Suppose that an object travels from one poinl4un6vi7af g12j ob3 at in space to another. Make a comparison i g bljfa74n13ouv a62between the displacement and the distance traveled.

  When is the average vxq *v/ 297wcxy-fscp;/ob8mmz1 b wyvelocity of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty in b4te6sby-6gq fk2 2;l8sj hv2q 6qay c8 s". This is a description 6cj-2;hyb q46k286elqqag byt ss2 vfof

  An object moving in the +x axis experienc;,5n :xg;;rp jx lq2:rqxperdes an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins tob+.0ufpcdij jgg 5.w (kbp4 u( slow down as it approaches a traffic light. Make .i.5+kwbpc(f u pbjg0 gduj4(a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins toglbj+hao5g tzxj b.q-d5 uu q2 :695zj slow down as it approaches a traffic light. Make a statement conc 5jg9z2+th-gjbd5.6lq5q oazj:uub xerning its acceleration.

  Suppose that an object is moving with a constant velocity.c5);gm,hfn ws 3:ksh z Make a statement concerning its acs5,n;:3whscf gz ) kmhceleration.

  If the velocity of an objea ewy-d192t iakym3j8 ct is zero, does it mean that the acceleration is zero? a1kdym-2t yw83jai9e Support your answer with an example.

  Can an object's velocitxj.kr w6f84ng y change direction when its acceleration is constant? Supportf8ng6r .x kw4j your answer with an example.

  Suppose that an object is moving with constanufr7 br:l yue)g3772c9rwoxst acceleration. Make a statement concern7wlx2uofr: ur9yrb) ec7 3sg 7ing its motion with respect to time.

  Can an object have increasing speed while its acceleration is decreasing?/6rvlz- ;nwa vmmwq )l.*u za4 Support your answer w lqmavunl) 6*zw/zrm 4w.; v-aith an example.

  Suppose a can, after an initial kick, moves up along a smooth hif*z)q)3abu ,qz+knbd ll of ice. Make a statement concerning its ac* qazuq)b+knf3z d b),celeration.

  Under what condition is average velocity equal tood0h/;8w-mm( agm wrl the average of the object's initial and final velocityr-mmm 0/(alhd 8wow; g?

  Objects A and B both s88wnw7;x rp* n4mjrwetart at rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to wr *4xnw pemr8w8;j7nthat of object B?

  Objects A and B both start from rest. They both accelerate at the same ra (ylewnhif49, te. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of object B? 4ef9il(hwn,y

  When an object is released from rest and falls ion x 1ywiw2)-qn the absence of friction, which of the following is true conce w-2 )wiyxqo1nrning its motion?

  When an object is released from rest and falls in the absenc k4hg wa pp/imc9oyy .g to-*q4:7mpv-e of friction, which of the followingp oaq 4py.iwg-v- c79o:t/ pmhm4 gk*y is true concerning its motion?

  Suppose a ball is thrown straight up. Make am( ws cay1/q3 1cacml: statement about the velocity and tys1:/( caac wmq1cl3mhe acceleration when the ball reaches the highest point.

  Suppose a ball is thrown 0zsr- y89bheeq)5 ksv straight up. What is its acceleration just before it reaches its he8 -s)0kzs ry9hqve5 bighest point?

  Suppose a ball is thrown straight up, reaches a maximum height, then falls geo /fdpl61i) to its initial height. Makeo 6lg)/1pidf e a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a myqirqso/j84+l, :cis5in 8bi aximum height, then falls to its initial height. Make arisj 5 nis8o/, i:y8q +iq4clb statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown d+xmq6 f96a dd.guaoy-q4d3ii ownward in the absence of air resistance. Make a state9 qiy 3-d 6 +gad6du.fxiqoa4mment concerning its acceleration.

  Suppose a skydiver jumps from a high-flying planeszk,( +y 8ke: adw :zeps17ote. What is her acceleration when she she reaches termzoa:p+s 1tesey dkw 7(8z k:,einal velocity?

  A ball is thrown vertically upward with a speed v. An identical,lh,*dt cx5 ;hj4/jxbf:seqr second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximj,fd:r; 5 b ex/ht4 chq*,jsxlum 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 top of a building. One k9 lnali-mm p76ck83i second later, ball B is dropped from the same building. As time progresses, the distance bel a3 879iikm-c 6mpnkltween them

  Ball A is dropped from the top of a building. One second later, ball B im7 *),ydj4lc p2i, zvwb2 .jje8ijhiss dropped from thh8w 7,ij,mv)2 ypj4jezjd.c2li *i s be same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. Onjlacw7)iz 79o ddu-2re is thrown up, and the other is thrown down, both with the same initial speed. What are7wuldijc2)az- 7 d 9ro their speeds when they hit the street?

  A brick is dropped from t6pdez-)esu 4nmih ; 2hhe top of a building. A second brick is thrown straight down from the same building. They mdp4e-;uenh)is2 zh6 are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The position+noa( f05 th c).ndsrrnb4e(d versus tim to(ar(dh 0dbc n nerfsn)5.+4e graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. y 4cp5 ifu2.-zqa5 rfyThe position versus time graph of this objq2 5u-cfrpiy 5.4zyfa ect is

  An object is moving with constant non-zero velocity in the +x axis-vs1; d .g(z7xnwvhymp- mgv /. The velocity versus time graph of hmxv1 nswm./-y;g 7d-vgp vz (this object is

  An object is moving with constant non-zw qjp nvt1g;7+ok dtd85 cg*k6ero acceleration in the +x axis. The velocity versus time gr 7dtv5dcq 8 1k*k6wpog+jgt; naph of this object is

  The slope of a position versus (p/uy u4c1x9 rrd kf.htime graph gives

  The slope of a velocity verjilyat-ooy.h ( 9 vz(1sus time graph gives

  The area under a curve in e8n *,8k2gi ufo vqa3dan acceleration versus time graph gives

  The area under a curve in a velocity vt9uc sg;0 bxi+ uu*h5kersus time graph gives

  If the position versus time graph of an object )la *a39vfz tyis a horizontal line, the object isa )3vt*zyfa 9l

  If the position versus time graph of an object is 6xd bz5tj 6ob/+58syk( thh9nfs2ftxlvqq3 :a vertical line, the object ist ssq5t yfxbd(boz 6h2lh39j6+/: txnkfv5 8q

  If the velocity versus time graph of an object is a horizontal line, the object*bl2 ey*hdqb+l. zlms7, )vgf isfle,ld2* vh b ml .b*+g7yqz)s

  If the velocity versus time graph of nonwh4t3v62g m;/imp:m - d 3/wcbwgkan object is a straight line making an angle of 30 degretvwc/ :;w /3nb i2k36mwp ng gomdmh-4es with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find hd3vk6+*0xh kd g,qlq both the distance traveled and the magnitude of the displacemenk*gdxhv0kq 6qhl3 + d,t vector.

  A boat can move at 30 km/h in ys5)gud4 u(aocs2* +3dbfm r cstill water. How long will it take to move 12 km upstream in a river f5m3u uryb( go*a+d)42c sfscd lowing 6.0 km/h?

  55 mi/h is how many m/s? (1n 6 tggi,,z*lt7/uin4nz o-qt mi = 1609 m)

  What must be your average speed in order to travel 350 km dh3btwc ctu.i0r5 ;q+*t( fgsin 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2.0x . sps,n/vzg7abb x hours and 57 min. What is the average speed ofvxz s ,g/x7npb..a0sb the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel x8v4 v2 boku cz)*nl 2w(u9guu400 km?

  A ly (light year) is the di.ptvgtby(6h*xblql fr0 f ,3-+ dnp 9pstance that light travels in one year. The speed of lipl hrxdyg -(v, q 9f3p fpb6*0nt+t.lbght 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 kmp 11 x7d0gymd2ob0t6v 2bn dp*oibg.o/h along a straight road and you look to the side for 4.0 s, how far bp p2 nx1gbd6 mvygo7id.o*d1t2 0o0bdo you travel during this inattentive period?

  If you run a complete loop around s68o 9 3e nt3w2tbjb 4n.xqcgwmvs x(-an outdoor track (400 m), in 100 s, your average velocity isgtj93n3s 2net x86(bsxqwc-.ovb w 4m

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km easu z;-:yprp 6wit, then 1.0 km north, then 1.0 km west to return-zu6ip;w:p ry 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 *;p*ove1jaab km south, then 1.0 km east, then 1.0 km eb **;vjpo1aanorth, 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 irqrvw78 k(zw8;vgv 3 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 8( vr k;8ziwvqwg73rv hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km :/so dgg k63yx pu7l7dlaq5a /at 100 km/h. What is the average spe7y 6/ gdkdl/:us 5alxq7poga3 ed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 j,g 3n kld.v xt6c-2fnlc6.b eh at 100 km/h. What is her average speecn-dlfjv.ktxe2cb6. , 3l ng6d for the trip?

  An airplane travels at 300 mi/h sr vjef531kc0dpz/ o6tlr. z;south for 2.00 h and then at 250 mi/h north for 750 miles. What is ts.rlfv ; k0c6erzd 3/zt 1jp5ohe average speed for the trip?

  In a 400-m relay race the anchormaa :+bcq2z 0tt:) )okunkpzb-gn (the person who runs the last 100 m) for team A can run 100 m in 9.nz:ut-+oc qaz tbk02 k): pg)b8 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 order that the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop after 11 s. The car's aver(2ey3 g2unxc/rey-rq(ic (is age velocity x3i2rer ((syi c-y g(e cqu/n2during deceleration was 77 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average srh2 h)1 ori/orate of h)shr2 /ri1oo$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 k eq ddj.9k8)kv*d :qosm/h 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 accelbx1 7wdi i6oyyq3)6 skwcy2qi*gn+e.erates at $4.0 \; m/s^2$ for 5.0 s, then maintain that velocity for 10 s, and then decelerates at the rate of $2.0 \; m/s^2$ for 4.0 s. What is the final speed of the car?

  A car travels at 15 m/s for 10 s. It then speeds up with a constan-o*b aiz63vq q,:;jvd wvbx7bt acceleration of ,j-qvb xv;7ivo:wbd* za6bq 3 $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 1.4 m/s experiences a constant acc 9/ha-u950d qh.kkn7 t7bkiv8jjddkj eleration ofjt09/djkj hkuhd98 -7.ikdav k7q 5 nb $2.3 \; m/s^2$. What is the cart's displacement during the first 9.9 s of its motion?

  A bullet moving horizontally to the right (+x direction) with d d7 o+tmfe y9qcd0oo4, .zhd h65sieiq.8 0bha speed of 286 m/s strikes a sandbag and penetrates a distance of 87.6fzbteqmc d,d4dhe8d qhoo o0 s.+iy9.6 ih 5701 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aire97 x kdg+u7qwi3rt r;craft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the accelerat 3 ue;77wtdqkxg+i9rr ion is constant, what is the length of the catapult?

  A car starting from r g3eos i qznj.x+u4nx.jc*w38 est 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. Wha4 yded4dfm dfbd (5m6h3u0 w6xt is its average acceleratiox( d6fm wddybh fdu 046me543dn?

  An object starts from res vhq4: i-v7-jj5x tqrct and undergoes uniform acceleration. During the first second it travels 5.3 m. How far will it travel during the tvtx5v 4i-: j7hq-rjcq hird second?

  An object is moving in a straight line with r7qllavvl,q czyjyc, k)02;6constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this tl,alvlrvq72q )0 c jz6yyc,k;ime?

  A car starts from rest and acceleratdyb i2c3b0b -des 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 ab5 ;tb+qsb)lii out $5.0 \; m/s^2$ 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 tu0w+z7ll3ebmzmp)z* m rns green, a car that has been waiting at the intersem3ze m zbw l7z*mp0)+lction starts ahead with a constant acceleration of $2.00 \; m/s^2$. At that moment a truck traveling with a constant velocity of 15.0 m/s overtakes and passes the car.
(a.) Calculate the time necessary for the car to reach the truck.    $s$ (only fill in numerical values)
(b.) Calculate the distance beyond the traffic light that the car will pass the truck.    $m$ (only fill in numerical values)
(c.) Determine the speed of the car when it passes the truck.    $m/s$ (only fill in numerical values)

  An object is thrown upward with a speed of 12 m/s on thbb3/midekr v, 1d/ko5e surface of planet X where the acceleration due to gra debvor/kb1 /5km3i,d vity 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 s 5gt/ 1oybmx53vq3uai+my:y/ i tgw 9of planet X where the accelegwm3:uty5t53/mg+yq a9/o s1 ivbxi yration 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 planet X wg+1 wz4hr1*da slz+h bhere t h++ds1rbg 1 h*w4lzazhe 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 upward with a speed odhf.bjm 3m1vm )c/bl/f 14 m/s on the surface of planet X wher h/)djmc1bfm bm3./v le the acceleration 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 yopch uhyreoi85 ;32, qvur friend holds a ruler between your fingers and reyro c,hqpvie5h 2u8;3leases 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 mmwt5 2.agr8d; b wlltfzi 2b://s. What is its velocity after 3.00 s2bg8flrbi l2t5wa:w m.;z td/?

  A bullet shot straight up returns to i6dgelr rn 6d4icvzf )9v 72cy,ts starting point in 19 s. What is the initial speed of 4z6gdy6,7nd 2cerfvlr 9vic) the bullet?

  A ball is thrown straigh p3uir q6k:eq-t up with a speed of 36.0 m/s. How long does it take to return to its star-p 6:k3eqiqu rting point?

  A ball is thrown downw4f2tgxiy7hha +(p w1a.)6h)d c n pzdjard from the top of a building with an initial speed of 25 m/s. It strikes the ground after 1.8 s. How highd+ta . xd )ncghah(h 7)jf6z4pypw1 2i is the building?

  A ball is thrown straight up with 9(ahf jt9e *l+hqmz7za speed of 30 m/s. (only fill in numerical val(ezzh9 9j+ta*h7 lfqmue 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 vp,xvq ;z8r0 ethe air with a speed of 32.8 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 15 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 15.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what f7pvckm- zfx28 c 8n6zis the velocity at t = 1.0 s?

  In Fig. below, what is the velocit*azu 0r+lv2(a jf6r usy at t = 2.5 s?

  In Fig. below, what is the vyy 3r)5s;vba;oafl: q elocity at t = 4.0 s?

  In Fig. below, what is the velocity at t = 5.i/mq7u 8+q3id-ad cm , xf*;h-mc khwf5 s?

  In Fig. below, what is the average;j-va o pv6g3c velocity from 0 to 4.0 s?

  In Fig. below, what is the average veloh-wueu)9mrt7l v:tx1j zc(s,city from 0 to 6.0 s?

  In Fig. below, what is the acceleratt :yc2j hten;qj17*crion at 1.0 s?

  In Fig. below, what is thv2fdx(t rvdp wd(+ 9yj9rw8g 2e acceleration at 3.0 s?

  In Fig. below, what is t was- :en:w3p 4*sxb.sqyv)cnhe average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to ezmv o;ee53 (*m* .z vftew,dd8.0 s?

  In Fig. below, what is the displacement from 0 to 8.ez7.zs;o ll aug*azgs4 .-kj 50 s?

Does a car speedometer measure speed, velocity? {speed|v igw6dz(;5i stelocity}

  An object can have a varying speed if its velocity is constv7ql1y8yasud6-7/ 8xbjbwrdt h.9yaant.

  The velocity of an object can be negative when its acceukhetog n3o *,.mbw/8leration is positive.

  If one object has a greater speed than a second obj wj.w9xrgmp4xs -4l; yect, the first must have a greater accelerationjx4;lw4 .xm-ry9 pg ws.

  Two cars emerge side by 3iv tja14bc/eo1u-c5l cgy- s 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 decreasesx 1hlpam0 ji;;.

  A baseball player hits a foul ball straight up into the air. It leaves thel 24cgwg)6o dk bat with a spee4glkg o6d2w )cd 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 happening c8 helj/ed;th81*k qb to its acceleration, how does it chanbq/k 1*d8jhle; c8 hetge if air friction is ignored?

  As a freely falling object speeds up, whatqr yt+b ybk; 0m-u,n7+c(jry b is happening to its acceleration, how does it change if air fricn ckrb,bmj+q0+7ybr (;ytu y-tion CAN NOT be ignored?

  An object that is thrown vertically upward will return to i 0 41puboqkmeco1gc39ts original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how o1cc 1eo3mq4gbp 9u 0kwill this result be altered?

  An object can have zero velocity and nonzero acceleration at the same time.,vqjeju ,wjfl:: u8o )

  An object can have nonzero velocity an ux*,:+fql 3/dm q5xfvx 2vtmvd zero acceleration at the same time.

  An elevator moving from the second h;xx;sr1qk0/ae rl 1bina+* t floor to the fifth floor making no stops along the way has zero acceleration all t01lxht e/iakn; arx+;b *1rsqhe time.

  A rolling ball moves f1 n(5(xku:0x8 lpykfz wnaj)i rom $x_1=1.9 \mathrm{~cm}$ to $x_2=-5.9 \mathrm{~cm}$ during the time from $t_1=1.6 \mathrm{~s}$ to $t_2=5.6 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.8 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=4.0 \mathrm{~s}$ is at $x_2=8.1 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps19 r: x6gr)6kipx dfxs around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.2 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its tra25eh76- jtpdppr bmg)1oc 1 nxiner in a straight line, moving 96 m away in 9.3 s. It then- bgr25nxtepp h1d)o7pjc 1 m6 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 from dawxyz vcx08m4 b2m 2:$10 \; m/s$ to $23 \; m/s$ in 5.8 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 u jmhycoeff:f8)uk(3 3n7)v w$19 \; m/s$ to rest in a distance of 79 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reac;cl 8o/wdm-if h a speed of $26 \; m/s$ 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 bu*0 5hhjj-ed :d* oxvegrst out of the blocks to essentially top speed about -* hdo0j*g:xdeh v5ej$10.5 \; m/s$ in the first 13.1 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 from a speed kv 2v-0bz:uvep/lv,7;lrdxd upoi0 3 of $18 \; m/s$ to rest in 4.52 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m lone94clsxxaco3* o g y1* qh/or9g on the highway. Assuming a decelerationhr o ocx oasxlg**1 q3cy9e/94 of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck g28v:tigze,252jink * r nzna u7/napgoing $25 \; m/s$ 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 6 cv hv u,)1proru1e,e10,000-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner p1urrhoue61,v,c ev) must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$