Suppose that an object travels from one point in space m+p ym;4em0** pdfbp ito another. Make a comparison between the displacement and the distand+* ipmpm4 em0f* ;bypce traveled.

  When is the average velocity of an object equal to the instantaneousun b0n/)1 c5mug;pxpx bmn- x1 velocity?

  A new car manufacturer advertises that their car can goy-u q/m* 7bwbl "from zero to sixty in 8 s". This is aq*uybw m-/b 7l description of

  An object moving in the +x axis experigdv z8v-v0h8( u6tmban (fv.k- aqt9/nyyox 1ences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow down ahqq1s+-g g smm* f0uw+s itmw 1sf s0-q m+qgh*gu+ approaches a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) bzg et)j2mmxc5e33(yy egins to slow down as it approaches a traffic light. Make a statement concyc 53xe(ym 3ej2tz)gmerning its acceleration.

  Suppose that an object is moving with a constant velocitybbz:zs e4kcg+92dvh02d7llwai *-zk. Make a statement concerning its accelerationzl s h0z7idzl4:2 vkb29w -*b eg+dcka.

  If the velocity of an object is zero, does it mean that the acceleration is zero9x 3bzbo -6wto? Support your answer with an example.x9zt6o- bbow3

  Can an object's velocity change direction when its a+ mord :vc ln+ zsumry)s(-y9*cceleration is constant? Support your asv(u + ond)+r*s: m lrmyz9-ycnswer with an example.

  Suppose that an object is moving wis)7iuz+s mam )b0,8z8f nbv srth constant acceleration. Make a statement concerning its u7 mfs)s 8a+n8)s,0rbzbimvz motion with respect to time.

  Can an object have increasing speed while its acceleration is decreasing? S2z 3l0ea)a iuoa 4uo0;s(rvri upport your answer;4r o0iavu023sior ul)(zae a with an example.

  Suppose a can, after an initial kick, moves up nhaqtv/u +p9 my51 ua8along a smooth hill of ice. Make a statement concerning it9 h+/a 8qmnyva1u 5tpus acceleration.

  Under what condition is av:ksmwadc25h,x 2iig5ju )z j;erage velocity equal to the average of the object's initial and final velw5ii2g h jmszxjd5;2a:),cuk ocity?

  Objects A and B both start at rest. They both accelerate at the same r2u /+0d6wd (w6 e gfljtx4uymko+/pm at-lan;ate. However, object A accelerates for twice the time as object B. What is the final speed of object A c/ uka+tly2jwol egm d/;4tdm 660-wp +aunf( xompared to that of object B?

  Objects A and B both start frz e lw)xnld 3aagu vw953dcj t1mz50.(om 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 obje35c 0.l m9jvd)x( wu3angd a1ez5wltz ct A compared to that of object B?

  When an object is released from rest and falls in thc0 ld mj-xl9v5e absence of friction, which of the following is true conl-9 vxdl50j mccerning its motion?

  When an object is released from rest and falls in t)p3z;n c dv68xipa den,t tb0ad 5)qc,he absence of friction, whichibet ancd);vnct 8, zp56qd3x)a,pd 0 of the following is true concerning its motion?

  Suppose a ball is thrown straig0vpv,xtg8+ nj ekql)py27i7vfk 2hh8 ht up. Make a statement about the velocity and the acceleration w82gvhnj)+ 70 e h ky2vpp8vtx ,qikf7lhen the ball reaches the highest point.

  Suppose a ball is thrown straight up. Wha* 0wjw16b,s6jhmkqkbr, yh g;t is its acceleration just before it reaqw6mbg k,j yhrhw*jk 6;s,01bches its highest point?

  Suppose a ball is thrown straight up, reaches a mj.vs1g),xbq(w ehb2 maximum height, then falls to its initial height. Maewqvj2 )1 hx(bb,gsm. ke a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown str4h d qy9f2rm1uaight up, reaches a maximum height, then falls to its initial height. Make a statement about the dy1r42 qdh fmu9irection of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in th.7t*a hbj 9s,.if5bysbx8 , jpn0fbuqe absence of air resistance. Make a statement cjb0a ssbt8biq.by.*jx n u,h,p59f7foncerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. n ;,h8ug.a4vm u6voz o What is her acceleration when she she r hgau4.onz m;ov,6u v8eaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical secnyuq;,e l5 x,x; gk *cvsz8o,rond ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to x,c;n8 o * z;ulx ger5v,sy,kqthat of the first ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from the to+.e hya8zn w:kp of a building. One second later, ball B is dropped from the same building. As time progresses, the distance between :8.eyw+knz ha them

  Ball A is dropped from the top of a building. One second later, ba x 77)tihhkiz0)hp(corv 5jo +ll B is dropped from the same building. As time progresses, the diffek+ch rojxv) 0zh ()t7poh7ii5 rence in their speeds

  Two objects are thrown8hbnn 93attlazw4l0 .cq9 1.ou*fvo 5 e3d suj from the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit tjodza s0nbvq w u*t.e189 tc3fnaoh953l4l .uhe street?

  A brick is dropped from p- avq go.0+l3ixfx,;zu 8bcmthe top of a building. A second brick is thrown straight down from the same building. They are released atxmp+0xgi83v f-q,u bcz .la o; the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with co pq r:fe),8guhnstant non-zero velocity in the +x axis. The position versus time graph of thu8:gehp f r,)qis object is

  An object is moving with constant non-zero acceleration in the +x axiso1ks (q;sgn2l rzz71ig8y b2i. The position versus time graph of thi7o n2b8z1rg2 li yskiq1;gs(z s object is

  An object is moving with constant non-zero velocity in the +x axis. Thuz3)vn9m6 ,ymdw 7qy ze velocity versus time graph of this obn3m dv,yyu9) z7w6qzm ject is

  An object is moving with constant non-zero acceleration in the +x axis. The veliz/7ur 88/qgng 5nwplocity versus time graph of this objeirw/u g/zp588nqgn 7l ct is

  The slope of a position versus time graph gi6o0 ( , 3vcg/. cau(ptwvnmodxves

  The slope of a velocityi sxy1fe.h5wy zg ;hbjo;s( 0hml8(c( versus time graph gives

  The area under a curve in an acceleraty0 *tpv4liysw)) +dk6gj .km pion versus time graph gives

  The area under a curve in a velocity versus time graph gij5*vvc g* ha sqsk.q+7ves

  If the position versus time graph of an object is a horizo7b6 4qa7qqm90 hybcbcntal line, the object is 77c 40yacbhb b6m9qqq

  If the position versus time graph of an object is a vertical line, the obje7eshd l.a*th3t xg v--ct ist-3.*hh ed7sagxlt -v

  If the velocity versus time graph of an object is a horizontal line, the w+u+hva 2lns:+d8t xkobject ia+kl8w + st2:xnduvh+s

  If the velocity versus time graph of w zx3+aznk z*l.n 5*mgybqp;71o1wu han object is a straight line making an angle of 30 degrees with thyhwkwg1.mlz+zx1 5 znn 3 q ;oau*pb*7e time axis, the object is

  An object moves 15.0 m north and then 11.0 -q(nmr8bh 4lg m south. Find both the distance traveled and the magnitude of the gq b8hl4n-(mrdisplacement vector.

  A boat can move at 30 km/h in still water. How long will it take to movymc6dlfe bo8 r86 qvrbnxv1+*h-,b.pe 12 km upstream in a river flo8.86 xmf+orbhp lve 6ycbrnb- *1qdv,wing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi2e q-ev;1 7w jjy,urif = 1609 m)

  What must be your average speed in order to travel 350 km in 5.g:f37u4ulknw.3 h ic0p jy,uj15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 ho jud.7y1-dvrnurs and 57 min. What is the average speed of then- ud y7jvd.1r runner in m/s?

  A car travels 90 km/h.0. z jx9brn ca90ujtypk06 md+ How long does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in opjufe)f n gk59wb4,.0redik 4ne year. The speed of l4 e,)fi fu5e. n4krbg0jpk9dw ight 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 ed9.xpsrn sz;5w4dw 7-c dgo+ along a straight road and you look to the side for 4.0 s, how far do you travel duw zo5n+sc de7xg.d r4w sd9;-pring this inattentive period?

  If you run a complete loop around an outdoor track (400 m),bcz3y; :tj4n 1uw4wr 95szhk h in 100 s, your average velocity ;h:z1rj9c4w 3kt5s wy4 zunhbis

  A polar bear starts at the North Pole. It travels 1.0 kp18fh5 e5zugu m south, then 1.0 km east, then 1ge h158 5upfzu.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 speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km e,km/ yc q;vvy1pqch-f ;60t zmast, then 1.0 km north, th, 1tmq 6y-hymv/0c;c v;qfzpken 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 ar4q;i8(x n2ull ngn6 d 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 15 minug n4urnn6(ildq8xl; 2tes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/lz,sr:vu k5 8bh. What is the averag ,8v: urlskzb5e speed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 ky-y j9i( urr.wm/h and 2.0 h at 100 km/h. What is her averager(yj wyu-i9.r speed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h ; l24 t kuswa-44sucbdand then at 250 mi/h north for 750 miles. Wh l44dksb -4ac2uwt ;suat is the average speed for the trip?

  In a 400-m relay race the anchorman (the e/ :0wyefrj.u* ckil: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 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 f.y0 /jw rc:e:ule*k ilose the race?

  A car decelerates uniformly and comersd4cm5p1m,ln c0l 1q s to a stop after 10 s. The car's average velocity during deceleration was 77 km/h. What was the car'4cs0 11mld mlcr,qnp 5s deceleration while slowing down?

  An airplane increases its speed from 100 mdj-0w05 5ww8wjjl ryr/s to 160 m/s, at the average rate of 0jwd 8rwyj lw550r-jw$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at t4y;qxn z x,a rwda/+24bpt6wfhe 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 acceleratcj mds5qud 2(i4.o gn)es 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 tjx0 oe-i2 2q ztj )*c:uxlglv+j )q6iup with a constant acceleratio+xtql)o j uc:ile*0i)j 6 -g qzv22txjn 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 2.3 m/s experiences a j9 e2iwhdc+3 vconstant acceleration of e vi+c3d jw9h2$2.0 \; m/s^2$. What is the cart's displacement during the first 4.0 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speq fftp//41 vvled of 542 m/s strikes a sandbag and penf/ 4l/v fp1tqvetrates a distance of 93.52 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a cae 7n1tjmk (5xltapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this reljm(x e1k5n7tquires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with cob+n)w3w (nrgiqr4st tq1c/ t8nstant 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 in a distance of 200 m. What is iiz; 5 nhi9gi7jts average ac5 igz ;ji7ihn9celeration?

  An object starts from rest and undergoes uniform acceleration. During the gyv7dwp) g7jsg3dpq7s * 8(ox first second it travels 5.6 m. How far will it travel du3q 7*) j vy7sgsgo7pgp(8w ddxring the third second?

  An object is moving i n+7igjnm4xeulhpq*q d jq)(0 if2x00n a straight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. d47n0i 2 xm+j p*qhlixf()jn00gqeq u How far does it move during this time?

  A car starts from rest and accelerates uniformly*lw. pn4gin4 b 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 del00g6 jook hz ti02tz0 nn:qm2celerate 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 thatv/ omx xtf.j:h;7oaon3yqnw+m n3i21 has been waiting at the intersection starts ahead with a constant acceleratio1jnyi: +n2f/ x x;hmt.onv a73oqw3mon 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 s4jr xe1-ayb :b (2gf o1+qb :ilhqs9vcpeed of 12 m/s on the surface of planet X where the acceleration due to gravit4+js2 aq h qlyvbcebi:b:fr(go-x91 1y is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward witv 7s (d)hvsn9mh a speed of 12 m/s on the surface of planet X where the acceleration due to gravity i)s m(hnvdv9 s7s $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upward with )y3 o rvwww/9 uh, (/:kkysp.shccf4ga speed of 15 m/s on the surface of planet X whe/h kcw93kc4:)g (fhsrwp,y/s y.vouwre 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 planet X wheh vdj oduz m,,(a,7gf*f,zud*, (vgd ,7hj maore the 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 greateuzh7p7zjxs h55i5y t+ld0 u5 dr than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you catcz7 px5h0 y5tzls75ddiu5 u jh+h it?

  A ball is thrown upwak,ww ;vrpumg++zrl9 .rd at a velocity of 19.6 m/s. What is its velocity after 3.00 s? kv9mu;rpw.l+ +,zgwr

  A bullet shot straight up returns to its starting point in 16 s. Wh qt2. n.vt ghfndd;h9 101knoxat is the initial2t11 ndt0qfgn.h;hon dk9 v.x speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it take t 9(eqx;dyo-ed o return to i(y oxd -;deqe9ts starting point?

  A ball is thrown downward from the top of a building with an ini;5r px6 yc,dujtial speed of 24 m/s. It strikes the ground after 3.6 s. How high is the buildingj6pu;xr,5 cdy ?

  A ball is thrown straight up with,/4moo 3+lvk0d liajr a speed of 30 m/s. (only fill in numerical value in tajm3idl+or ,4v 0 kol/he 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 o- apklk jy+n6,xmu(bwg w17r ;f 30.3 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 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 velocity at t =c8,in9jocgtn 3a:a4 mfgo* 8x 1.0 s?

  In Fig. below, what iw(ezw5* ldvs3s the velocity at t = 2.5 s?

  In Fig. below, what is th9b/k* g,5wkljm.3 vwlk:hm rpe velocity at t = 4.0 s?

  In Fig. below, what is the velocity at udb3 2wo)f *,rfd opx+t = 5.5 s?

  In Fig. below, what is thz2yk),.g(l(wpyakx(ue97 fw/nmp f te average velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6ue4q (lfazq96.0 s?

  In Fig. below, what is the accele0 fe rg,4kcgqj :pu50oration at 1.0 s?

  In Fig. below, what : 2qzp9m.ani5phu o -mult2s-is the acceleration at 3.0 s?

  In Fig. below, what is the average accelerats43rd sk4+ 85;cnjh7aflu r c: cwtp:sion from 0 to 5.0 s?

  In Fig. below, what is theaxned g-. 0a2ta7d :cs average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8(vs vm6s st. x6gqgd xz;;6lh(.0 s?

Does a car speedometer measure speedlz30j w ugkgv(p *l+j6:jps6l, velocity? {speed|velocity}

  An object can have a varyn:m* 8xz)ugozk)67yzgbn t,i ing speed if its velocity is constant.

  The velocity of an objectz3sp rc ,4vh ad(5cv0i can be negative when its acceleration is positive.

  If one object has a grea448c/nf9de d) esabb nter speed than a second object, the first must have a great98n bnsa/ef b4)4dcdeer acceleration.

  Two cars emerge side by side from a tunnel. Car A is trnsndt2/1yw 7qmwyoh z hecyu0(pmg1 -p84 * :haveling 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 incqys;w9k72 q,;aa+zsnx* qlxn 8x( gojreasing in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It fj9bnnsa *0u: leaves the bat with a speed jaf*n9b :u0 snof $120 \; km/h$. 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 a/1m*8kpkq9m0 h ctcx ncceleration, how does it chk*c9cnxt1 h8/qk mpm 0ange if air friction is ignored?

  As a freely falling object speeds up, what is happening to its accelerakn83 e-9epi bn)rh *c5m; bxhvtion, how does it change if air friction CAN NOT*h;)3b nemc8h5pixr v-nk9b e be ignored?

  An object that is thrown vertically upward will return to its original posigeeqpp 4 bla+nx .ro;fe4e*s66bul1+tion with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be a +og4+seupeqba4e*nl ;epl6x 1br6 f.ltered?

  An object can have zero velocity and nho2h cktab 1 5klvqk7r8y8z4)onzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleratibhz.6kayj- (n eey 6:xon at the same time.

  An elevator moving from the second floor to the fifth floor making nf sve/0)ip1y je6zos: o stops alongpos je ): fve0zsi/y61 the way has zero acceleration all the time.

  A rolling ball moves fr*-ur :j:pmk .bojpo ph9o.4unom $x_1=1.9 \mathrm{~cm}$ to $x_2=-7.2 \mathrm{~cm}$ during the time from $t_1=2.5 \mathrm{~s}$ to $t_2=5.9 \mathrm{~s}$. 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 $x_1=2.5 \mathrm{~cm}$ and at $t_2=3.1 \mathrm{~s}$ is at $x_2=7.9 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps aroundp:cw 8 qd8dv on wgh+t;s408bp 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 i8t-h8 tor5 j.yjbq0kp + slay(ew46sits trainer in a straight line, moving 109 m away in 10.8 s. It then turns abruptly and gallops halfway bb( +jt48 sakslp850wqi o y6tjh-re. yack 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 frot/tf c*ic6:ju(bx do*m $11 \; m/s$ to $23 \; m/s$ in 5.7 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 fromwsy:j(f k1k;p $18 \; m/s$ to rest in a distance of 72 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed of h jj7o+t )k f3l*nq49 iyzw(zx$27 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.0 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter canc,e qsz+6le 5dw.gqt3 burst out of the blocks to essentially top speed about,.ge36d5+ eqtzc q wls $10.4 \; m/s$ in the first 10.1 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 uniformay-l4qg,l2 fv8wsfvf w2od ;(ly from a speed of $20 \; m/s$ to rest in 5.36 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 thehuj.qxzrm).45 ij d+e highway. Assuming ard +h4.um5j) ei .xzjq deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a tr wd+ c:.1.zgl9lbih o4jzh oc3uck 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).    $m$

  A runner hopes to complete the 10,000-m run in less wdtu-- hm 45wf(8qi sp+i7a uzthan 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must th+wu7(ufa 4 m8t-dp5shiwiq- zen accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$