Suppose that an object trave+ju2 uyxg3ed 7x w3sg:ls from one point in space to another. Make a comparison between the displacement and the distance td+u7 y ugxe3j2wgxs 3:raveled.

  When is the average velygyj6 w3vz4x+l /o,y u 31utfcocity of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixttus 5y.cg0 mx0p6s wh4y in 8up06h 0xwgst y4sc 5m. s". This is a description of

  An object moving in the +x axis experiences an acu(, qwbll2 l2m p0zl2cceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow downgiop(a (p a3he9 (nvuv60 t+qv7nio y8 as it approaches a traffic light. Make a gvvyohuq(n8ptp+ev 67nai o i 3(09(astatement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins t9 +lucrdxj+ 9oo slow down as it approaches a traffic light. Make a statement concerning its a9rjcul+d 9+xo cceleration.

  Suppose that an objecz-p .o(cylq;vt is moving with a constant velocity. Make a statement concerning its acceleratiocl p.ozq(-;yv n.

  If the velocity of an object is zero, does it mean that tn.;re1 xkd:un :h *rbghe acceleration is zero? Support your gb; *:h.x 1dnrunke r:answer with an example.

  Can an object's velocity change direction when its acce5 pc/u 5 ieqg+rlhat,-leration is constant? Support your answ5l,erua -+ t/hcg5 piqer with an example.

  Suppose that an object is moving with constant acceleration. Make a stateme+ m0v4 akn):h)en tzeznt concerning ih n+mn k)):ea vt4zze0ts motion with respect to time.

  Can an object have increasing speed while its acceleration is decreasing? Sup*h9ns7 5 g/fzkvyj3 w x/kr(leport your answer with an (rlj5/yxszkev79k /n*3 h gfwexample.

  Suppose a can, after an initial kick, moves up along 0/qeg/1ouip 5bd z*k) fpmf2b a smooth hill of ice. Make a statement concerning f0kzb/52u) pgef o/*dpq1bmiits acceleration.

  Under what condition is average velocity equal to the average of*vw7xv zr0/3n3,kc3a qz fvq.uq k,3f jvyqd2 the object's initizwy j3qk 3. *ua3f2x/7fq q,,dqkv 03czvrnvv al and final velocity?

  Objects A and B both start at rr-5a5+; qgdg+mn.+um ameh ntest. 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 coma5qd;.+ h mu+ g-mnemtra+ng 5pared to that of object B?

  Objects A and B both start from rest. They both accelerate at the same ratyz99k:wnt lu- e. However, object A accelerates for twice the time as object B. What i n-wz:99ylt kus 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 f/s cgp3v)aipw0(v5 bk riction, which of ) a/c(g vibv3spk5wp0 the following is true concerning its motion?

  When an object is released from rest and falls in the absence ou/fw(u.ax, jq f friction, which of the following is true concerning its motiouqa/fju(w ,. xn?

  Suppose a ball is thrown straight up. Make a statementi w0oi e zbzv:a u34z3,)vk3ah about the velocity and the acceleration when the ball reke)4vv33: hwi0ab3zu ,zozai aches the highest point.

  Suppose a ball is thrown 2j-k y2ncg:pm(a4qu. bouu l3 straight up. What is its acceleration just before it reaches itguqbu a3 k(:-l .mup2 c2yojn4s highest point?

  Suppose a ball is thrown straight up, reaches a maximum heigwuswa-xr+ 74w hhu+9 we:m 2dw ig1j.yht, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is - 7wh.4:wx+m9wu+ ijw1uy 2ewa rsgd hgoing up.

  A ball is thrown straight up, reaches a maximum height, then-9ydsbe*oozr++tgjm:q n,( d falls to its initial hym- *oe(dd+, r9zt:+jnqobsg eight. Make a statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward e/k 2xb jhk yp)y la d029)+tf)fgo-goin the absence of air resistance. Make a statement concerning /bxy9 )okhap)g)0+ lg22ytfdfek- joits acceleration.

  Suppose a skydiver jumps from a high-flyc ,,z7cogtv) eing plane. What is her acceleration when she she reaches ter7zo)c e tc,vg,minal velocity?

  A ball is thrown vertically upward with a speed .+3we+ v x:novzy ny9cv. 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 that of the first ball? (How many times higher does the second bal ny evv3c+wyo .z9+x:nl go than the first ball?)

  Ball A is dropped from th,iq tn428) xlp(uyxcie top of a building. One second later, ball B is dropped from the same building. As time progresses, the distance betwe(2 i)yq48t uxcp,x nlien them

  Ball A is dropped fro1 )) vye(gquuw -lihp;m the top of a building. One second later, ball B is droppedgyu(l-);pev i)1whq u from the same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall buildin9 ,c8bkv4evhc g. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds,vvke9 h8b cc4 when they hit the street?

  A brick is dropped from the top g7zfi) 9vshtf 3+(9 chreq-leof a building. A second brick is thrown straight down from the same building. They are released at the same time. Nelctszfr)q f+hiehv793- ( ge9glect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero ndcdq9terukh-1 9i 5.kqw u3 ,7jqa7evelocity in the +x axis. The position te9cu w7hqni5 e3k 971uqd,dj- kra.qversus time graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. T9)k0agzjf psty9*, puhe position versus time graph of0ust9zk g9aypj *f)p , this object is

  An object is moving with constant non-zero veqoon ixwvf 8) +)ggud27w9(anr7o:itlocity in the +x axis. The velocity versf7i v )ugrw an9g7n(o+2owqod)8: tix us time graph of this object is

  An object is moving with constant non-zero acceleration in the +x axwp3bejh 9:t, his. The velocity versus time graph of this ,hb3 9wh te:jpobject is

  The slope of a position versus time xk1cv0ol.)5raxs w ( tgraph gives

  The slope of a velocity versus time graph giv8;e d(q.wn0q w+t)mhc;dp+fv pafs cqu3-a/ ees

  The area under a curve in an acceleration versus time graph ,pkhx 7582xzktt l( legives

  The area under a curve in a velocity versuq )thkg1l ;1ubjw: rw8s time graph gives

  If the position versus time graph o:y zhjv7lh i* 6ts:h(gf an object is a horizontal line, the object (y:7vj6h*zstg:lhi h is

  If the position versus time graph of4( i-e*2sfv .xpe6w bbjaeo q+ an object is a vertical line, the object isp 6x+esqo.-f2* (b b4ewvaeji

  If the velocity versus time graph of an object is a horizontal 6+prxgzu k- +gline, the object iu6 +pzrk- xgg+s

  If the velocity versus time graph of ang-xx)tv ;xc; /u3ykojc:2 ghs object is a straight line making an angle of 30 degrec/-gcxy s:;th3x)k vx;uo g2 jes with the time axis, the object is

  An object moves 15.0 m north and xs9ghjf ;6p 9zgwtx2 /then 11.0 m south. Find both the distance traveled and t/g2699p h wjgxz ;xfsthe magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to m zmwb;ag;a,h)ove 12 km amzg,;ab; ) whupstream in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi gw8 f jpj5k-v*yyx g084ss ,fs= 1609 m)

  What must be your averax yab8zsse b.0r e:a8:ge speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours :/s8);tr2qy yl tyy+yhklqc io44 g3x and 57 min. What is x;2t+qorh cl4s/ gky8y3y ):y4 lqiy tthe average speed of the runner in m/s?

  A car travels 90 km/h. How long +pqry2k, + qpudoes it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in og nzf 3pq;-z+ vu2c(ivne year. The speed of light is f+ v;z3nz-uc 2p( vgiq$3.00 \times 10^8 \; m/s$. 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 t wg,:4p l)fqg iuxuw+b85v;hand you look to the side for 4.0 s, how far do you travel +f5h giw gx8qul)u4pt;:,b vwduring this inattentive period?

  If you run a complete loop around an outdoor trei, (ipaa8snevhg2( m 3d .g;xack (400 m), in 100 s, your averagv3e xei(mgd.nas ap(2gi ,h8; e velocity is

  A polar bear starts at the North Pole. It travels 1.0 km sout-rbiw;ipm9 e-sl6 n t;9.yzwjm)h 1zqh, 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 was6hwr)j9iwp.yz;im -q 1nbezs-tl m;9 the bear's average speed?

  A polar bear starts at the bpc4,-jqc-oc North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km wqcco-c4-bp j ,est 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 bshu9i i6qvd)f)aah k7f* 2/ afor 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minuteh2vk7hbua iq))i/ds9 fa a* f6s. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/hl4zj4w. agr1k acf no q;*(t dm24e.ga. What is the average speed of the motorist for this tripqgl14.w jgaf nt;z*m.42k ra(4o caed ?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 kwh a+wsfd36gxp0crl0*g 8:9aoinmu8m/h. What is her average spe+g:0ilgmfasar938uh oxp w0ncdw68*ed for the trip?

  An airplane travels 2acoh1f- -y p at8xdtbot9,g9at 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed fobo-tf9 2 ct 89pa, dth1gxoya-r the trip?

  In a 400-m relay race the anchorman (the person who run1fnv0vdl 6 j,ns the last 100 m) for team A can rv0 jn1 vdl,n6fun 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, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop after 1(qp19yflccl jib )5/w1 s. The car's average velocity during deceleration was 78 km/h. What wq1iwcjl5 fp) yb/ 9cl(as the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average rateu3(fxdu r:w *n of wurnd *fx (u3:$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accc (bi,ox4lmd2elerates 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 accelerates at x74w iy53 j-c6 vnl9en71 o4bsie)q*i xlruhp$4.0 \; m/s^2$ 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 fvqu80 /ojfsk4 or 10 s. It then speeds up with a constant acceleration 04q/ kf8oujsv of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocik hdxawe+ ksuj-618.w ty of 3.0 m/s experiences a constant acceleration of .1a-juwk h+e wd8kx6s $5.0 \; m/s^2$. What is the cart's displacement during the first 4.9 s of its motion?

  A bullet moving horiz+qx9sla5. c5,wpjox1y b g3 j wn2xm,dontally to the right (+x direction) with a speed of 242 m/s strikes a sandbag and penetrates a distance of 23.54 cm. What is the 5sxy.l2d3 1j xxjqmbw9n , p5ocwg, a+average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane ,lf,/2td 6ytmur.7wq z(lj.k 1jnedgis launched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requg 2 ../lndq6mr7ylz 1d,wtfje, tu j(kires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with. -mz-iwms i.q 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/skdt/s;kz*etz5b h c.+ in a distance of 200 m. What is its average accelerationkcbd5st+tzezk.h*/; ?

  An object starts from rest and undergoes uniform acvkepx 7 c0eesqr j,1p8y,h; 8zceleration. During the first second it travels 1.0 m. How far will pp;7jh0cvye8 ,e8z,q xs ke 1rit travel during the third second?

  An object is moving in a straighg w.s pqt4my-*t line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far * g-4qwy.smptdoes it move during this time?

  A car starts from re ws0y 1mh-6ve4n+ knahst 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 decelerate 70n5u;g ,xqacuz msm1yq f h,0at 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,rwqwsy j b3l/yzoplf+b0ho ) 5n(,74 a a car that has been waiting at the intersection starts ahead with a constw +qrlz 7pl o jna4wsy,hfo()y50b/b3ant 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 xgbahxq64d:8)lk *jva speed of 12 m/s on the surface of planet X where *b4aj: h6xkg )8ql dvxthe 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 on 8zye hlt 7dbrf;r( 29l xsz*3bthe surface of planet X where the acceleration due tz3hb9 e z8tbly7 f l(x2sd;rr*o 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 plycb. hywnw0 f89mu 09ianet X where the acceleration due to gravity isuf.i9cb w 0mn8w 9h0yy $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

  An object is thrown upward with a speed of 14 m/s on the surface of planet X wher 52xaa;w+r ;gibvu .yre the acceleration due to gravitaib5.ur xa+w;y vr2 ;gy is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater e 7z l)g37: oacelol)nthan 0.10 s. If your friend holds a ruler between your fingers a)lnlo73: azlco)g7 e end releases 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 m/s. What isd1p19p) )2bo pw1ng8 cgo crlx its velocity after 3.1p)n8cw1)9x dcr2go1p l ogbp00 s?

  A bullet shot straight up returns to its starting point in 5 s;2xwrok fri,0( 0jmej. What is the initial speed of th(xwk oj2 0rrji;e, 0fme bullet?

  A ball is thrown straight up with a speedx6zj; r2c*r v.qe bhytn 8a)5v of 36.0 m/s. How long does it take to return to i*vthncb65vx r)raeqjy;2 .z 8 ts starting point?

  A ball is thrown downw.l8(*yqcmi6f/ k mpfu ard from the top of a building with an initial speed of 27 m/s. It strikes the groui(k/p8ml mcf6f*.qyu nd after 7.0 s. How high is the building?

  A ball is thrown straight up witzg;*3ktwi//i r r j1tfh a speed of 30 m/s. (only fill in numerical value in the bltz kr/jw1tirg ;3i *f/anks)
(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 of 40.9 m/s. -ndv1; y6ri7 ds,gq1 fgbg3b f(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 3 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 9 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 9.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocizwdytcb3 17y e +/ckuz09 h,sk: vx9hlty at t = 1.0 s?

  In Fig. below, what is the velocity6 e 2 xia3+u.syhbd23(blhsct at t = 2.5 s?

  In Fig. below, what is the velocity a,khjxf/q/4so o8m1yy wu3pi 2 h:eug 4t t = 4.0 s?

  In Fig. below, what y5sy5raklv:2u;i 1psl n8a9 hi,uw 7nis the velocity at t = 5.5 s?

  In Fig. below, what is 3*zu4dpnq 1 ysgliq1/the average velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity fromoga2mr5smx 8ms6fg;2g9(o:4us yat p 0 to 6.0 s?

  In Fig. below, what is t rz wu+-e*qc*dz)txhdmk-.o3 he acceleration at 1.0 s?

  In Fig. below, what is te+kql1ky h.9 j-wr(kb he acceleration at 3.0 s?

  In Fig. below, what is the average acceleration frm zcj 6xrsf1-22itdb;-n sr+jom 0 to 5.0 s?

  In Fig. below, what is the average acci-9t jrtr4 sy.eleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0:igk ; u1z0 z:9;pbx z f86vyklczlg/f to 8.0 s?

Does a car speedometer measure speed, d;c1(b -zkzg- ndd j/jvelocity? {speed|velocity}

  An object can have a varying speed if its velocity is constant.gb-)f9 d 2d bxwnckp): vi8w:dt b(,dr

  The velocity of an object can be negative when its accelerationy -s3c q ;.7at1jf/mkju-zcz y is positive.

  If one object has a greater snfftp9 a(m ,q ,2i4g;r;ewdfc peed than a second object, the first must have a greater afw(4re;p; n9f,iaqtmg2, c fdcceleration.

  Two cars emerge side by side from a tunnaou;qas. 98 rezfh-t si::a7 qlu8t .xel. 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 decre93pp*0fc eyd fvxz/tu s)e +zjdp/s 24ases.

  A baseball player hits a foul bal3km8xr76z7(dnq(8 f+fktggt zrq:h rl straight up into the air. It leaves the bat wqgf t3(:zqr8fkd 78zkg +xrmh6 rn( t7ith 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 acceleratifdx7mcj a58 f,on, how does it change if air friction is if8m c,x jd7a5fgnored?

  As a freely falling object speeds up, what is happening0kgv 4pe3x *rcoxg 1i5 to its acceleration, how does it chanig145r*cep3g0 o xkvxge if air friction CAN NOT be ignored?

  An object that is thrown vertically upward8p(/ydt hhs1t ge 11qv will return to its original position with the same speed as it had initially if air resistance h1h t1/vt8y1 e dsgq(pis negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocp wcbx q/a)rulwf 8y 5*69a8fzity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the sb6qo)f iv ct5/86l fakame time.

  An elevator moving from the second floor to the fifth floor making no stops a io) my7;5b zm2qgg8; ma)lzyxlong the way has zero acceleration all the time.)mggmy 28z yoxl5;qab) i7zm;

  A rolling ball moves f 5fr9a4b1y bocrom $x_1=1.6 \mathrm{~cm}$ to $x_2=-6.3 \mathrm{~cm}$ during the time from $t_1=1.9 \mathrm{~s}$ 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 $t_1=-2.2 \mathrm{~s}$ is at $x_1=3.3 \mathrm{~cm}$ and at $t_2=4.5 \mathrm{~s}$ is at $x_2=7.5 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps aroun 1v:d5ikt pahgtzb(8 tysi4;)d a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 11.9 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away fj y3zcj4-grv;rom its trainer in a straight line, moving 110 m away in 9.3 s. It then turns abruptly and gallops halfway back in 4.6 s. Cal zyg; v-j43jrcculate (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 fro0ymt)w dgmb yr1gf 3/d82f8rjm $10 \; m/s$ to $22 \; m/s$ in 4.3 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 from2 o-::ha)j j k.m+wxd agyi6fr $19 \; m/s$ to rest in a distance of 64 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a y,jacpj35ka (q uuq0+ speed of $27 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.3 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blognhg(p *j+zx.cks to essentially top speed about pjn h.g+(zxg* $10.8 \; m/s$ in the first 12.6 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 fromi)l5 mpo;atg( a speed of $18 \; m/s$ to rest in 5.46 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a cartp z:z; uwlzxg)n/ :(-eg* wvm leaves skid marks 92 m long on the highway. Assuming a gwpz zlv;/(t) :zn gwmx:*eu-deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going uchcw/;(h)k v $25 \; m/s$ 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 cooor(*l ns3;.invhi2 fmplete the 10,000-m run in less than 30.0 min. After exactly 27.0 min, there*h olvoiisn.2 3r(; fn 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?    $s$