Suppose that an object travels from one point in space toy5c fr*kn 5tc+ another. Make a comparison betweenrft5 +*5nykc c the displacement and the distance traveled.

  When is the average velocity of an objpn-,ls-3xut(v xtg q4 ect equal to the instantaneous velocity?

  A new car manufacturer advertises that thev4 g*6*v1 fo*5 stf b34li kgw.wqacvhir car can go "from zero to sixty in 8 s". This is a description6w k fi .*co3fw*5*vsvv gqb a1hl4t4g of

  An object moving in the +x axis experiences an acd bwoav:cf32.n 2jc *aceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East 18cafv)v qs ,g(+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning ,vgvscaf8 1)qits acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slornj1o tb;/j3e;ma a xhw9.z4ow down as it a a4j1bjoom nzxh;3 w/; reat.9pproaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a statement cilz/rxy4 rdw/z p8h 8l: s.-jvoncerning its acsri8vd8l4j:wyx-z/r .z lh/ pceleration.

  If the velocity of an object is zero,c f*fzg-wm(a08lgyy8 does it mean that the acceleration is zero? Support your answer with l* ( 88g-y0gffzay wmcan example.

  Can an object's velocity change direction whe9hl,4 j1mzvuqn its acceleration is constant? Support your anlmvz,q 49j1h uswer with an example.

  Suppose that an objef p+fqe+qd6 .jct is moving with constant acceleration. Make a statement concerning its motion with respect to timeqp6f++ d qefj..

  Can an object have increasing speed while its acceleration is decreasing? Sa1mlg08 wv8mc/ zypu+upport your answer with an +8w/am vp0 glmu cz18yexample.

  Suppose a can, after an initial kick, mo5. 3tyadkyuq-ves up along a smooth hill of ice. Make a statement concerning it. aqyy5 -3tdkus acceleration.

  Under what condition is averagm9bqi- iatjui:x*5,ze8fx+3vxhg7m e velocity equal to the average of the object's initial and final8aztm3: xv*hi9, -x fqgjb eix75mui+ velocity?

  Objects A and B both start at rest. T1u-6 xfby xefjiv56q2 hey 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 that of oqjyv1eb ux2- 6xi6 ff5bject B?

  Objects A and B both-rt bvhlo 3c3qk 2b*k3 start from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as 3 bvrkoc*3b2lqt3h k-object 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 the absence of friu wte +paiuw360 -5biuction, which of the following is 56e+iuut-i w 30wbua ptrue concerning its motion?

  When an object is released from rest and falls in the absence of friction, which-:txi:n ugq3 mipq8kg.7ggn9 l25 czl of ipqgn8l3:tmn2xk-lg g: q z.g 9i57c uthe following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocif .kfdg: wqt8cc,gron4:v jop 9p7)*ity and the acceleration when thq8*i:o gk9co7rpw4 .cg n)fdj,:vp ft e ball reaches the highest point.

  Suppose a ball is thrown straight up. joi+l e oju/.,i5g i yflk(z,) What is its acceleration just before it reaches its highest poif.i/eig +zkul ,5i,(l oy)ojjnt?

  Suppose a ball is thrown straight up3zh tk.63zadv, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the3d3.6zhavk tz ball is going up.

  A ball is thrown straight up, reache ba h(m-si81pss a maximum height, then falls to its initial height. Make a statement about the direction of the velp(1 sabs-m8ih ocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downw ohc5kly0/bd /ard in the absence of air resistance. Make a statement conce//5hok b0 cydlrning its acceleration.

  Suppose a skydiver jumps from a hi +shg*o5, xc5/zffqadgh-flying plane. What is her acceleration when she she reaches terminal ve f gco/ a*+zhd,5qf5xslocity?

  A ball is thrown vertically upware8k jy3 d3.zvzd 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 thatje3zdy8k z v3. 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. Og uq+ou6sg(3 one second later, ball B is dropped from the same building. As time progresses, th6 +o(uu g3gqsoe distance between them

  Ball A is dropped from the top of a building. One second later, btv8 z;ki4nd:i7fn d zydw;0 )yall B is dropped fromk nydd07inzf84 tw:i; ;zyd)v the same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thropen2 - b yuu)3zt* whgo(w+-drwn up, and the other is thrown down, both with the same initial speed. What are their speeds when they nye -* zhdu w-2(3u)rtbpwgo+ hit the street?

  A brick is dropped from the to vbkn g/lgb6ntcw5 d sw*+(;*vgtq:n-p of a 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 ofd;w lnt :vqs-nt k6 nw*b5*vb/g(+gg c the two bricks.

  An object is moving with constant non-zero velocity in the +x ax* fi-.p7grztwdj 5n((e1ru yuis. The position versus timru. (*5twfd1y epjn- r(7ziuge graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. Thlwfe39,f* yjne posin,e j 3fyw*9lftion versus time graph of this object is

  An object is moving with constant non-zero cpf sc 5x1;wo3ne*(gs velocity in the +x axis. The velocity versus time graph of thisc n;(e oxs*s3p5fc1gw object is

  An object is moving with constant non-zero acceleration in the +x axis. /zoism e(dxn e0/;xy.b 1zd ;l The velocity versus time graph of thisy( z dsn.em/;1bexo izld/x 0; object is

  The slope of a position pv8cibsfmy,3kx-k.0y b yz ri ,e3k (,versus time graph gives

  The slope of a velocity t +up :m,58oxt2euy xvat .pd/versus time graph gives

  The area under a curve in an acceleration ver jnrq0y(e 9n/vrpk/kj u ;rbmch+9 9m;sus time graph gives

  The area under a curve in a velocity versusuiwzffxlrb +o(0on u 8s lt)aqr//)i9 (0 seu( time graph gives

  If the position versus time graph of an object is a horizontal linw6:i8qj yzk.1fsnl6 gj;, kxue, the object isfwnk61;6y: l jjsqkz g,u ix8.

  If the position versus time )x32 easf enfzl 4xp93graph of an object is a vertical line, the object isfe xps23 xa)fe zn439l

  If the velocity versus time gramsqqg. 59 xgnbq6). d58 tx)pzxv -2sze) mwbwph of an object is a horizontal line, the object is mw)s2zxxb598-)6.qpdw.)x5gs zq m nqv gtbe

  If the velocity versus time graph of an object is a straight line making an a eo x36wq.jkz v4gfgk*,(g* yk*vb, jgngle of 30 degrees with the time axis, the ogo *bv3,xfkeky z64*gq*gvj(.wj,kg bject is

  An object moves 15.0 m north and then 11.0 m south. Find both the distancb5q1 i2v3 thpmvrmf/0 e traveled and the magnitude of the displacement vectpv tr5fv3mm qi/ h201bor.

  A boat can move at 30 km/h in still waterw 36s3lg h4ai(fc 5hkj. How long will it take to move 12 km upstream ih(kh34 f 6jla g5c3iwsn a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 mnt zmg+q5v /g2id7 ngljd5h)0)

  What must be your average speed in ordetb ;;izv1j ) 3aacgve000e gker to travel 350 km in 5.15 h?

  A runner ran the marathon (approximat 8uv x+4mmyl*iely 42.0 km) in 2 hours and 57 min. What is the uym* +8xv4mi laverage speed of the runner in m/s?

  A car travels 90 km/h. How long doascw1 u:zmrd(x:o 4 x+es it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one r2.m;j1x cwybq:/douq 1c1zeyear. The speed of liro.:/yqwm 12qx;uce1z1 cjdbght 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 lyci2 ncvio-j xp)64a,ook to the side for 4.0 s,xj- n v2,c)oi4cpiy 6a how far do you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, yourlcn ;hb 9s-9xs3bcc)y average vbc)b;sxlc- 3hs9c yn9 elocity is

  A polar bear starts at the North Pole. 8, zm64xoun(,o hvdbw It travels 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 take(vm,o8 xo4nw6b h ,udzs 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 kmhcw6l:g4r ps+l.et+a south, then 1.0 km east, hwa+r e.tpg: 64csll+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 average velocity?

  You are driving home on a weekend from scho bpqo2o2*qruytt /)6hol at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. ro t qu2yp*o2/)tb6hqYou arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h 0u t+el*gb *t02mumzm and 160 km at 100 km/h. What is the average speed of the m lu mb0tmmu0g+*tz* e2otorist for this trip?

  A motorist travels for 3.0 h at 80 km/us*ol5d 7up k*+ntr/vh and 2.0 h at 100 km/h. What is her average speed for the t*kvudro7s* 5ltun/+ p rip?

  An airplane travels at 300 mi/h south for 2.00 h and the9ht8 aydgy p+xyk/ zej .3 4ibqymw9;;n at 250 mi/h north for 750 miles. What is the average ;ay/xiptez; 8qy +mk w4 yjdb.9y9gh3 speed for the trip?

  In a 400-m relay race the anchorman (the person who runs t+54rju ibv7or u ,hg-lhe last 100 m) for team A can run 100 m uhi5r7g o +4,lr bj-vuin 9.8 s. His rival, the anchorman for team B, can cover 100 m in 10.1 s. What is the largest lead the team B runner can have when the team A runner starts the final leg of the race, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop afr* x1 -jrwvp ddf;r3b.r 7n:oiter 10 s. The car's average velocity during deceleration o:3xd wbr j-.r*pv nfr1 r;d7iwas 37 km/h. What was the car's deceleration while slowing down?

  An airplane increases its 2xtefa-/5k jjk b0rk+speed from 100 m/s to 160 m/s, at the average rate of jx5fb0ak-kr2+et/ jk $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rat;qr+. 0x3n a5we6pmt n oixz*ve 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 accelerat0gb spk2,2zhs es 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 speed j:bbz4h /3 sv60xqx9xz pqn8ds up with a constant accelerationnp0:x dbbh9/x8zq6 4sv qj3xz 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 7.2 m/s experiences a constanw hlgfjo .9//bt acceleration of/ /gwblo9j.hf $3.3 \; m/s^2$. What is the cart's displacement during the first 8.3 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a spee,gyyet ar/:1 jd of 246 m/s strikes a sandbag and penetrates a distance of 93.44 cm. What ,y:y1eg/rtja is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carv .ci:1d5 ) m/fvowq:bqvqi67 unza *xrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration q:z:a)u6 o .v5 c fqwidx/*1miqnbvv7 is constant, what is the length of the catapult?

  A car starting from rest moves with constantl)f*q-t gn13v oivw1a 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 its average ac zxv ize2(1o:**1z1ndpks otbcep 1sk:et1iz*b*n21vd( oozzx leration?

  An object starts from rest and undergoes uniform acc5ptr g u-wc*2igw9. iveleration. During the first second it travels 3.3 m. How far will it travel during the thitipr.- u*gcwg95v wi2rd second?

  An object is moving in a straight line with constw gw3a 1zg8in(0kq2qxn3ahu/ ant acceleration. Initially it is travelnqk 3iw 2hz/g( a31au wg0qn8xing at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates unifo cu6amck)xsa26i +6j lrmly 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 a 5zv +5jdeo+qaveg8t1t 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 waiting atq :nxxusyu(/g/g6 .aw q1j8z+x t8xsi the intersection starts ahead 6:t1 xzg q(ixq8 +s./w/juuxx8nagsy 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 the surface of pljx(k6 g11bsejn fg (3 z2uyd8xanet X where the acceleration due to gxs((y ekx j12fn 8du6gj3z g1bravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed of 1bqn8 wht vr -w8(ffsb3s65slp /joa.12 m/s on the surface of planet X where the accele8/hw prlonv3- f86fstq1swbsj a5b (.ration 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 th(kz .8yi7qwd ( )oxbabe surface of planet X whe ).o ai7dbqz((k8 xwbyre the 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 of 14 m/ w4yr9 xul861my- xysjjqa+kk,vzb 4( ku- ea.s on the surface of planet X where the acceleration due to grav 4b yk- a z6u,1uw9rl(vx+4ya ys8kjx mqe.-kjity 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 frien fa3+us )w5pvk0y8 gddd holds a ruler between your fingers and releases it withdsfp3 0d5ka)v guw +y8out 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 its vmtw:hhk*-s/9 mq 7bklelocity after 3.h: mwtq- k k9*bhms/l700 s?

  A bullet shot straight up returns to its starting point in 18 s. /bvxm8g/a/8 x gjqe)q What is the initial speed of thmxg8/ /g jxq8/ba) eqve bullet?

  A ball is thrown straight up with a speed of 36.0 me2khd524rh ge /s. How long does it take to d22k4r5 heheg return to its starting point?

  A ball is thrown downward from the top of a building with an initg6 x fqi0ah s n).g:zrm5+k1ojial speed of 10 m/s. It strikes the ground ij.krgn 15z:g0f+o xq shma6)after 6.5 s. How high is the building?

  A ball is thrown straight up with a speed of 30 ; vtdmbkl53:k m/s. (only fill in numerical value i3l;:td5 kkb mvn 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 the air with a speed ofrwq6pa;/q u/m;svp9xi**j 1t b2i,*pfvt sb u 24.5 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 10 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 10.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the g/va 220 jo;i0iqx+7j3mw p,fsicksn velocity at t = 1.0 s?

  In Fig. below, what ishg/qf1lua14 wo j4 ep.t m3bs7 the velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4nvc10my9x(l i1 ozalo.dq 4/s .0 s?

  In Fig. below, what is the velocifd;54)b.ijk83amcg j (ycs1g kpke3cty at t = 5.5 s?

  In Fig. below, what is the avglvj80ap1csk-ae.l ri0l 9u6 erage velocity from 0 to 4.0 s?

  In Fig. below, what i9)d vteioi 8c.; fin-is the average velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 sr bh;3ea *btr9cau*dg ut*g7 8 vcl3t/po-8vi?

  In Fig. below, what is the acceleration at 3.0 s?w0 i3pmmn. k(v

  In Fig. below, what is t a*v( a3kk.nub oywl1duu84p9j 5:qo yhe average acceleration from 0 to 5.0 s?

  In Fig. below, what is the an,szpii 8f )cj :l nzo:p4:0eiverage acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8.0 s? d j.0oqnsu;271hzq vl

Does a car speedometer measure speed, veloca ngqk) 9xe7g6 z(5qwhity? {speed|velocity}

  An object can have a varying speed if its velocity;0q m jajxw1cpw3a7i* is constant.

  The velocity of an object can be negative when its acc. ,t xzw5wf,e2g+ jwctgr2vd3eleration is positive.

  If one object has a greater speed than a second object, the first must have a bd 2n *lzbbv ucs;255iu3yb6h e/ji(egreau/ 6b2suly*e cz3j dn2(vbh;bi be5i5 ter acceleration.

  Two cars emerge side by side from a tunnel. Car A isug0x4rbwq7 1;/sa bexz1r(ju 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 incre0swe jex 3s: 83k:bu o2kfd)itasing in speed as its acceleration decreases.

  A baseball player hits a zo6nc6fk h )/4zbcb)nfoul ball straight up into the air. It leaves the bat withb b6)n)cf4zz6 kn/oc h a speed 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 to its acceleration, hoaf2d cw:0r -pa,wma, mw does it change if,-,ampw rwm f:c2aa0 d air friction is ignored?

  As a freely falling obj7ok st ,pw ned8ek.1rcv,0 2beect speeds up, what is happening to its acceleration, how does it change if air frdv7er, . 0wo,tnkk8see pc2b 1iction CAN NOT be ignored?

  An object that is thrown vertically b/vnzsgiyp; 39- gtvpez9b6(upward will return to its original position with the same speed as it had initially if air resistance is negligible. If air resistan/y-pv bn9b6; 3 igpz9zvg (tesce is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at k.)*qy - cs-hei)agox the same time.

  An object can have nonzero velocity and zero g,7c 9 r4pghzzacceleration at the same time.

  An elevator moving from the second flo1 zp.yw 9/cr4adv7el0 s-rtgeor to the fifth floor making no stops along the way has zero acceleration all the ti0gwy t-r czpasd .7/rv19el4eme.

  A rolling ball moves fd*80xa+uyx (l 9 mqcgqrom $x_1=1.9 \mathrm{~cm}$ to $x_2=-5.9 \mathrm{~cm}$ during the time from $t_1=2.8 \mathrm{~s}$ to $t_2=5.9 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.4 \mathrm{~s}$ is at $x_1=2.2 \mathrm{~cm}$ and at $t_2=4.0 \mathrm{~s}$ is at $x_2=7.8 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around 6hk:iyx*cb(nqbw -3va quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 9.7 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, movi t7)f9bwy*fjzt.-gwd88sc rzgw h/j3 ng 107 m away in 11.5 s. It then turns abruptlzj3 8ffwygr d)sb z t*.98g-7hc w/jwty and gallops halfway back in 4.5 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 t eua:0m0 :bhk, u6zim2mg y4p$12 \; m/s$ to $24 \; m/s$ in 4.6 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 7sncky3p/)b i$17 \; m/s$ to rest in a distance of 79 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speeyx 8 hy .v6,zwafk3a jkmct25457erryd of $25 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $3.0 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of t2e+e08q 8 ,be -ssnk0vu dwaewdh w,f/he blocks to essentially top speed abou 8,e8k+n wfeeqbh 0sa,-d0v2/dseuwwt $10.1 \; m/s$ in the first 12.4 m of the race. What is the average acceleration of this sprinter?  (数值)  $m/s^2$ and how long does it take her to reach that speed?  (数值)  $s$

  A car slows down uniformly from a speeh. -pwkrzr1fxq)7 dp8c jzj+*d of $17 \; m/s$ to rest in 4.91 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m loss8:fgiz g x44ng on the highway. Assuming a deceleration ofgsxf4: szgi84 $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truv -scbos3 je:* k+wti(ck 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 less than 30.0 min. After 2 /2o 4 htr4b,0kdx +vppl41 hcumrloyexactly 27.0 min, there are still 1100 m to go. The runner must then r/4ky 4b1m 2 hoh2oxu4pdtv, 0lc+lpraccelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$