Suppose that an object travels from one point in spaan5nq z6m j5gd/-e yt6n.u9rnce to another. Make a comparison betwe9-zqan5n / r.mynu5d66e ntgj en the displacement and the distance traveled.

  When is the average velocity of an object equal to the instantaneous velocx5a: ktm-uc ge -rja6;ity?

  A new car manufacturer advertises that their car can gf)f le :s(x7afo "from zero to sixty in 8 s". This is a descria)7sxfel : ff(ption of

  An object moving in the +9dpqq(z 9 +ka tnb-:ckx axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x d2ncai bj- fn9-1 go 8q4a*bvh uu1k.rnirection) begins to slow down as it approaches a traffic light. Make a statement c1*8 ahconru-9-fai n1nbu2j g4 .qvkboncerning its acceleration.

  Suppose that a car travela+fv+ ik )vq3+(j/ um ad.l-odoe0qeeing to the West (-x direction) begins to slow down as it approaches a traffic light. Make a stateool0+ d v+d qmi3e.u+q/v)keeaj -a f(ment concerning its acceleration.

  Suppose that an object is moving with a co3feqn qek,m5 0nstant velocity. Make a statement conce 5emq0nkqfe3,rning its acceleration.

  If the velocity of an object is zero, n * 6p.*m o5kz+f9)tfxjyb mixdoes it mean that the acceleration is zero? Sf ix.+x9j6zb) m *mnkt5po*fy upport your answer with an example.

  Can an object's velocity change direction when its accelkwjm*mo; (n(x eration is constant? Support your answer wito;k(*nmx w mj(h an example.

  Suppose that an object is movi7g)ct0ah53g0ibhulrh r1v ,52ydv nang with constant acceleration. Make a statement concerning its motion with respect to b5u0dghg2iha0 trc1 y5n7rva3, l) vh time.

  Can an object have increasing speed while its acceleration is r tzaiqo- + +xc9ct2n(ag*.oe decreasing? Support your answer with an ex9 rqc+tnz -o*.cx2a eag(t+oi ample.

  Suppose a can, after an initial kick, moves up along a smooth hill of*0 k)jcm : bm+npkkh(e ice. Makebec)pkhn0j k+: km(*m a statement concerning its acceleration.

  Under what condition is average velocity equal to the average of the object4rim pj (*q .p*yrqmr3's initial and final veloci ry4q p*3m.j( imrrqp*ty?

  Objects A and B both start at rest. They both accelerate at the same rfr f7f.jbx4m 7ate. However, object A accelerates for twicm.f47b jx7fr fe the time as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. T,sy)l8pp1 ipoc. a/rkhey both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance /apl1c)s8,ppoik. yr traveled by object A compared to that of object B?

  When an object is releas/(3beqhdvmlm*)qf,q pv,0z n ed from rest and falls in the absence of friction, which of the fobdpfq m(*h/ m,nqv v 3)zqel0,llowing is true concerning its motion?

  When an object is released from rest and falls in the absence ok;ri4pvt 8+x(ey 83x8 irkbcu f friction, which of the fr84;kx eikubi83rp+xv( tcy 8 ollowing is true concerning its motion?

  Suppose a ball is thrown m p:yt p5(9s: usr4butmxz2/ ostraight up. Make a statement about the velocity and the acceleration when the ball m:5xs/p 2b:r ypt zsu4otmu(9reaches the highest point.

  Suppose a ball is thrown straight up. What is its accelera5+t:iepyucu * tion just before it reachesy 5p+uce:i*tu its highest point?

  Suppose a ball is thrown straight up, reaches a maximum height, then falls vj;slit7* i2 bto its initial height. Make a statement about the direction of the velocity and acceleration as the ball is goin ;2iltsi b*vj7g up.

  A ball is thrown straight up, reaches a maximum height, then fallg +rd6lt2uaeje323s. :efo k; hh tg8ls to its initial height. Make a statement about the direhgr2e u; tlo+ e28d6 he.l3g:kfajts3ction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downwd1u 6zwlwhx +l5a./ yward in the absence of air resistance. Make a statement conce+hazx1 5 6wwwy/u lld.rning its acceleration.

  Suppose a skydiver jumps from a high-flyingl)+ s*g.el kdxuapu52 plane. What is her acceleration when she sh *gl+dup ex2 lk.s5u)ae reaches terminal velocity?

  A ball is thrown vertically upward with a speefxyl..8k sqa 9d v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height8. q x9aysfkl. 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.qfw*t l.i.j) -el+z diu i:y-; swa8hx One second later, ball B is dropped from th ;8ia.lf tq-ywl + isx-uj *ehi.:wzd)e same building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, ball B is droy1n8 m5 j+o(ukb,obfzd2 v52zzcbbf4pped from the same building. As time progresses, the difference ibbo5fv o2 2fbz(z j4my51b+8 c,kdunz n their speeds

  Two objects are thrown from the top of a tall building. Onxx tju*a:ti*2 e is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit the sut2xia: j*x*t treet?

  A brick is dropped from the t j7h+xjsb(+dtop of a building. A second brick is thrown straight down from the same building. They are released at the same time+d txjs 7b+(hj. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. Th hnjcbw :z4wg.,,mxp5e position versus 4bpg:w, j nxhw5mc, .ztime graph of this object is

  An object is moving wiy)2p.jzu x32r4+tmr(ch zidc 7i rwg8 th constant non-zero acceleration in the +x axis. The position versus time graph of this oiiurp)m( rcw7c yztr+g2x83 4 .zj 2hdbject is

  An object is moving with constant non-zero velocidx0plmpj qv-g :z1mzp 61 b03uty in the +x axis. The velocity versus time graph of this objectdpmpm1l0vz1gq x jzb03p 6-u: is

  An object is moving wj++/m* kddk8all:/ -w llppxnith constant non-zero acceleration in the +x axis. The velocity versus time graph of thispl8d ka//dk nm:+wl*l +j pl-x object is

  The slope of a position versus time gr2iu,:we ejot4 aph gives

  The slope of a velocity versus time graph g sqq jvl1w2w-,ives

  The area under a curve in. e9 f475-cles2 sz3iilabef x an acceleration versus time graph gives

  The area under a curve in a velocity versus time graph g5 u(,( pf3i(aocwgucgf 3oo2ep(/g tuives

  If the position versus time graph of an object is a horizontal line, the object hlero :8w:7ezisel hze::wo78r

  If the position versus time graph of anv-,w( j3ep pch object is a vertical line, the object is3 ec(ph,w v-jp

  If the velocity versus tbq0,sa lq,c5u ime graph of an object is a horizontal line, the object is uc05a,qbls,q

  If the velocity versus time graph of an object is a straight line making a*e ke *n; h84hsq761fh vnf)su9hfcycn angle of 30 degrees with the time axis, the object is);ve* u1cfhhf s79eqh6h4n fks*8yn c

  An object moves 15.0 m north and then 11.0 m s jz(x/wwra.+s6u9fjs1/e g otouth. Find both the distance traveled and the magnitude of twszujj s t wea(6f./+ox/1g9rhe displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to move pazqc8, /io7 p*oj l,g12 km upstream in a river f,ap , p7*o/j ocgqi8lzlowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609bt iuik+jorg gt*+:ho/6 - 2yg m)

  What must be your average speed in2mlnv al(-xv+e 0kxc 1p6tlxa 8n/-db order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 ht bkbxq/,.y n/ours and 57 min. What is the average speed nx.q/,kbbt/y of the runner in m/s?

  A car travels 90 km/h. How long does it taked7m(a 5 a(cjz 6,aczkd for it to travel 400 km?

  A ly (light year) is the distance that light travels in oh.u7cf a-y0at ne year. The speed of light is7-cu0 hf ytaa. $3.00 \times 10^8 \; m/s$. 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 y: y5 ym9py6hqhou look to the side for 4.0 s, how far do you travel during this inattentive periody5m9q hh6y: yp?

  If you run a complete loop around an outd+4cl9)x w386e-jojnt ekl bt1jx.agm6g xvd+ oor track (400 m), in 100 s, your averag+.btge) jv36-+wxmjdoxje4a1 t6 nlcg 9k 8xle velocity is

  A polar bear starts at the bhx73h6 y8bom)c7 l, kjduic-North Pole. 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.y km,jbhcd3-7lbo)hx6u c7i 8 This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km southe8mhk.ii-r7ws/enr1- w1 zno , then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its st-n rsn m/w1w8eih e.o1 zk7ri-arting 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 for 110 m ymp4borwc 0i l.7uhs7+y kw u.8nsx/*iles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 howicku40+ 7lhs r*ynp. /b7mxoy8u .wsurs and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 10hp.h 7i0wb0 yy0 km/h. What is the average speed of the7h y0pywhib.0 motorist for this trip?

  A motorist travels for 3.0 h at 80 : mjgm 5(h-.v,qndt6 vc)h abgkm/h and 2.0 h at 100 km/h. What is her average sc)5nh-mgq6 atd: (vmj,b v .ghpeed for the trip?

  An airplane travels a 6ovp u,duh qa ktv)/vvfofz+(o-rc6-:tlc5 8t 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average -:t,+a65hvqpod(kv tf)rc o-68 z/lo cuvvuf speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the lasa 8ey2pb3:4izf gq8 vpt 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 le:3 qgpvep84 ybif2 8zaad 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 ac-,dx)ex pd9 3t*2kjj lk8lv cnd comes to a stop after 8 s. The car's average velocity during dece3dd8x 9x ce p-k)j kjl*lctv,2leration was 46 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 aveu u4qfhb(5d: dl 1bw)arage rate of 1 l()d qa4ubh5ub :fdw$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at x5j2jy: ,( jzgb;iu/u 1uuje zthe 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 accelera7ig 36qg, xxrwrc;)h ztes 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+;+y gpfrbwu(- vqk/mlr(r5 v up with a constant acceleration of yv/ r-+bg5wuk l(r+(rpvm;fq $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 3.5 m/s experiences a constant accel4 :3huvvcp)gc luryn6m/hb278 mm u5weration ob chgmyu624mv :8)cvlp/ mnu3 7 huwr5f $4.4 \; m/s^2$. What is the cart's displacement during the first 5.1 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a wl ;g/ks tnh6+.1u(oknv b8j sspeed of 435 m/s strikes a sandbag and penetrates a distance of8v.6+n ksunh wk(gs ;bjo/ lt1 41.76 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launcu f/r0l ,ga;j5p9wps9ip)uafhed 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.s)/a9u;pfr9p a 05gfwju,pli Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant acceleraticz92+xd9kji mon 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 aversl:s cfdog/98d3qro1 40e wgnage accelera94 8:sledng qrg d3o/ of1sw0ction?

  An object starts from rest and uoer nw 7 vyhh6au4jrs))w u10(ndergoes uniform acceleration. During the first second it travels 5.1 m. How far will it )e()s wwjnuoh 07r61 a4yr uhvtravel during the third second?

  An object is moving in a stqc3 a (3lm+b8m9lccd oraight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is q(3l d9ba +3lom8 mccctraveling at 10 m/s. How far does it move during this time?

  A car starts from rest and acce,pe,. ud m51 4gdywdf0smnnx y824xixlerates 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 deh7 1i-, vjkmqedi3+ ejcpyq,3 tv0: ftcelerate at 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 t49hh bfuvwf/9j9n:c green, a car that has been waiting at the intersection starts ahead with a constah4ju9 wth:fnf/cb9v 9 nt 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 va.c7ijocsk. :+vmf+with a speed of 12 m/s on the surface of planet X wheoc v skaj+m.c v.i+f:7re the 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 ouomq:y tlu4. +n the surface of planet X where the acceleration due to gravity:u t+.o4myql u is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upward wig0 zyl. 5nb6du,wn9vm bcs/v*th a speed of 15 m/s on the surface of planet X where the ag 0nm59bsvb,du v.6nl /cw*zycceleration 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 plxyd o 5s3o0xc3anet X where they 5sd x0oxo3c3 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 your friend h,is1)ybkk 8nj hdt f29olds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before,kk9 d1ht fns2)i8by j you catch it?

  A ball is thrown upward at a velocity of 19.6 m/vvpwfeh2fxu498 /j wbrr.rr3 (9fdg 6s. What is its velocity after 3.00 s? d/hr 4rvgfrwbe 6jp.x w(9 3vffr98u2

  A bullet shot straight up returns to itskk 0is m-:,phft-e1dm starting point in 19 s. What is the initiamdep tsimk ,k:-fh0 -1l speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s.5 5sy: f( wzx)myej.o8 dnpgn8 How long does it take toxd) .fmw ej5:ysn(o8g z pn58y return to its starting point?

  A ball is thrown downward from the top of a building with an initial speed oqbgp -ucr 5 :t1: wh3n-bl:sfaf 12 m/s. It strikes the ground aft -nu:g h5l- taqb p:wr1csfb:3er 5.7 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in nus. u5aumyr67v1 ec:bomerical value in the blaor7 ea 61u.5bmuvsy c:nks)
(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 30.0 m/a q3j;:g,r1amk(fkvc p-s6ajw 5aiz3s. (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 13 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 13.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the veloc+ / a1igev odkvry2e7(0fcju1 ity at t = 1.0 s?

  In Fig. below, what is the velockvw+ q+shqn-4 ity at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.0 g0xwvdrfjw/-8/ n fy6s?

  In Fig. below, what is the ve 3ma(6 krggyz*vrpa 21locity at t = 5.5 s?

  In Fig. below, what is the average velocity from 0.j ulp3 v -mmzx57nwh/w6 ip+o to 4.0 s?

  In Fig. below, what is the average ve q pm7+*m f)nzimzc8(jlocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration azfho14t ,)h9y:. l0gthqpzu nt 1.0 s?

  In Fig. below, what is the acceleravaclx*ue( m0kj0yro 1 +paj :,tion at 3.0 s?

  In Fig. below, what is the average acceleration from 0 uedf a/4mo 6a+augti, (-f5roto 5.0 s?

  In Fig. below, what is t-yh/aw)4)3p fq v pfdehe average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8.0 s1fkec9 xrifpf4-x-i l61 *of r?

Does a car speedometer measure speed, velocity? {spec7mv .v8ohtu9,uq*s. )usu d,tsruh 1 ed|velocity}

  An object can have a varying speedg/nc.ro7fj e6 if its velocity is constant.

  The velocity of an object can be negative when its accelera vix.x*n3l9eition is positive.

  If one object has a greater speed than a second object, the first muqys p,,bz5r7mys fx( 0,jsov8st have a greater a s(sop,x5 brv, qyzjfy7m,s80 cceleration.

  Two cars emerge side by side froma;iwvnah9 5 *h 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 inc25nue-ts a /tsxt(b,* e, qjp2r;aoq speed as its acceleration decreases.

  A baseball player hits a foul ball straight up intitb.ib,* z:av qm ;7dxo the air. It leaves the bat with a:7ixd. i ;ma,q*zvbtb 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 happenitnz)an4p i:hdc*)odzu * u:p5 ng to its acceleration, how does it change if air friction is ptdn:zp*c u) niodh u z)*a45:ignored?

  As a freely falling object speeds up, what is happening to its accelerat rfkspakz :az610) x;oion, how does it change if air frictionspaz1;krxaoz) :f 6k0 CAN NOT be ignored?

  An object that is thrown vertically upward will return t,(dm16pd7zz.9xxzeibfpnm-r(h 8 m g o its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, 1f6 8pz,gm p7d9ehrdmmb((xx .nzz- i how will this result be altered?

  An object can have zero velocity and non dly85;-k xn30uvo0xd9pj uz bvxxq/3zero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the saliuwi17h ypkn b c20uly /(hkf-;x;7kme time.

  An elevator moving from the second floor to the fifth floor making no stops aw z+7yo)6v ds0ijqp z5long the way has zero acp+q)sj7izdyovz 0w 5 6celeration all the time.

  A rolling ball moves dm.v09 y *aaiwfrom $x_1=2.3 \mathrm{~cm}$ to $x_2=-7.2 \mathrm{~cm}$ during the time from $t_1=1.0 \mathrm{~s}$ 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 $x_1=2.7 \mathrm{~cm}$ and at $t_2=3.7 \mathrm{~s}$ is at $x_2=8.1 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps ag*j z4 ld. zv7y*uc cva(w,xqet+r,g 1round a quarter-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 86 m away i.iv1aqwvi i7.qxx c 75n 11.9 s. It then turns abruptly and gallops halfway back in 4.6 s. Calculate (a) its average svq75 av.ii7x .qixcw 1peed  (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 d8mlslo8u m/+ $12 \; m/s$ to $24 \; m/s$ 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 fromp rezwk+ck2n;do 0l: e0qm0 l2 $18 \; m/s$ to rest in a distance of 70 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a spbq3 .gztd.t j *ilz06need of $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.1 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out ojb ymlf8e 7;4kf the blocks to essentially top speed about;e74b8 jlyfmk $10.1 \; m/s$ in the first 14.9 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-ks d.+:wzto x/u(s jk a speed of $19 \; m/s$ to rest in 5.54 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 highm mr3w ;.t.fv inqfi91k8q4hmway. Assuming mwt3fr.89vi .h1q;qmn mf ik4a deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truc0eiqb.wd- p zmr4 /;rxk 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).    $m$