Suppose that an object travels from one point in sprrh+m*msib5 i:-movv 6 t4 0siace to another. Make a comparison between the displacement and the distance ts05m+mb 4mtr-i6vo r:*vhsii raveled.

  When is the average velocity of an object ek hkd(51hn5anqual to the instantaneous velocity?

  A new car manufacturer advertises that their car can go n d35sxwnr3y97bb zm ,88 gghi"from zero to sixty in 8 s". This is a descriptisb7hn,58xzg 8bdmgi 9n3 3w yron of

  An object moving in the +x axis experiences an acci9 /6q(joevs 2awonu2xji:4peleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x dire f. )veta d8yng.06cifction) begins to slow down as it approaches a traffic light. Make a statement concerning its accelervg. e. 6y8ct a0fnfid)ation.

  Suppose that a car traveling to the West (-x direction) bmwjz 0t nu-cp76i)3pgs (8qsj egins to slow down as it approaches a traffic light. Make a statement concerningwi)g(js ppus cmq6z3n-8 70jt its acceleration.

  Suppose that an object is moving with a constant velocity. Make a statement ct 1(ubw;*xawfxqhp ms -701owoncerning its acceleraw;* w- twufhbmpxo(0s17q1x ation.

  If the velocity of an object is zero, does it mean that the acceleration is zer 4pcb:e4wqqj 4o? Support your answer :4w44pjcqqeb with an example.

  Can an object's velocity change direction when its acceleration is const6y:ih swy 88vdd h(rt3ii1h)vant? Sup( :vdy86vhs) 3ir ywdi1hti8 hport your answer with an example.

  Suppose that an object is movin9/h fqihn3+cxg with constant acceleration. Make a statement concerning its motion wiqhxci+n/9fh3 th respect to time.

  Can an object have increasing speed while its acceleration is decreasing1e*n 2bh/zl4cas hz9r? Support your answer with an ex9hzs nc bzh/e2 lr4*1aample.

  Suppose a can, after an initia 8 m0hwjlkp1*5(n)o. yp ouh5krm8opdl kick, moves up along a smooth hill of ice. Make a statement concerning its acce phno0(p18 ok)rp *58hmo5 yuwk dml.jleration.

  Under what condition is average velocixeh41yyv jv.ep5+bv ,x. e( hdty equal to the average of the object's initial and finale4 bxjd hve.v +(p1vy.x5hye , velocity?

  Objects A and B both start at rest. They both accelerate at the sam 0 bu9d27m9f5xumgpq2g(zen ce rate. However, object A accelerates for twice the time as ob7fx uneu g05m99 cgzq(b22pd mject B. What is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. They both acceler ,:ak5dasjgrz+h. o:oate at the same rate. However, object A accelerates for twice the time hdr+z, a5joskg ::a o.as 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 i845qkt j z 6bqtuhbj71n the absence of friction, which of the follow4jt qtb51k 7h8qz6 jubing is true concerning its motion?

  When an object is released from rest and falls in the absence of friction, whepbpyu cff7n*e76 fv,+cf,)*jc c( jpgjn2. zich of the following is true concerning its motion?ppf7,.7(j*) e bzcf 6ejcc *unypcnv j gff+2,

  Suppose a ball is thrown straight up. Make a statement ab;a(gy p1l 0kfnout the velocity and the acceleration when the bga;ln fp(k 0y1all reaches the highest point.

  Suppose a ball is thrown straight up. * oyv;1zg0b gz What is its acceleration just before it reaches v 1gozg* bzy0;its highest point?

  Suppose a ball is thrown straight up, reaches a maximum h j d1sm,0i/xjveight, then falls to its initial height. Make a statement about the direction of the velocity an0m ,jjxd/v1 sid acceleration as the ball is going up.

  A ball is thrown straight up, reaq(x:oew 8s( gjud fhpuww/0: +ches a maximum height, then falls to its initial height. Make a statement about the dirq0x/ww 8ws((oupehg +:f:ud jection of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. ke m3itd:8 (ytMake a statement concerning its 3t 8ye(i:mk tdacceleration.

  Suppose a skydiver jumps from a high-flying plan8kuol8ybyp lg1, n np+h 0+,zme. What is her acceleration when sl+,p 8u8hngo 0+nzbypmly1 , khe she reaches terminal velocity?

  A ball is thrown vertically upward with a skp z+x z2-2ypngx4j(cr* l* wrt 0/wbvpeed 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 many times higher does the second ball go than the v p*lxxg/( r z2nwk+cr-2y*wj4 btz0pfirst ball?)

  Ball A is dropped from the to9nb1tn4xt ;de j7ia g0-aaq8rp of a building. One second later, ball B is dropped from the same building. As time progre49 0an xeqj 7d1taagtb8r ;in-sses, the distance between them

  Ball A is dropped from the top of a building. One second later, y ibw *h+8;q+-uvvarnad5o/s ball B is droppe*+ uvs-v;5ar nyqh/bw +a odi8d from the same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top ofc1d y3+ ;8vzuz 3*xr xrcy):ot8x tqau a tall building. One is thrown up, and the other is thrownzryx vuy: uoc+*d)3az8qx1t8t 3 ;c xr down, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is thrown g*ci-4 2idsei:1p buiyg* 3u7 h f8bfvstraight down *cg *iibhdfe - u v7:gf8 1i32bu4piysfrom the same building. They 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 axiso, o qsu:f4e4h. The position versus time grapho foq:e4 su4,h of this object is

  An object is moving wi( 1cq.wr)pe b osxor57th constant non-zero acceleration in the +x axis. The position versus time goepc rs o17wx5)(bq r.raph of this object is

  An object is moving with constant n6;i)ezem nz+ ion-zero velocity in the +x axis. The velocity versus time ee 6zzm+nii) ;graph of this object is

  An object is moving with constant non-zero acceleration in gfn4cg8cp( +lthe +x axis. The velocity versus time graph of thiplf+ ( 4ngcgc8s object is

  The slope of a position verkjkjn;x,*d hy4v 9zj :sus time graph gives

  The slope of a velocity versus time gm )kwy+.m u.7wbc xbmw223zloraph gives

  The area under a curve in an acceleration versus time 4 34od*mgfwv 1l* ijbq6zaaq*sb1fs: graph gives

  The area under a curve in a velocity versus time grapah:(w, vol8z)w7 qmudh gives

  If the position versus time graph of an objec,i8o p6j vprc9 ,*yas/ 6syetot is a horizontal line, the object *6p,8v/ctjaor p9e,ysy6 is ois

  If the position versus time graph of an obje j :wbc6dc/pff (kp;0l 5hwsp5ct is a vertical line, the object isfpw;(0pbhf w s/ k5j:dc 65cpl

  If the velocity versus time graph of an objecyopgwwr+i zea9ett; +o( 5w+; t is a horizontal line, the object e opw +i+ea t5tz;og r+y(9;wwis

  If the velocity versus time graph of an object is a straignh humsg.wh9+-v i(i6 56dzdyht line making an angle of 30 degreesdiv5w . 9 gnu h+hhm6-6(sdziy with the time axis, the object is

  An object moves 15.0 m*:1ix cyr6sn1ti( jf+3m mikmcu) rz6 north and then 11.0 m south. Find both the distance traveled and the magnitude or3k1ci*fstmij:xy6r)c6z+(n m ium 1 f the displacement vector.

  A boat can move at 30 km/h in stillgme9u*k6u 31 8eupyoy water. How long will it take to move 12 km upstream in a river flowing 6 86y1e*3egpy9 umouku .0 km/h?

  55 mi/h is how many m/s? (1 8ao qhbg.7/zl mi = 1609 m)

  What must be your avepd../leut:ww9pq m.ea/s io1w e; w*trage speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximatemu 71m:5pd fix)c. jicly 42.0 km) in 2 hours and 57 min. What is the average speed of the runner imciu 1j:mxdc5i .p7 f)n m/s?

  A car travels 90 km/h. Hpj/qa rnv5(2va 8m g9bow long does it take for it to travel 400 km?

  A ly (light year) is the d)iz e1*ui yfx r;j.2kxq1(d.d hlkp6yistance that light travels in one year. The speed of light y .kx2iy.1hkd er)u;lzi6qfdpj 1x*(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 jms4 8 olnm0no(..+b nsgk 2fa 2tk/qnyou look to the side for 4.0 s, how far do you tr2solk.m gt s fm8jan/(2 n+n4.bkqno 0avel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, s(+s3+y iw)ijlq(vvu your average velocit++su q3iwv(lys)( jivy is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km e 4p*ag*qgv99x ica0fvpoc:- east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45ia9o xp*e0g ga v:qf4p 9vcc*- min. What was the bear's average speed?

  A polar bear starts at the North Pole. c:89-vjtdk8e3 79rsfc kykub 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: krutf- 9db8k7esck9vjc 38y trip takes 45 min. What was the bear's average velocity?

  You are driving home oz( y-dfcy466.cd rszx.1l.fm -xy aynn a weekend 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 15dx--.czy l16n ya4mrc (6 .zysf.fd yx minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is the avl8 5,tf)khv5i0 ukcdke*t6rp erag68f5cdtk0,h k*)tpvr 5 lekiue speed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 13a .t;9xuxuv p00 km/h. What is her averau9v x apux;3.tge speed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 6-qi*xpdst mkk(u 0g)gh5x+o mi/h north for 750 miles. What is the average speed fp(6o xiuhg0-txqk+gm 5k)*sdor the trip?

  In a 400-m relay race the anchorman (the pernc* sm8ioxmmd)sap) oha90 t : 91e+bmson who runs the last 100 m) for team A can run 100 m in 9.8 s. a 1o9h8ne*+)t)bx:m9m 0smoaps dm ciHis 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 9 s. The czqjo - v p/sdl1ju;/yq -d/vc;ar's average velocity during deceleration was 30 km/h. What was the car's deceleration while slowing downcy1/-l udo;jsd;pz - /v/jq qv?

  An airplane increases its speed from 100 m/s to 1 p9vhv+yqh; 3z60 m/s, at the average rate of v+3zhh 9ypvq; $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 kcnd*vhugm8bs p (v. ,sh8f/h(m/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 accelez07ayc 4cka bxin g7,7rates 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 8x cg+6*rxu(sqr.g1bqp1ex ye3r d8j for 10 s. It then speeds up with a constant acceleration 1cggr6e3 q+p8(xsy*8ruqxber1 . dxjof $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 3.7 m/s experiences a constant acceleration t*sc:7syt/zek1m i 3wotk1sti3 ezycsm*w:/ 7 f $2.7 \; m/s^2$. What is the cart's displacement during the first 7.7 s of its motion?

  A bullet moving horizontally to the right (+x direction4( xi5ykgd /.hn4qbab) with a speed of 427 m/s strikes a sandbag and penetrates a distance of 67.30 cm. What is the ad 4q(babkx h4.n/ 5iygverage acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is y2d0.6j-xvhmk 2tzyjij wl7. launched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant,wjxdytiv 7 jz-6lj .02.kh 2ym what is the length of the catapult?

  A car starting from rest moves with constant accelergt 0d-y.8 lz5i(x lkjxation 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 o -.dk,qx* pn0kkxd/a5 k w;jeto 80 m/s in a distance of 200 m. What is its average acceleraw /kd,ox n k;k k5da0-*.pqexjtion?

  An object starts from rest and undergoes uniform acceleration. Duri:i;b f;thc1zli -pjm+ng the first semtf-pbil ;;zc :hi+1 jcond it travels 7.5 m. How far will it travel during the third second?

  An object is moving in a straig* z:an2h vm)jgnbu;r8ht line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it r:v;2n 8h)*zgamnubj move during this time?

  A car starts from rest and accelerates unifb)3 9 ;cidfp, gk0pbieormly 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 abozvg2ky je w4(w+qs/w7ut $5.0 \; m/s^2$ 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 c-p7x q0 .knpa a auj,ey4z1;ucar that has been waiting at the intersection apcju -a4 e7.znkyqx0p1a;u ,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 spe j 3g tvnhuhd+fihy5gv-; 12*sed of 12 m/s on the surface of planet X where the t;gv ghuh n25y13-+ j*v hifsdacceleration 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 iws0xc)(eqmh +;x vj2on the surface of planet X where the acceleration dues j(2h;xvwx c+0iem)q 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 surfac 2 2,5zd;cqv/kwlq tvfe of planet X where the acceler,d 52z2; /wqct fkvqvlation 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/oa9i-ir c/hbnb ..( lss on the surface of planet X where the acceleration due to gb.-i(ic aoh.r b/ nsl9ravity 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 sg v0h)9ql4 cwgcm35 zvv/ph 6t. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fallwvhc)gmg/3pcv l659t v q4hz0 before you catch it?

  A ball is thrown upward at a velocity off. wx,j ybhiz( lt eo; l);g2hdg.f,*x 19.6 m/s. What is its velocity after 3.00 s?xyfl)fh w o,tj.,x2d(g ;e l*ibhgz.;

  A bullet shot straight up returns to its starting poin q8 93m7zy eko+)ymmlft in 10 s. What is the initial speed of the bul3oe8fq9lmm zy k+)y7mlet?

  A ball is thrown straight up with a speed of 36.0 6aw9 l4j3q* ncpb-dy qm/s. How long does it take to return to pcqywqa6jd3* b4- nl9 its starting point?

  A ball is thrown downward from the top of a building with an initial speed of h2 zmhr;ho4.t lb -h:q12 m/s. It strikes the ground2.bq:-hho;hl4rh mz t after 1.0 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only ;9sc mlh;yypj 9+3ryw fill in numerical value in the blank;;rwpyj9 3y l+ 9cymhss)
(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 o,b-lj4 nn9ci of9y1r cf 26.6 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 14 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 14.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocit2xi kfn/+(qtry at t = 1.0 s?

  In Fig. below, what is the vels88fv px7k *maocity at t = 2.5 s?

  In Fig. below, what is the velocitcsas 8 kj2zp+:yf*z -iu nszqal)(s.* y at t = 4.0 s?

  In Fig. below, what is the velocino2*7tk j2codv5;vnity at t = 5.5 s?

  In Fig. below, what is the average vmk9b020 o *emss mde*ielocity from 0 to 4.0 s?

  In Fig. below, what is the average vecs/fisarh5 2bo nfnpyvw ;2/)uu 81r 0locity from 0 to 6.0 s?

  In Fig. below, what is the acceleratik0e29 xv wrr;gon at 1.0 s?

  In Fig. below, what is the acceleration at 3.n lf/)5; rukdb, s ju*3l/lcfo0 s?

  In Fig. below, what is the average acceleratir6 2wn/vjl /sgon from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 8.)ki;gudgw , 7z0 s?

  In Fig. below, what is the displacement from 0 to 8+juy5vyz8 -m ip2mp f-.0 s?

Does a car speedometsi6wgp3 r,;zl er measure speed, velocity? {speed|velocity}

  An object can have a varyin7,vaf/q)6xt zg d)qrog speed if its velocity is constant.

  The velocity of an object can be 81sdeth/6fx y+p v f*bnegative when its acceleration is positive.

  If one object has a greater speed than a second object, s.gx4 .n njg2uw4pb:j the first must have a grea2.uw sjb:. x4gn4pj ngter acceleration.

  Two cars emerge side by side fr+(;p pi uzx*ulom 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 decr9 poidybe+ q8ua7m61 ieases.

  A baseball player hits a foul ball straight up into the air. It leavn*u u6lw,+ja 8vpgb1tes the bat with a s n 6vuw+1 ,gtp*jbaul8peed 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 speedmqk q(q+r m:)*m -pd 8slnsq)os up, what is happening to its acceleration, how does it change if air k m(dp) mmnqlo)+qrq:*ss8q- friction is ignored?

  As a freely falling object speeds u z281ek:y jbjfp, what is happening to its acceleration, how does it cb2 :f8j yke1jzhange if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its oru)*+y k6 vwekoiginal position with the same speed as it had initially if air uwky )o v+*6keresistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at the same e;v hue;0hm9sgas3fuh8 )1 en time.

  An object can have nonzero velocity and zero acceleratlprr6cc3qxm *;ozv2 3ion at the same time.

  An elevator moving from the second floor9s e;uqc;6d)jv l )ubr to the fifth floor making no stops along the way hase;)qsd;r6 )jubu9vlc zero acceleration all the time.

  A rolling ball movesm2k (s qzf2f47ubqd5g-f7rcg from $x_1=2.2 \mathrm{~cm}$ to $x_2=-5.4 \mathrm{~cm}$ during the time from $t_1=2.7 \mathrm{~s}$ to $t_2=5.8 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.6 \mathrm{~s}$ is at $x_1=2.8 \mathrm{~cm}$ and at $t_2=3.1 \mathrm{~s}$ is at $x_2=8.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-m qrole a4b6;3 uq+hb,xile ($1 \; mile = 1609 \; m$) track in a total time of 11.4 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away froh5(g m5n ii fthf6m20sm its trainer in a straight line, moving 98 m away in 9.1 s. It then turns abruptly and gallops halfway 6hfgmm5t52hs0i nif( back in 4.6 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 frcu bdwb8 .tja3:1t/etmi 8 ez)om $13 \; m/s$ to $23 \; m/s$ in 4.7 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 fromi- 6e1mkr ):9bn y*ngd ji8zpy $18 \; m/s$ to rest in a distance of 68 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach n+2 a0ur3 ps-u-gnb sba speed of $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.2 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentialvfpivx; d3d ldw**i /+ly top speed aboutf* ;dvv3* dpid/l xwi+ $11.1 \; m/s$ in the first 11.6 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 frojh4 ban6z:rbm77pferf 7) atvgz 5z6 6m a speed of $20 \; m/s$ to rest in 4.68 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 x61 fdoad4jeg(( a)y4.uzt c p7gq9 ifhighway. Assuming ( uac6 tzggj7 4.e9qipx )fyad f1od(4a deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck *b35zsdbar4kourb w2q )8g ngs w tif+,-pd84going $25 \; m/s$ 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).    $m$