posi 6 w-um1hvt /vdk3itd*tion versus time graph of this object is

  An object is moving with d :*sz86.s)ldqhbb ikconstant non-zero velocity in the +x axis. The velocity versus time :sb8*qhdds bi)lz6k . graph of this object is

  An object is moving with constant n wv,hdm/1/yhn on-zero acceleration in the +x axis. The velocity versus time graph of ty nvmhh/,d1w/his object is

  The slope of a position5 vnx ayn m:g.fqv0q98xy*g 1l versus time graph gives

  The slope of a velocigc/ 4/qa x o7.voy-io ba/rcz+ty versus time graph gives

  The area under a curve in an acc 4wxbmt t/c)ty5aht;4wzq5 1u7e v0 ageleration versus time graph gives

  The area under a curvjv arc7 kf2czm+pd+- :e in a velocity versus time graph gives

  If the position vers( 7wyh.0cym66ao+bj) 2ipke l 4bsp4s z +bxqwus time graph of an object is a horizontal line, the object x+ 6 o4pj .z) +72wshi6q (0byspkaweybcb4lmis

  If the position versus time graph of an object isqcrass*t mtmb5. 6hz;8t.d j/ a vertical line, the object is szm6arjhtbtqcs8/.t5*d; . m

  If the velocity versus time graph of an g6*doa z5 ktdc:: : qh*4s95urmlvp3h- jb tqgobject is a horizontal line, the object isorj ht -mqgc5bpu*:5: lkst6dg a3hv*z :4qd9

  If the velocity versus time graph of an object is a straight line making a 2 ;c p -7tsrpwwoil95fbb,lz9n angl7- t9f psrl9lc;wb5b,p2iwzoe of 30 degrees with the time axis, the object is

  An object moves 15.0n6qi4vgt0qa;r xp z10ov c1y, m north and then 11.0 m south. Find both the distance traveled and the magnitude of 6ti0p,rq0yx4c;q oagv n1 z1vthe displacement vector.

  A boat can move at 30 km/h in still water. h x+eaa2dgu(2 How long will it take to move 12 km upstream in a river flowing 6.0 km/h+ hax ed2gu(2a?

  55 mi/h is how many m/s? (1 mi =1/q z s0 )uw ;r9a34hmnbyczb+v tt-ty 1609 m)

  What must be your average speed in tc-t/ 8ih hw0m07zjuaorder to travel 350 km in 5.15 h?

  A runner ran the marathon (apliyfi*b +0vd+pn(r of(r( r/lproximately 42.0 km) in 2 hours and 57 min. What is /*i(v( rlf(ir0+dol n+ry pbf the average speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel jelfn wio /.:i3ke80 e400 km?

  A ly (light year) is the distanadtvlm 8u0p5b4n4cz( ov7i( ovx40pkce that light travels in one year. The speed of li x5a70nctolbvmi(dpz4uv84v(kp 4 o0 ght 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 h+ 57rejs euyeg60v *z(9secryou look to the side for 4.0 s, how far do you travel during thi 7e6r(5 9*eecv0yshzerj+sg us inattentive period?

  If you run a complete loop ar :kgqm4 f0/6/ tbou6ud+c,v:rxdpljol wsq:/ound an outdoor track (400 m), in 100 s, your average velocity o6 bm4 //:ov:+wg0cqjtxdu/,f:qlksrpudl6 is

  A polar bear starts at the North Pole. It travels 1.0wo yz:hub, q8h2 9)k ixvzomh.2i *2og km south, then 1.0 km east, then 1.0 km north, then 1.0 z2 :zohy8wom .oh2v,iqkg2b*h)u9 x i 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,j n -y7ummyqp;6am9i60p3oxuuq 7ur) then 1.0 km east, then 1.0 km nortjy n;prxuumu6mi7yo9q76 )03mu q-pa h, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles. It thl2i+ksh; en-c en starts to snow and yohn;i+l sce k-2u 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 160 km at 803wu( ; 5uq0jzzm2oqahi t)z8c km/h and 160 km at 100 km/h. What is the average speed of the motorist for th 80 i;oz wqz2(3qmz hcua)t5juis trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. Wha1wj6qd 4 3fnz e,necg2t is her average speed for 2,en6ce31j4fqdz wg n the trip?

  An airplane travels at 300 mi/h south for 2.00 h /p85b6 hk4lzoligei8lqv .9a and then at 250 mi/h north for 750 miles. What is the aver9a8l.vzh6/k eo4i b 5qli p8glage speed for the trip?

  In a 400-m relay race the anchorman (the person wd(ttcvfpyv8a / .2*ytho 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 the race, i t(c8t2*v/pvy dyf. tan order that the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop after 13 s. The car's avejjct2zx:at*l6 ua*n +(ncx-r a;i;us rage velocity during deceleration was 37 km/h. What was the car's deceleration while slowing x:6c *2;unr atux sl-*jicatn (+jza; down?

  An airplane increases ity61 f +wdupgw4s speed from 100 m/s to 160 m/s, at the average rate of u d+wfypw61g4$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelwvk0ndh;m7: x p ,2d)bv)sbl9 mf)isnerates 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 acc40jt p1(8exo bnw- t+j1erm juelerates 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 kufeg : k/3xr*10 s. It then speeds up with a constant accelerationr * gkf/xkeu3: 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 2.4 m/s experiences a constant acceleratioyz0x v;rdl j6-n of 0rlxv-6yjz; d$4.2 \; m/s^2$. What is the cart's displacement during the first 6.3 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed o v6th7-m:8y x5lrdb rtf 430 m/s strikes a sandbag and penetrates a distance of 38.21 cm. Wh5yh - 7rr8 bv:tmtxd6lat is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launq +-9 k qo2fv7stvfd81qawbc-ched from a catapult on an aircraft carrier. It reaches a speed of 42 m8-k ftv1 2qaq7cq 9o+dsv-bwf/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with;v0tq:xy2o,bjoe o(f cg))hc 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. W1xiem*. m;wn 8hnabdl84az 9b hat is its average accelera bbdh mw89ziax .en*l8;m 14nation?

  An object starts from rest and undergoes uniform acceleration. During th 2p:tzembza-6 e first s-pz2m6e a bzt:econd it travels 3.2 m. How far will it travel during the third second?

  An object is moving in a straight line with convclr 1mg9 uc608nd:j20 :fk fnczkkf-stant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is trl0f1gj082 nz 9 cfmcr :fv- :6kkukcndaveling at 10 m/s. How far does it move during this time?

  A car starts from rest and ac tz5tdn7)m-.j nd/jei celerates 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 decelerate at add e :yfvu +ng9f:2ie6bout $5.0 \; m/s^2$ 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 waiting at the i(a8e 7eyqkc37v c8qyd ntersection starts ahead with a constant accelerqek qeyy 8vcc3d8a7( 7ation 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 the surface of planeok (25yq/or+ -lijtkk t X wherk2r5k ol-j/+oqyt i k(e the acceleration 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. zd,y 5jnjm:c on the surface of planet X where the accejj:m c,yd.z5nleration 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 spem3 y/n+ fjrv c .r4o-i7ukwv6h ghvp)*ed of 15 m/s on the surface of planet X where the c3vh4w mnogvh.kiuyr p*) jv-7fr+/6 acceleration 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 upwardbhh4 ccrq :m 5y:(:2kfjmpf0k with a speed of 14 m/s on the surface of planet X where the acceleray :krfc bhp: 2(5kf:j0m mqh4ction due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than 0.10 s. If your friend hocvmhnpn0k..v+ 5w )x xlds a ruler between your fingers and releases it withwxcv n)n50+km vp.x .hout 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 is)f3ldh kazpn8s 1q7/o its velocity after 3. /7afdk)3h lqz8nos1p00 s?

  A bullet shot straight up r8maa vyav:mqffr-hc)*fr* 2 9 eturns to its starting point in 13 s. What is the initial speed of themfra vr8f*9amv :hf 2-*a ycq) bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does i4 s)uyw,a dd,)r+wkaqt take to return to its starting poiq wd,aw+dukr4a ,s) )ynt?

  A ball is thrown downward s/epi:. c 6ltknh(1cs zt7 0bjfrom the top of a building with an initial speed of 24 m/s. It strikes the ground after 6.7 s(6tis/s1ze ccj l:hpt .kb n07. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill infuide e t jsu2+6/mv)cyt/ ./u numerical value in th. )y/t2e6t isju/u fevmud +/ce 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 z j .jt:k0p.z9uoedv 8into the air with a speed of 45.0 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 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 ata9l 0u*48k qyaedtofw 0,yau2 t = 1.0 s?

  In Fig. below, what is tnpd1iaw ;( 5mjjc/ly6zito -.he velocity at t = 2.5 s?

  In Fig. below, what is tjib89vy x .,qt ;qca9the velocity at t = 4.0 s?

  In Fig. below, what iah6jrvv)7sm vi xr;k 9c0r 5yind82 h-s the velocity at t = 5.5 s?

  In Fig. below, what is;qt63 x . dxuj;3esuzf the average velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity fro/d(5esw3ga 1yg*tbd z3y j;q 4jpxejzr/9l o3 m 0 to 6.0 s?

  In Fig. below, what is the acceleraf5 4h1zv8zs o(ejwrd-tion at 1.0 s?

  In Fig. below, what is t1 1-ymrj h,sflhe acceleration at 3.0 s?

  In Fig. below, what is the avj:kku u+cwn49 erage acceleration from 0 to 5.0 s?

  In Fig. below, what is the average accele*raqb cgc7b0 gmpq -*/ration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to k2poj )2l*mzv. uev7 i8.0 s?

Does a car speedometer measure speed, velocity? {speed|velocityz9u+ ;o)twera}

  An object can have a varying speed if its veloc +qw g gsdifo.510qmvkke337d( ;rkgsity is constant.

  The velocity of an object can be negative whex( .o fvnifq/5n its acceleration is positive.

  If one object has a greater speed than a second object, the first mq8aby*2pvqsiv*84a sfe y2 .h ust have a greater accep2h8yv qq.f*4 s *i2vsebyaa8leration.

  Two cars emerge side by side from a tunnel. Car A isc::.enj+c x- gtwals - 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 accelerati:ti lg;tp 8+bgon decreases.

  A baseball player hits a foul ball strajkk*j/axzr- 7ight up into the air. It leaves the bat with a speed 7aj*-kjxrz/k 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, whav icf n.mav;k jv-p9)8t is happening to its acceleration, how does i v-c.9;pfm knj) ivva8t change if air friction is ignored?

  As a freely falling object speeds up, what isg9(p4 .8jo6p curva :ciqna u- happening to its acceleration, how does it cha96i8.qrcc n -ouvjup:g4paa( nge if air friction CAN NOT be ignored?

  An object that is thrown ver), tiad4lz.4m zh noi+tically upward will return to its original position with the same speed as it had initili z .o hm,n4z+4adit)ally if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleratihdq)2.wbx6sl 2kdp7n :kga 9 u+attrc3v t r93on at the same time.

  An object can have nonzero velocity and zero acceleration at the same tdrp (vbkqt)u1fu.a3 9ime.

  An elevator moving from the second floor to the fiftxd)9 tw4nj )dhbox1;z c4hqp vm 53nz)h floor making no stops along the way has zero acceleratnh;d )5xb)vdtxzc9j)mh4 1npwqo3z 4ion all the time.

  A rolling ball moves frol*l5 a+ jt 72m+n62o )pvnfymccqsv8lm $x_1=2.0 \mathrm{~cm}$ to $x_2=-7.0 \mathrm{~cm}$ during the time from $t_1=1.0 \mathrm{~s}$ to $t_2=5.2 \mathrm{~s}$. 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 $x_1=2.8 \mathrm{~cm}$ and at $t_2=4.2 \mathrm{~s}$ is at $x_2=8.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps- vsh)z r97w.vj0 oudk around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.7 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trainer in a straight line, moving 108;l1ucy5k *try4ros h2 m away in 12.45ty* ;y41slorukrhc8 s. It then turns abruptly and gallops halfway back in 4.8 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 fro s+ r(z1qx8nui hk(os5m $11 \; m/s$ to $23 \; m/s$ in 4.1 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 froov9 ia63c-z92adsex (n8 qi oom $18 \; m/s$ to rest in a distance of 70 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speescxa3 l0f7i v.d of $29 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.6 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top speed aboe;f uc5:gx :js.2u ) kgn*wqfmut.j2f:qgnx s : eu*w5kgmuc;) f $11.1 \; m/s$ in the first 10.3 m of the race. What is the average acceleration of this sprinter?  (数值)  $m/s^2$ and how long does it take her to reach that speed?  (数值)  $s$

  A car slows down uniformly from a speed of p9wm3b (av,pj$18 \; m/s$ to rest in 4.89 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car lea7:rvav3ovi t(w9hg3 7fjdr 0aves skid marks 92 m long on the highway. Assuming a deceleratifa v0j7vhgwor7v r :9a 3(tid3on of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trj2gb5 bpe z2qo7*bqs1uck going $25 \; m/s$ on the highway. The car’s driver looks for an opportunity to pass, guessing that his car can accelerate at $1.0 \; m/s^2$. He gauges that he has to cover the 20-m length of the truck, plus 10 m clear room at the rear of the truck and 10 m more at the front of it. In the oncoming lane, he sees a car approaching, probably also traveling at $25 \; m/s$. What is the closest distance of the approaching car that he can still sately make the attempt to pass the truck? (without hitting the approaching car).    $m$

  A runner hopes to complete the 10,000-m run in ll (stid1 lrqs j53 f a0.90)scuyex9dyess than 30.0 min. After exactly 27.0 min, therel(qjdysex.d3)9uc 1ssiyt l5 0a09fr 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?    $s$