Suppose that an object travels from one point in2h;2hwb6 r lg8zzmlb 0 space to another. Make a comparison between the displachlb r z0h6w;l2g 8z2mbement and the distance traveled.

  When is the average velocity of an object equal to the instantaneous velocha,n14caxc 6)jh6h m,6brobu ity?

  A new car manufacturer advertises that their car can ga*q*cf6 mqb7** g4hclfhmn)az pj )l-o "from zero to sixty in 8 s". This is a descriptiojham p-lam*7bn**)lf qfgqzh) c c* 46n of

  An object moving in the +x axis syu.l7vlcl 9 q8fr+m7 experiences 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 sj)qax i(m 4nk aq1xx0h7 q3xkj4u(3u+rk3zzjlow down as it approaches a traffic light. Make nx4zjxi u07kj(kumq3z 3xhr+ 1 kq4 (xjq3aa)a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow down as 5h kj fiotzbt sj v19+z6:0kc,it approaches a traffic light. Make a statement cotoj1,z k 596:fhksbtijz+0 vcncerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a s5hxuxg338 js *q(zgqjx1ia*xsm) ,jt tatement conceraju,15 qxsg*(xj gj) sq8mx3* i3htxz ning its acceleration.

  If the velocity of an object is zero, d ed298ei435t/oqhna -ymihh does it mean that the acceleration is zero? Support your answer a-yq d29d4o/iteh3 ih h58nem with an example.

  Can an object's velocity change direction when its6ozpjxbcn8x y*b2lyf6m,m 7 * acceleration is constant? Support your answer with yzp nom bf, m8j6*7 lbx6y*xc2an example.

  Suppose that an object is moving with constant accow h);j 6j,lribjm /9heleration. Make a statement concerning it;jmwhhj)6 b/9ilr,j o s motion with respect to time.

  Can an object have in/;hq/buhon6 j a0c6cacreasing speed while its acceleration is decreasing? Support your ; b/a/nouhh6cc 0 aj6qanswer with an example.

  Suppose a can, after an initial kick, moves up along a;j k(hdq6a*p - icdrs2 smooth hill of ice. Make a statement concerning -psa 2ijd c*;kqh6(rdits acceleration.

  Under what condition is average velocity equal to the adumsg2xo l; .fq6(* ngverage of the object's initial2 nq x dggs;*6.mulof( and final velocity?

  Objects A and B both start at rest. They both accelerate at the same rate. Ho 0 wui(3j)dcjbwcdj j3wi (0b)uever, object A accelerates for twice 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. Theni+w8 , 6ewqim01stavy both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A cot i0wwva1+ is,me86 nqmpared to that of object B?

  When an object is released from rest and fal3ln63.nqu q5ry qp 2kxls in the absence of friction, which of the3 53nx k.2pr6lqq yqnu following is true concerning its motion?

  When an object is released from rest and falls in the absence 5 /aknq*hv cs,wre /pv2/gtk .of friction, which of the followinc.n*hg5 qv//wve/ rt,askk 2pg is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocity r fy:s3b*q(mf and the acceleration when tfy s( qm3fb:r*he ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleratg, shh3qja py ir ar*f5unc5 */06 sbfh)cvh;1ion just before it reaches its highehbrip5a cfc/y)shj*h ;v6 nrq51a3ug0 s*,fhst point?

  Suppose a ball is thrown straight up, reaches a maximum height, then falls tr ju75yy,y xp51d udz2y0bf(fo its initial height. Make a 5(y5 fy0uy7 fzr,y1jub pddx2 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, then falls to v5 jw:c5lvp2iits initial height. Make a statement about the direction of the ilv pvw5:j c52velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air re 3cmbkx-tps 2sk0s.bmv8 ,4j jsistance. Make a statement ckx2 0p.ct48,jbmk- bss3 jmvsoncerning its acceleration.

  Suppose a skydiver jumps from a high-flying rp k at764 lcy/bv9c+zplane. What is her acceleration when she she reaches terminal b 7+r6cvk9ltypc 4z/avelocity?

  A ball is thrown vertically upward with a jptmfkd 89; ,yspeed 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 ;d89yjpf,kt m 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 zj2p2/i7n xzoa building. One second later, ball B is dropped from the same building. As time progressezx /2zo7nj 2pis, the distance between them

  Ball A is dropped from the top of a building. One second later, bal.y y:wsom7: ybl B is dropped from the same building. As time progr bysymw7:y.:o esses, the difference in their speeds

  Two objects are thrownfj)sh-a *z+b1f zv g w;xe-po6 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 whe) zh 6 *w;s--+avoeffjgxzbp1n they hit the street?

  A brick is dropped from the topdhrwts x(-*)d of a building. A second brick is thrown straight down from the same building. They are released at the same time. wd*h)tx(s-dr Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The p+4 kq7krx mnk)osition versus time graph x4m rq7k+nk)kof this object is

  An object is moving with constant non-ze0-* l qltdyjxz*u5vp. ro acceleration in the +x axis. The position versus time graph of this *zuy*t0vqx 5j-.l ldpobject is

  An object is moving with constant non-zero velocity in the +xi di*.wi8y3s n(-3v5 uaaxohx axis. The velocity versus time graph of this objehi5u- syw x8ai*3vn .di3oax(ct is

  An object is moving with )*h sctbd,:o*b8d wbfd688b/jwwsoe5k(cj g constant non-zero acceleration in the +x axis. The velocity versus time graph of this object beofjkw b t6cdwjh*8wbd8 *:8 ssbd5 ,/( go)cis

  The slope of a position verst6*v h)vh (oqeus time graph gives

  The slope of a velocity versus time graph gh xooj9)o l3u6n8guz:ives

  The area under a curve in an acceleration vroj.ftkcl6zn5z)d u2n (d6 i3 ersus time graph gives

  The area under a curve in a velocf(jj o):*q n/5nvztwiity versus time graph gives

  If the position versus time hx4q . p3ip-2du j/p2 quu:wq/uyf,lzgraph of an object is a horizontal line, the object ipp4 x/uq:z/dpu jq2w3, l2yu h.if- uqs

  If the position versus time graph of an object is ai1srry1 wsxtfhxq-9 l,vr* t8n)4nj5 vertical line, the object is)s19x1 nn rxftw5vr4-irqyl j th8,s*

  If the velocity versus time graph of an object ipy6 e rdybno)8mra5qw/p7e6rpk* w 1:s a horizontal line, the object m pror5qwn 6a7/kb dp eew*rpy)186y:is

  If the velocity versus time graph of an object is a straight 5kj pgdm qg490uxo)8h* ar*lwline making an angle of 30 degrees witapl j* 5ohu4gq* 80k)rw mxd9gh the time axis, the object is

  An object moves 15.0 m north and then 11.0 m s 9ii.mpga+xp2outh. Find both the distance traveled and the magnitu+gpm9 .xapi2ide of the displacement vector.

  A boat can move at 3 qg -ip-2lzg /pa82o)k; 3bgjxm i5ikp0 km/h in still water. How long will it take to move 12 km upstream/gz-k gbjgpl-52a) ;i2 ikxq3mo8pp i in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? edgg -umny(x f++t; +n(1 mi = 1609 m)

  What must be your average speed in order: nn1+ 9 mxj-d(ze gu7a8zppqt to travel 350 km in 5.15 h?

  A runner ran the marathon (approximar0qw,ktt2zl3 sm j1 m*tely 42.0 km) in 2 hours and 57 min. What is the average speed of the runner in m0,mrtw qs2 jk3l1m t*z/s?

  A car travels 90 km/h. How long does it take for it j.i3j a424;0x0s xs-dcb )ur mhi;lmlf ddk4bto travel 400 km?

  A ly (light year) is the distance t etojwzn:-( )a iya1-ehat light travels in one year. The speed of liaonyee- a1 i:-wt j()zght 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/ phy+)s;y5a;f sy:djy h along a straight road and you look to the side for 4.0 s, how far do y p5)sayjy;f d+y;s:yhou travel during this inattentive period?

  If you run a complete loop aroz:ygv, 0 /ouf so(ubs. v6yj:iund an outdoor track (400 m), in 100 s, your avera ji 6fg/zuosv ub:(o ys:0vy.,ge velocity is

  A polar bear starts at the North Pol-q s72 koze en)wys-.(r ytd7fe. 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 min. What was the bear's average eqdt-wn(zr 7y7so- fky)2e s.speed?

  A polar bear starts at t1t2td 0 vnqmc.he North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, themvqt.n0 cd2 1tn 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 .:z+hjk ,hlvq 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 minutes. + zqlj hk,vh:. 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 tg ij8z/l;oe67 d,a.8mcfgiczhe average speed of the motorist for t/8z,ci;j7ci o 8meg.f6la gzd his trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her au hro7 ;fqg 5o6zrt2)rverage s72grotro qu zr ;f6)5hpeed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north , bsf-(; qosuzfor 750 miles. What is thb, u-oz(;sf qse average speed for the trip?

  In a 400-m relay race the anchorman (the person wh8ojn 1- -cc0 vmz2uckjo runs the last 100 m) for team -ujvcoc n1 -k820jmzcA 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 lose the race?

  A car decelerates uniformly and comes to a stop after 13 s. The car's average vxm:3br tpp ,/gelocity during deceleration was 55 km/h. What was the car's deceleration whilrtp,/xp3mbg : e slowing down?

  An airplane increases its spexv,r zpt q7fp.r6v/5led from 100 m/s to 160 m/s, at the average rate of qxtrlp57f/vv zr.,p6$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate ofa, *4ppwdhwgdj8 q.6r $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and8w 5;rvq+:l zlzsd5pudc nk0 0 accelerates 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 m(hgmqe ka0w/ my8kos uj78,;m82y kxwith a constant acceleration 0 gy8kem j hyk,2som8 qa/; 8m(mkxwu7of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 6.8 m/s experiences a constant accgv ts 867xswq8eleration o 86svgtxq87swf $2.6 \; m/s^2$. What is the cart's displacement during the first 4.8 s of its motion?

  A bullet moving horizontally to the right (+x direction)3y;j ybc kj7-h) yid3m with a speed of 331 m/s strikes a sandbag and penetrates a distance of 98.58 cm. What is the average accelerayj ;m)ckbi-h73jd3 yytion, in $m/s^2$, of the bullet?

  A jet fighter plane is launched fromrh,bf.o2.3wbbi 5u/ ; hlod bi 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 constanou/2.i 5,3r;w.l bi bo hdbfhbt, what is the length of the catapult?

  A car starting from rest moves with constant accelerl jz5ygm bm,7td k9k0fkt5w 50ation 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 itongnz8r40 f; bs average accel8fonbz ;n0gr4eration?

  An object starts from rest and undergoes uniform acceleration. 3 phj139bibs mDuring the first second it travels 8.2 m. How far will it travel during the third secobjhm3p13bi s9 nd?

  An object is moving in a straight line with constant acceleration. Initialwq2y:io,xs.yqlz8;z*6 wnix9mcu 8 m.z2f bxly it is traveling at 16 m/s. Three secox96 .yz mczx;f l:o inmx, *q 2qu8.wzyb8s2winds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and acceleratesshqf2 : -lnxrl/yw p9fpr;s88 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,-fd :a cf:aiwd7w:j whwttb8k rs9ko+::i;i 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 c 6)d 4b aearzqu7ko:5hpr,hw7ar that has been waiting at the intersection starts ahead wi477 ph:dwqrhoaez),ur a6 kb5th 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 of 12 m/s on the surface o :y jvxx,n ;;hi(zaj7nf planet X where the acceleration duxi,j xhy:;;az(7v nnje 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/sle+ ,) 6 gzd)v)0w 0wus4wo: pucgecyl on the surface of planet X where the acceleropl lwuevs y)ecw+g:,w)c d0 gu)460 zation 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 su2 av f*vavvk65rface of planet X where the acceleration due t*2 vv5v6av fkao 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 16m*ht9 mq uy4w4 m/s on the surface of planet X where the acceleration due to graviwh ym96t*m4u qty is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usuallyeqzx/7f0buu6l (hq6 ay*/eoy greater than 0.10 s. If your friend holds a ruler/e60a yfu zyu6h7oqb(xlq* e / between your fingers and releases it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity ofgi0z1 cm4xhih ,2 2map 19.6 m/s. What is its velocity after 3.02210 hc ima,zg 4pmhix0 s?

  A bullet shot straight up returns to its starting point in 6 s.u um5lng-(f.a hwi7n( What is the initial speed -n g u.(f7ni( wh5amluof the bullet?

  A ball is thrown straight up with a speed of 36.0 m/sepj9yp0 obm. ek 1zp43op7g 1q. How long does it take to return to its startin1o0pq jy.7k1e4eobp gpmp9z3g point?

  A ball is thrown downward from the top of a buildingjijwiiy u(8t g :+ad9dme)6*h with an initial speed of 17 m/s. It strikes the grouni*d id9+: wi gh)eaju6ytmj(8d after 7.1 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (on .o,qg lrlpdfqpm).**ly fill in numerical value in the blanf*)m.odrl , qg.p q*lpks)
(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 ao+kc7an v+y3the air with a speed of 48.7 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 theeq ug0sf0y e/p1ri+n;9c pkf; velocity at t = 1.0 s?

  In Fig. below, what is the velocity a;8nk; rok/ofo t t = 2.5 s?

  In Fig. below, what is the velocity at t =l 6kbu3kd+ f:3o.ywez 4.0 s?

  In Fig. below, what is the velocitw9 xqbuc09lyqlj. 2 t7y at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.0 s xo6r al zm/mc1gys 2a+55mw,a?

  In Fig. below, what is the average velocity from q ox.aaz y61 jg -tlj8-(*)iwdq9ufrj 0 to 6.0 s?

  In Fig. below, what is the acceleratio-xrl+k0 :2klk3n qk s(i5mb; bte vy0dn at 1.0 s?

  In Fig. below, what is the accelerationqezj+i3in4or wh3kerrk8 (8s1+9j cd at 3.0 s?

  In Fig. below, what is the averag ucyi+r u45;e; -ruygse acceleration from 0 to 5.0 s?

  In Fig. below, what is the average accelerati, 4ut cpx8 m -rxuuke/okz-+*lon from 0 to 8.0 s?

  In Fig. below, what is the displacexmvbw/x(lej53ajp 0vwx ma.. n i c6(4ment from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {x+lsp; )uu-l vspeed|velocity}

  An object can have a2 /loc oj(:akk varying speed if its velocity is constant.

  The velocity of an object can be negativeuct3t .-u ktn( when its acceleration is positive.

  If one object has a greater speed than a second oz 6bmy: 3-n6ufppjcwi5l( tdn1f1jh -bject, the first must have a greater acceleration1 wzfm1nctf-d6uly3j(6-j 5 h:ppib n.

  Two cars emerge side by side from a tunnel. Car A is fpe)g evq,d (fkp ,65j2pqxg*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 decreases.vy05l2i 6qhuyxos5o+qh/ 0y d

  A baseball player hits a foul ball straighttlvnnw3vv 9). up into the air. It leaves the bat with a spewt n ).3vl9vnved 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 sqe) eii cn (2 ;qcf*lyz3c+*z/cz5wiapeeds up, what is happening to its acceleration, how does it chan( a+eii;z) */*cficwzcqc5n3ze2q ylge if air friction is ignored?

  As a freely falling object speeds up, what is happn4ah( h(qdg y :h+w1ioxbf, :bening to its acceleration, how does it chanfb(iwno ghyah,h1 : (d+bxq:4ge if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to ty 0-)j slo.kp32 kk0bk ixxh:x og,g6wg+,yfits original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered,06bk 2jkh30- psgyglk .:gf xto+ wkx,)xyio?

  An object can have zero velocity and nonzero acceleraeeji pc /c65r8tion at the same time.

  An object can have nonzero velocity and zero acceleration a 9 oua;q*:spbh eay+enr/0ab; t the same time.

  An elevator moving from the second floorw:*i/ty / z(ki6tddqod dtv-x y6m,-x to the fifth floor making no stops along the way /w: mt zky6idio6 d*vtdx-x,d(t-yq/ has zero acceleration all the time.

  A rolling ball moves ffzl iow5 .ns/jbhsk: tf8w-: 7rom $x_1=1.9 \mathrm{~cm}$ to $x_2=-6.6 \mathrm{~cm}$ during the time from $t_1=1.2 \mathrm{~s}$ to $t_2=5.6 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.0 \mathrm{~s}$ is at $x_1=3.0 \mathrm{~cm}$ 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 lapsvy qdd x54vna1(2h y(n around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 10.2 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 liny8v r3.i0i/o m)nhx/q49w ngbdkb6u fe, moving 93 m away in 13.8 s. It then turns abruptly and galn0hf o 4kb.uxgri/3)8dw/n9 y q i6mbvlops 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 from 1y9 6rb6u w+-im t4xp8aw7gllgn,yae $12 \; m/s$ to $24 \; m/s$ in 4.2 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 nm4 ;,y+vr8fw :z8eajoqg2 b a dh: kyvf0i4v8$20 \; m/s$ to rest in a distance of 82 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a su)ps*wqw 7d o7peed of $30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.6 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentr3se2k na1 +ysially top speed abous s3+yk21naer t $11.0 \; m/s$ in the first 14.3 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 speed o,l/t8ywuxh i 7f $16 \; m/s$ to rest in 4.65 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 5c5qkl(a8e. im0b(e:ws azsy+ i.m yysl/ ra4 m long on the highway. Assuming a decel.syslilm:a8w.ab+r k cs4yq(5z0 i 5eaye /(m eration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truckg5qosjt )6v;b 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 t m*xxjbf 4eu +g7m/vn-).aagk ct/+l5 wgxqi6he 10,000-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 g xlmx)+a/ iek65cbt q*m7wnvgf4/.ux+g- ja 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?    $s$