Suppose that an object tr1h/ on;(9vz npp; meywv7g5xv avels from one point in space to another. Make a comparison between the displacement and the distance tra (;hpvw7/5v;oe1m zxpn9nygv veled.

  When is the average velocity of an object equal toa)d*s3h7b zni fpus*wff9::) ye4kao the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zj9n*s c no*b,7gm0pduero to sixty in 8 s". This is a description cg*7n9o0u jnsb,* d pmof

  An object moving in the +x axis expx osf2 b;b)2dqeriences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car travelingqw.(h nzdyulsn tw6(o2u r//(a(k. ql to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement co wz((qru./6k (wdo n2at /nshl(ylu. qncerning its acceleration.

  Suppose that a car traveling to the Wu-*s1e8qqxtnk w.rn* est (-x direction) begins to slow down as it approaches a traffic light. u**.-n 8xe kw qrqt1nsMake a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make i 03wu/j)i, oxb9o i2qw vk0cla statement concerning its accc/io xij0bkwo wl)3q9 2viu,0eleration.

  If the velocity of an object is zero, does 2+nkt +mrmd w6it mean that the acceleration is zero? m6rdm2+twn k+Support your answer with an example.

  Can an object's velocity change direction when its acceleration is consta2u /nz;2i8)qefdbph )1 aj- h iv )yvap3jyp-nnt? Support your answqha-- inpin3 pev8judjhvzy;) 1 2)/yp 2baf )er with an example.

  Suppose that an objec xt9i2*q 1 u+zf;kf*8ogyim e)ffhcq:t is moving with constant acceleration. Make a statement concerning its motion with respect to i1;ffi**f fhz+ 2eo ct)yg9 :mu8xqqktime.

  Can an object have increasin iel*76nw8nspt * r6n,dhj f/uwtu9j:g speed while its acceleration is decreasing? Support your answer with an exwwjfh,*nnu *jr6ptut d sen867 /9i:lample.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. Maker9oy1bs lsy .8 a sta8lrss.9 yoby1 tement concerning its acceleration.

  Under what condition is average velocity equal to the average l7t vv v7ej9l6 8ph0yqof the object's initial and final velptv98 j7h70 l l6yvqevocity?

  Objects A and B both start at rest. They both accelerate apb7 4zp)+ vij*n1zf2drtou- j: xbdo+t 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 objectj:pud z+tdb*v ofnxo)+zj 4ir127-bp B?

  Objects A and B both start from rest. They botyy/i,u jjbew)8 w.mx/h accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance 8 jy,iw)u/jbwxey/ m .traveled by object A compared to that of object B?

  When an object is released from r4p s+ck0me;ie est and falls in the absence of friction, which of the following is true concernemci ;pkse0+4ing its motion?

  When an object is released from rest and falls ink(u3h b+p/7vpavak4 quo 8,gh the absence of friction, which of the following oak pp,h4uvk3/buqh(8+ vga 7is true concerning its motion?

  Suppose a ball is thrown straight up. Makq5b0, fxwuhc77c ,/syv3bt jge a statement about the velocity and the acceleration when the ball reaches the highes7wb /sq cvbhy73,0uxg 5tj cf,t point.

  Suppose a ball is thrown jlt pvfr i*v*s,b,6k a,,m qj1straight up. What is its acceleration just before it reaches its highesajpbv1jv6 r, mil,t ,*sq fk,*t point?

  Suppose a ball is thrown straight w+myl 1t aw 6y. q6le,wznxlf.dk;mv6;z;.zv up, reaches a maximum height, then falls to its initial height. Make a statement about the dire6zf nzaqd.w+6,v.vlwme x.t6;1 z;w lmyyl;kction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum heigk:72 cpzwrs+h a50 hxfia/ r0aht, then falls to its initial height. Make a statement about the direction of the velocity and accelerat2+/i0ha c5xz fs rp0awh7a:krion as the ball is coming down.

  Suppose a ball is thrown downward uk) 4+ qga4k5hq f6bfx4ffmj-in the absence of air resistance. Make a statement concerning its acceleratiox54fquk6+aqm - fk bh44)f fgjn.

  Suppose a skydiver jumps froivc4i kv0nt3(msjf, vmh*z( .i k72kbm a high-flying plane. What is her acceleration when she s (2k b0.i 3 ncmi zjkth(m*k4vv7i,svfhe reaches terminal velocity?

  A ball is thrown vertically updqs: z se,)o*xward 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 that of the first ball? (How mans oqd:z*s, ex)y times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. One second latd 7y-k aldt+zsput en:m)( 44i boh8g;er, ball B is dropped from the same building. As time progresses, the distb; (di4em paut)-yo s78gk n+l thz:d4ance between them

  Ball A is dropped from the top of a building. One second later, ball B if; a xvleo+s:oyf,j)9s dropped from the same building. As time progresses, the difference in thev fl:+)xfo ay; 9eo,sjir speeds

  Two objects are thrown from the top of a tall building. One isr4 6zkh (z3cl*ihfgtru64 q6a thrown up, and the other is thrown down, both with the same initial speed. What aq*46h6ui4r6 3(zlatzh rk g cfre their speeds when they hit the street?

  A brick is dropped from nzvqk(.z v,hm9lh ,fd1g3u- xthe top of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistav.l9(,qzmdzhnx u3k-f,g 1vhnce. Compare the accelerations of the two bricks.

  An object is moving with constant n xm* 8 n;v 7+klk+l3b(fglvfcson-zero velocity in the +x axis. The position versukc+;ls 38vf(gml+*nvbkx f l7s time graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis43 caopv)d61m1 yfbcc6) ucya. The position versus time grapcmy1a p)vuc)1af3y4od 6 6bcch of this object is

  An object is moving with constant non-zero velocity in euruh688oog,ntv0 w zhdi( 6w p,li,-the +x axis. The velocity versus time graph of th6di uz,hwour,l(-w vtg86n8e, oi 0hpis object is

  An object is moving with constant no g-zogekrq -r29zdf1:y6z18 rzs8 m f b8f4vqqn-zero acceleration in the +x axis. The veloci r sfq o8qyg 18:zzgzv48 qr-kzr-d6e2m1f9fbty versus time graph of this object is

  The slope of a position versus time gra-h:y/dku/utzs;v 1t iph gives

  The slope of a velocjm a*j98j)urk )uo8qzxi7*of ity versus time graph gives

  The area under a curve in an acceleru qa(md08 .yepdtf- 9hation versus time graph gives

  The area under a curve in a velocity versus time graph mz wm81r3 p/ eh(c,h5xcavpkmuv)a- + gives

  If the position versus time graph gza b 1c j *8/v-22cln7c )ozxtngi7dwof an object is a horizontal line, the object i a-d*vnz)l27t1bc ncz xi c87jow2gg/s

  If the position versus time gr 5pu: 8gd6kye3 v-vyllaph of an object is a vertical line, the object isv v e8:d53ly6py-kul g

  If the velocity versus time graph of an object is a horizont9 brx t*mk7*-tnwzf :jal line, the object i9r** n7tf xkj:bwz -mts

  If the velocity versus time graph of an object is a s 39us2zraj5r8 gua;dutraight line making an angle of 30 degrees with the s 2gua3a89udzurj r 5;time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find bctr m,mo6l dj uq*-4i.oth the distance traveled and the magnitude of the displacement lqr-,mm*d c4uito6j. vector.

  A boat can move at 30 km/h in still water. bx */5vi3sa . nh-6haby+efbo How long will it take to move 12 km upstream in a river f vs o35+axb nihbfhy*.6/-abelowing 6.0 km/h?

  55 mi/h is how many m/lirkt1 d sam2zq6(.a, s? (1 mi = 1609 m)

  What must be your average spee t lg3hg9s9xj,d in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. y s bt-tq:u73apr (tk1What is the average speed of the runner iraty-7u sb1k: p(tt3q n m/s?

  A car travels 90 km/h. How long d(3 nv2.hfnvhsoes it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one yx-drl6 -y-5 nek nomh4ear. The speed of lightmh6x-kn4l y- ro5d-e n 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 look to the sideg ,g:1djcggw/ for 4.0 s, how far do you travel du,gwc/jdg g:g1 ring this inattentive period?

  If you run a complete loop around an outdoor track (400 m we0m benuon9:c)sws: k9/ s(72wwb9mp(atqw), in 100 s, your average velocity isqt9n:u sebws wemn2aw : b0/s9)kw(m9pw( 7 oc

  A polar bear starts at the North Pole. It travel k;dau )j76hfszic39 bs 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km wes 7iu k 9d)zjhasf;cb36t 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.xx.) xn;+r3sedn o+ ev It travels 1.0 km south, then 1.0 km east,exx)x +; dsv.eno 3nr+ 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 week/i1j fit: ay/iend from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from s ajif1i/iy :/tchool?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is the avera,1tv2g( gq090 dv0zm u nxauagge speed of the motgnz g0avu va ,gmd(x19qut0 20orist for this trip?

  A motorist travels for 3.0 h at 80 kmw9u6rpw dq 0h,ythx/ (/h and 2.0 h at 100 km/h. What is her average speed for the9yxu/0 q ,rth6whp( wd trip?

  An airplane travels at 300 mi/h south for 2.00 h and then lpq,v6kkx) dj)6m 7nn at 250 mi/h north for 750 miles. What is the average speed for6n6mk, jlkv) )7d pqxn the trip?

  In a 400-m relay race the anchorman (the pe q,/i r74.zjgd3tvlu wrson who 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 runnerijz,tl / 3r.u7v4 qgwd 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 qmef3g vhq6 4l.pg1a 4stop after 8 s. The car's average velocity during deceleration was 72 km/h. What was t gghq.1qmp fel64 43avhe car's deceleration while slowing down?

  An airplane increases its speed from 100 4ngu .+ uiylfo qv/i6-m/s to 160 m/s, at the average rate of +yg uv/.i n46 -lfuqio$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the ra r.g1ahwsx41ffcr 3j /te 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 accesb-j1rixm.t. lerates 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 d10ox3ev :d )p xpxs9swith a constant acceleration 1vxd3e)p s9:x op0ds xof $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 6.8 mc) 0wpy7p+har cub;h;/s experiences a constant acceleration ofpw7;rhpcau;bc ) y h+0 $2.5 \; m/s^2$. What is the cart's displacement during the first 6.0 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 5z3eoksj ag gnl)n)/l iy5mb1r52 o)x617 m/s strikes a sandbag and penetrat) z2l/oybi 6j) xe g31l5mgk)snan 5ores a distance of 67.03 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is r/ow8vwo1ee7 launched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at th/ vwe71o8e owre 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 m s:fvz,w7rjl 3oves 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 in82qgr/ w7jh99x/ ezrto2 h iad a distance of 200 m. What is its average accelerj9/er o9r hx/i7dzg8a2tw 2hq ation?

  An object starts from rest yos.j sl b;2ei 8vpur32bi7:r and undergoes uniform acceleration. During the first secos;8r3eipbysvi2l7b.:j u 2 rond it travels 6.3 m. How far will it travel during the third second?

  An object is moving in a straight line with constant acceleration. In(o9ezev7 3ev ditially it is traveling at 16 m/e7 9(zveoev3d 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 acceleratess3 1 j ,j-8kesksjv:ia 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 abor j)y227p ;0 ysdr;okcu)fw yvut $5.0 \; m/s^2$ 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 gre2xvae7 du2dr9en, a car that has been waiting at the inte2derx9av u27 drsection 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 , h)2pb7yo+ +khmsb psmg;s6mof 12 m/s on the surface of planet X where the acceleratm sh kbpmomb6 7+)y;hg,+pss2 ion 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 n6 qfp-l*( mqfon the surface of planet X where the acceleration q 6( f-q*pmlfndue 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 wwt5 eu8e1) d6vtwb (mehere8w(w e em6d1)ebvtut5 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/s on the surface of plafka g3mfu-3-nyr b 44jnet X where the acceleration due t3ra 3umnf-b-gf44k jyo 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 z 4:8rh8ib9-1 avpd,gz hvjuy0.10 s. If your friend holds a ruler between your fingers and releases it without warning, hohb ,vugv84 9ipya :z8drh-j1zw far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at 3+ mm7s uqics+9y 0u1bpiq6eb6mova :a velocity of 19.6 m/s. What is its velocity after 3.00 s7ms0+bi+ 693 bouue:m6 cqapyi1vmq s?

  A bullet shot straight up returns to its starj02vku sh5nhe:l3zl 5 ting point in 18 s. What is the initial speed of tk j eu5n l05s3v2z:hlhhe bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it tq;f w2nd:y.c*cy iz2pt0utw ) ake to ryc0i2tuf:dp nw qzy2. )w; t*ceturn to its starting point?

  A ball is thrown downward from the top of a buimm q3r t0bec-vv3 c-as 4(mk;qlding with an initial speed of 24 m/s. It strikes the grq kc-t(cv4-3e amvms;br 3mq0ound after 5.1 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only 9dsth1yseqs6 hg 15d *fill in numerical value in thetqhd19sshydsg e6 5* 1 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-3dsfr i4y x9r of 24.0 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 2 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 8 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 8.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity1qelgwq,tdyb,0w* i aje(u07 at t = 1.0 s?

  In Fig. below, what is the velocityi+9f j0bgqq9 3y:dbuswb3k n- at t = 2.5 s?

  In Fig. below, what is the velocity at t eyp0,o 3hl3 b8cd2eyu= 4.0 s?

  In Fig. below, what is the veloci4(r 9tvgqhtc1ei 0 n.scn qr11ty at t = 5.5 s?

  In Fig. below, what is the average)iz vp/z5 /e wpywmo.j oh5..q velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to h y98r7m wfvm+6.0 s?

  In Fig. below, what is tc:i4 oeuj(cd-he acceleration at 1.0 s?

  In Fig. below, what is the acceleration at 3.0 mm.px3ao*-4nnxt ;w ws?

  In Fig. below, what is the average ac hp ) g0/6sufp:y*rqu3 wq-v,4cjsy jcceleration from 0 to 5.0 s?

  In Fig. below, what is the average accelerationw9e184 eahmoat ( /exb3s uuk/ from 0 to 8.0 s?

  In Fig. below, what is o e33vciqd ;o4the displacement from 0 to 8.0 s?

Does a car speedometer d8cj8j5.kdf3 hfxo m+measure speed, velocity? {speed|velocity}

  An object can have a varying speed if its velocity is constansly8seq5* g*kt.

  The velocity of an object can be negative when its acceleg 7z:hw.r8 m2kdwy*boration is positive.

  If one object has a greater speed than;,nk hc6aul 8v a second object, the first must have a greavlc hu6,8kan;ter acceleration.

  Two cars emerge side by side fromg bm4wwy,06e) 7fw2fzpbfcy / 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 l(wj x0x 3l6acrp)v +xfjgw:; acceleration decreases.

  A baseball player hits a foul ball straight up into,i 3ko7hnw6je the air. It leaves the bat withwi,k76 ojne 3h 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 acceleratiodhym)-3 h/6 f, k:kbufl,yeuzn, how does it change if air friction is ignored)3lfhdb:u-k,em, hfy uz6 /ky ?

  As a freely falling object speed(p. mczqx*, u9lclal *s up, what is happening to its acceleration, how does it change if air friction CAN NOT cll *9.cz,mp xa* (qul be ignored?

  An object that is thrown vertically upward will return to its o(ih94s6xm vm ei;k oxm b0+v7hriginal position with the same speed as itsv +m(6x9vx 4ei7 ;hhbkio0mm had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzerol;;yyh+ a6 ,-u 7xxvin,o cyky acceleration at the same time.

  An object can have no 8wcu81qkb yd0nzero velocity and zero acceleration at the same time.

  An elevator moving from the second flosf)rc*h*s rn;qe v io v-+n55for to the fifth floor making no stops along the way hs+*-nos nfhcirefrq * ;v5) v5as zero acceleration all the time.

  A rolling ball moves fromlt-:tp6 b 3mya $x_1=2.9 \mathrm{~cm}$ to $x_2=-4.8 \mathrm{~cm}$ during the time from $t_1=1.7 \mathrm{~s}$ to $t_2=5.5 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.8 \mathrm{~s}$ is at $x_1=2.2 \mathrm{~cm}$ and at $t_2=3.4 \mathrm{~s}$ is at $x_2=7.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a qmogy8,m-q /6 (1gdxuhwdd fh ;uarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 11.3 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 112 m away izx54t5.;)aky aaecr veo)dz9h(5 dl gn 11.3 s. It then turns abruptly and gallops h(zaczo5 9 yk e5d4al.v);hagxr5)det alfway back in 4.7 s. Calculate (a) its average speed  (数值)  $m/s$ and (b) its average velocity  (数值)  $m/s$ for the entire trip, using “away from the trainer” as the positive direction.

  A car accelerates from:l gzo:9pk;oym38x po vp( a9e $11 \; m/s$ to $24 \; m/s$ in 4.4 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 froe; ak9 qrm1 wj.*xcs4zm $17 \; m/s$ to rest in a distance of 59 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed y nm2k, v7clee1)gzz3of $27 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.7 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst outno t1n ab 2t4ryh4vz gfqo*3): of the blocks to essentially top speed abount1vy4nzh2go bra 3f :t )qo4*t $10.6 \; m/s$ in the first 11.1 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 ht/s hec 58wd*speed of $17 \; m/s$ to rest in 5.72 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m long on the highway. i1 muu26e +o-oe4t huadoz7s5Assuming a deceleratio6aemus71tue+iod4u 2 z5 oho- n of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck gauvh (e0rni- rg.ta 9.k( n3oyoing $25 \; m/s$ 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 rdu2m)c wbroh6/j r7p4un in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner rm2/)urjc b 6h7d 4owpmust then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$