Suppose that an object travels from one point in space to another. Map- + ocm+zo, xq+ i9ysmh6g6xj s*v2 njoncg62ke a comparison bn2*xmxjpcjgoo ,6s9+ nsog6 2 qc+v+hi-6z y metween the displacement and the distance traveled.

  When is the average velociuk mus dkzjcl,y7qd +-:8vp ()ty of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from z y4e9 j+9nf3rb- jffkcero to sixty in 8 s". Th9f4fefy+ j-bn r9cj3kis is a description of

  An object moving in the +x axis experiences an accx bwv;x1 x9sod6cb-jabos1k n/z9 :f5eleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x dcv7 va o274k8nepdety g.hx:6irection) begins to slow down as it approaches a traffic light. Make a statement concho8pg 764ce:kd yv. 72 xtaenverning its acceleration.

  Suppose that a car traveling to the )zikbwu3s c6s qa:4 5kWest (-x direction) begins to slow down as it approaches a tra5 c z3w:sa4ki q6s)kubffic light. Make a statement concerning its acceleration.

  Suppose that an objelfut;+.h+yq b4nbp g;ct is moving with a constant velocity. Make a statement conc qp+ u;tf;gby4.bl+ hnerning its acceleration.

  If the velocity of an object is zero, does it mean that the acce.k zkwkr34 yd6leration is zero? Support your answer with . z4kk6y3dkrwan example.

  Can an object's velocity change directionfm(:cb nh81u m when its acceleration is constant? Support your answer with an exampf81bhc:m m( nule.

  Suppose that an object is moving with constan5psexu h7nz,r n 4cm3(c3lj0ot acceleration. Make a statement concerning its motion with respect tom 73ucr3h,e(l0zx on4 snc 5pj time.

  Can an object have increasing speed while its acceleration is decreasing? nwz (9g t ffv71t-w*azSupport your answer wit1a t9fg-z7vnfz( w t*wh an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. :3sr, b0-lgkoz3sxlk Make a statement concerning its acceleratio 3gx- kl0:s ,rozlk3bsn.

  Under what condition is average velocity equal to the average of the object+0xqj6 5db6;i xd qhfrvx y-/x:/ur fp's initial and p/56bu6x dry v/j0d :f xrx+q-hq; xiffinal velocity?

  Objects A and B both start at rest. They both 7;sq xbhegoc0b7mhn 5- p )7hwaccelerate at the same rate. However, object A accelerates for twice the tim)-b0n7 sgx57e7hocm q hbpw h;e as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both startd gw; /5p,oj. qyr5ivv from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by pw, y.voj5q gv;r/i 5dobject A compared to that of object B?

  When an object is released from rest and fall sv) saf+t1 sl,;ied/cs in the absence of friction, which of the following is tr1+fa)ssd/ vl c;se,itue concerning its motion?

  When an object is released from rest and falls in pwg4ey)a*osg sqoqs5z2u5 o +30a0 xsthe absence of friction, which of the following is true concerning itssspsaw052z4 qog5xsq a*+g 0oey o )3u motion?

  Suppose a ball is thrown straigho 5(z*+t;q-bs,qzpc l,knkf ft up. Make a statement about the velocity and the acceleration whe-k +,s,pnk5(tbfz; f lzqcq*o n the ball reaches the highest point.

  Suppose a ball is thrown straight up. What isa mh;rp6ja*)ufjm 0. n its acceleration just before it reaches its highest pointf; .ja jm)muph06na r*?

  Suppose a ball is throwztf1;7d;s o5 qxlc7 mjn straight up, reaches a maximum height, then falls to its initial height. Makeqlj7t f;mx5 7scod1; z a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height,ed81 mve gw 1;;dpil6q then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball ispd 1;eq dw;186vgi mle coming down.

  Suppose a ball is thrown downward in the absi-trq dg,+6cy.q3yfp ,b8 ok cence of air resistance. Make a stateme8 pq.ytc y3g, +f,k-bqo 6drcint concerning its acceleration.

  Suppose a skydiver jumps from a high-ft6,r lbcl x52flying plane. What is her acceleration when sher 2tllbf,5 6xc she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An eq67bcpt;rxo1q l01twe v /) qidentical second ball is thrown upward wiqqet;/1prxo 6tv q)c0bl 7e1 wth 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 first ball?)

  Ball A is dropped from the top of a gk qa- c,8gno,building. One second later, ball B is dropped from the same building. n k oagg-q,c8,As time progresses, the distance between them

  Ball A is dropped from the top of a building. On ulnijdp4)4 uo7s +vr+e second later, ball B is dropped from the same building. As time progresses, the differencvr44) 7jpolin+ +usd ue in their speeds

  Two objects are thrown from the top of a tall building. One is thrown up, a*us 9. 74xqmuhzpo n5dv5- eohnd the other is thrown down, both with the same initial speed. What are their speeds when they hit thv u7xhhu-9 sd5zpe.m qo5on 4*e street?

  A brick is dropped from the top of)cgb nx;ll*; lq3,ym q a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compaqq3yb;;,gxl*l ) lm ncre the accelerations of the two bricks.

  An object is moving with constec1z+irdr45l.bpg(w ant non-zero velocity in the +x axis. The position versus tim45z d1g+rpb.(r wel cie graph of this object is

  An object is moving with c b-ruagqx:.1q6 ipx neoo5)1qc ce* 5qonstant non-zero acceleration in the +x axis. The position versus time graph of thisb5oc6 qer-qxg5: *qapn)eq. 1c1 xuoi object is

  An object is moving wi.x s w hwc4 v:t*veeg9;3lyv3xth constant non-zero velocity in the +x axis. The velocity versus time graph of this o ;.y93*tc3hvwxx gw l4ve :vesbject is

  An object is moving with constant non-zero acceleration :.)m0faq oj8h:m zwi hpf)(uh in the +x axis. The velocity versus time graph of th8:pq)( f .h:uzhomahw ) ij0mfis object is

  The slope of a position versus timwa6dgn2 h:ix; r: uw2le graph gives

  The slope of a velocity verjj/8mhp0 y- y29aqzg msus time graph gives

  The area under a curve in, /ukq( l cb0gu 0r/yqtwi9oy. an acceleration versus time graph gives

  The area under a curve in o(l niw0 /wyuy /ur1s5a velocity versus time graph gives

  If the position versus time graph of an objectbp2ss0ymsbfap:(-t2 wjetyx 299sp( is a horizontal line, the object issp:xb9jb2 s-9p 2tt ay(ysefw02ms p(

  If the position versus time graph of an object is a ve +sy m)5 8y9d.azgyieortical line, the object isdo) i m+yez8agy5sy.9

  If the velocity versus time graph of an object is a hor y*(bd7qbay/qx6b)pq izontal line, the object ibxy7 *q6qb) ba/qdp (ys

  If the velocity versus time graph of an object is;m0pjy tn6w+mir-+ 6y62plynf:d c n e a straight line making an angle of 30 degrees with the time axis, the object isnp:m l jye26t6nry+ci+d6n fm; p0y w-

  An object moves 15.0 m north and then 11.0 m south. Find both theewkwy a); .xq4 distance traveled and the magnitude of the displacement vectoak.yew) ;4qwxr.

  A boat can move at 30 km/h in still water. How long will it0 (9ykt8 dutc/afi4 k+ml*r q c7tfp1i take to move 12 km upstream in a river flowia rii 4dy1l+tutqckk7 c 8tf0m/*p9 (fng 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 160j lnhj+ +zi7-b9 m)

  What must be your average-hj8lazgk ;jn ()zxd+ speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximatelh ju43wvv,l1;g i* qosy 42.0 km) in 2 hours and 57 min. What is the averagluhvi1,4vwq;g *3js o e speed of the runner in m/s?

  A car travels 90 km/h. How long does it take fn 4 s.jigt,x,ks8 d3 x9wjxn0bor it to travel 400 km?

  A ly (light year) is the distance thata2;*9ayx(oso 0wnhia light travels in one year. The speed of light ia so0ohx;9a*w2ia y (ns $3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

  If you are driving 72 k,10b)yy udegm m/h along a straight road and you look to the side for 4.0 s, how far do you travel during thisgybu,dye 1)0m inattentive period?

  If you run a complete loop around an outdoor track(ifvhi p(q 3l/7yft;b (400 m), in 100 s, your average velocity i(3ifh 7lvbt i /y;pf(qs

  A polar bear starts at the Nort.s3g(pr35/ fah2 rok1ltc ed vh 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. This trip takes 45 mc3pd 5/ l(ae g1r2 fvhtrk.3osin. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 18mlz*aczbz 1);9wb fz .0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its)zbw8m *c;lzzz af9b1 starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a wgf56ka ;*lmcmn mj31 5c;k jedeekend 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 hometkd*jc1akjlnmc 56me g; ;5 f3mown from school?

  A motorist travels 160 km at 80 km/h andq.e6x ja;58m v+j)ltkx*mzhf 160 km at 100 km/h. What is the average speed of thaqj5k vf;m +l j)he6mz.txx*8e motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km 8 qm1i:sdic+yp,)t xw/h. What is her average speed f1wqisy:xpi 8+ ,dmct)or the trip?

  An airplane travels at 300 mi/h south for 2.00 h and thdudp br/k(1 6jen at 250 mi/h north for 750 miles. W6p ubrdd/k1(j hat is the average speed for the trip?

  In a 400-m relay race the anchoraf)rpj3 t:(orman (the person 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 largestt j aor:fp)r(3 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 stop7 ao-hwtxwhal+f 2: 3a after 12 s. The car's average velocity during deceleration was 33 km/h. What was the car's deceleration while slowing down? a: h-oa+w lx2wa3tf7h

  An airplane increases its sp3ie5ywsi8, o beed from 100 m/s to 160 m/s, at the average rate of wi8os5yi,e b 3$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate nqt :-( fwetd vrw-;3 b+cau+ x/b3sabof $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and accelerates at 5ww fw,p, (clp$4.0 \; m/s^2$ 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 with a cons)jx brgln9)miy3ha;0 tant accelerationyni ljg)b)3ma0r9 ;xh 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 2.0 m/s experiencezi-h(c n(5wk yd-.x(7o c oyz1ep:vkss a constant acceleration ozo w cikezdvnk.(yco-s7xp ( -h y:5(1f $1.8 \; m/s^2$. What is the cart's displacement during the first 4.5 s of its motion?

  A bullet moving horizontacru hlwn( ,0,cvcl o9,l3 w4fplly to the right (+x direction) with a speed of 574 m/s strikes a sandbag and penetrates a distance of 79.05 cm. What is the average acf 0,,pclc,9 ( 43vlhw rluconwceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft 7fu)gym)47q avtj1 iy 67ohyd carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceler6 m7g4 hj1iqad)7yo7 tfuvyy) ation is constant, what is the length of the catapult?

  A car starting from rest moves with constant acceleration of2 *p5qvii0 o1won-f 3h bcxe)i $2.0 \; m/s^2$ 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 e8lh4qjih: av1 s wb7l7vy30 fdistance of 200 m. What is its average acceleration vb8jasf elhh3i4 w :l0vq1y77?

  An object starts from rest and undergoes uniform accee/b - 8; 6jgfxszkias0a1jp juc 7y0j6leration. During the first second it travels 7.2 m. How far will itf7j0-1g;zxjjucasjsi kpe / b 0y68a6 travel during the third second?

  An object is moving in a straimjt fw/b+*bet d 10x1xght line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does1x*d0 fwmb+/1xe ttbj it move during this time?

  A car starts from rest and accelerates uniformlyg( :u/w/z5xcuufa s(4apxp o / 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 decelei-rzcj gjt. 5,rate 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 green, a car that has been waitin w5txbuo ,tq*5t2*hlig at the intersection q5hbt w,*lut t2x5o*i 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 s9;( xf+ l9rcbr( i;eit rlmxc.peed of 12 m/s on the surface of planet X where the acceleration duerli;(f.x +xber il crmct9;(9 to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown hsdajxl mi. (/ w*/q/eupward with a speed of 12 m/s on the surface of planet X where the accele. j /imqe*wsl(a/xd h/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 the surface kp o5o;gnx 0s6of planet X where the acceleno6 k5 ;sxpog0ration 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/qq(7jxxe 80h is on the surface of planet X where the acceleration due to graviq(xx0e7i8hq jty is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is u+kmqal:n 5(yx j9 vjc7:ot9atlr45mhsually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without wak5xlhl97o9:j a ytn:tmq a+r4m(5 jcvrning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward anmt)udq 41 gkoy,k.f 9x f82gx2) aopnt a velocity of 19.6 m/s. What is its velocity after 3.00 ko9n1kq .xxg 4ma 2fyn)du2) 8o,gftps?

  A bullet shot straight up returns to its starting point in 15 s. What isx wm0iz0c7qy9;i:wk(mbg uul-xzk/w04 3p y x the initial speed of kz7/xy ; :ulm 0g3 wi4kxqwz9wuc(byip m0-x0 the bullet?

  A ball is thrown straight up withq ya ,r10fh5;sx,qafh a speed of 36.0 m/s. How long does it take to return to its starting point0hfaax, qs,f ryqh;15 ?

  A ball is thrown downward from the top of a building with an initiaeu,)nitsjxml g/4 j2ne 34wz )l speed of 11 m/s. It ste/nzlie mw ,4gxju4s tn )2j)3rikes the ground after 5.2 s. How high is the building?

  A ball is thrown str:dt9s k+oz, kqxui25jaight up with a speed of 30 m/s. (only fill in numerical value i5:dij9o usxt+ 2k qkz,n 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 straiggwxx/ +o 1,ahght up into the air with a speed of 26.8 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 6 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 6.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1.0c)iji 4 i3q*tg s?

  In Fig. below, what is th 4z 8vu.vbhb u6 k2gdw.2j3xoxo)jjt,e velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t =f (hpc2,2ib- yo wemk0 4.0 s?

  In Fig. below, what i, jv8 i42+0cnzr hqpqvs the velocity at t = 5.5 s?

  In Fig. below, what is th3 r*fca6exo.i3 yzb-x e average velocity from 0 to 4.0 s?

  In Fig. below, what is the average r8is t6y0 fu3agsr9z. velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1 9tlgoeyuk7e oo:n , h(d5fm81.0 s?

  In Fig. below, what is the acceleo)ouyi4p0.x - j) mgmaration at 3.0 s?

  In Fig. below, what is the a5p*aqq9 j )oaqverage acceleration from 0 to 5.0 s?

  In Fig. below, what is the aeyj3x-i5t 3vq*2 rr bxvhr.u;verage acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacemen9p1xs2y1k+tfnek- e zt from 0 to 8.0 s?

Does a car speedometer measure speed,8xv2ge/h 7gdj o7fj-s velocity? {speed|velocity}

  An object can have a varyj9-fg(m6 uc 1yuz nly;ing speed if its velocity is constant.

  The velocity of an object can be negative k qv5poepfs- at f5tw2:3* st7when its acceleration is positive.

  If one object has a g+:j 8czt)wyp15pi oz/kt.xj creater speed than a second object, the first must have a greater acceleration.cj cwjzpt+8)t.yzxoki51 p: /

  Two cars emerge side n5mx g:rp.8r y ;lz:9 hldv/l9tu5oqlby side from 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 spe6frz45muqq azng+ e --ed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the; o1ofpi 0lbo:o+5ewe air. It leaves the bat with a sp:oloi1o ;ope5bw+f e0eed 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 happen ; jeekzuo-.sf*fd+2 j ;+clwcing to its acceleration, how does it change if airc dk f+ufo2esl j-ejc*.;+;wz friction is ignored?

  As a freely falling obg) 8ydrkbrq;s;uy 1vc/u /,is ject speeds up, what is happening to its acceleration, how does it ;/gyiud,/;8vyq1kcu )sr r bschange if air friction CAN NOT be ignored?

  An object that is thrown v/q yqcj/x- 1ck., fiagertically upward will return to its original position with the same speed as it had initially if air resistance is negligibxaifq1/ cj cyq-/.,kgle. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at the same timd bt0bgcb 40(omp0t;ee.

  An object can have nonzero velocity and zero acceleration at zvw-)d1igf;tp kt cv5y/8h dxn h5(c; the same time.

  An elevator moving from the second floor to the flf +0fd8 ylfw.fa8oy*d s poxs796fj2ifth floor making no stops along the way hl ff.f y8ay*wsjf89d6od2 f 70s+opxlas zero acceleration all the time.

  A rolling ball moves frotd uo7 xk f7r/i58lg+dm $x_1=1.9 \mathrm{~cm}$ to $x_2=-8.7 \mathrm{~cm}$ during the time from $t_1=1.7 \mathrm{~s}$ 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 $t_1=-3.3 \mathrm{~s}$ is at $x_1=3.2 \mathrm{~cm}$ and at $t_2=3.5 \mathrm{~s}$ is at $x_2=8.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-milj mu e49 lp;9+s7jph b*v qrs-)rq(icde ($1 \; mile = 1609 \; m$) track in a total time of 9.8 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 108 m awayh-r0 d;lsujx ( in 9.7 s. It thenx-(;ul rsdh0 j turns abruptly 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 froh2rlj: 5xs/)ahe3s kp2xt;asm $11 \; m/s$ 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 from gq1 duye1-(qxa 0lyc/bxtcv1;0 zcb ,$22 \; m/s$ to rest in a distance of 57 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach aczk 3d85pyoi v5lxb3s.6ev;flh1 . vo speed of $30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.5 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can ba;n :a8uk8h, gacby(kurst out of the blocks to essentially top speed about (g; ,8y:akb hak8na cu$10.8 \; m/s$ in the first 14.5 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 y815 e klp8z/hrvik ;tspeed of $17 \; m/s$ to rest in 4.55 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 on9 jey3g +1vejh the highway. Assuming ehj9eyv1 3gj+a deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck zqyoql )-vd . 3mka3c7going $25 \; m/s$ 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 exactl7 eh4l:uljre0 : axp uuje24j0z)peivu mz5 89y 27.0 min, there ar:j)upza04j 9xh05luee 8 u:pu4vmlieje r72z e 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?    $s$