Suppose that an object travels from one point in space to anovsgw nb1 o8e6/2n 7iocgo 5.wother. Make a comparison betweeno inn wocg178o 6 /vbo2egws5. the displacement and the distance traveled.

  When is the average velocity of an object equal to the instantaneoud7155o5sllqs 0hh 9ofe3ayvr1n,z he ysnf7 -s velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty:iak)jguy2sqxs qzzdir94bax(.a *)6c .n m; in 8 s". This .i z2uydraq s6b k:z9n.);xaj* sacgmi()q 4xis a description of

  An object moving in the +x axis experiences an acceleration of +yl90h.s2s;q d jgdok$2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x dirn of3)bym z/p3ection) begins to slow down as it approaches a traffic light. Make a statement concpm)3f3 /bnzo yerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begi cagw:ko4 m2ve(9syv0ty5p a- ns to slow down as it approaches a traffic light. Make a statement cetm ya0 45v:k w2(-apc9gsoyvoncerning its acceleration.

  Suppose that an object is moving wi,pctg+bw zu: a 3gc7erco i:rx+c2/.fth a constant velocity. Make a statement conc.:+tc :ccgw faeg rrz73+b,2i oxup /cerning its acceleration.

  If the velocity of an object is zero, does it mean that the acceldqxfw a;vq+ *9eration is zero? Support your answer with ax df9av; q*w+qn example.

  Can an object's velocity change direcqmb ,b5+dlno.*f ;)+:i7g lgfzcrptation when its acceleration is constant? Support your answer with an*lcz+nba mfit5.pbgdr; fq 7glo:,) + example.

  Suppose that an object is moving with constantdre(x5 3(seq,bmfv01 -ginvu acceleration. Make a statement concerning its motion wit1iesnqvd rgf3u m- 5(0(ebv ,xh respect to time.

  Can an object have increasing speed while its acceleration is decrk y 0hk4s7k dxzjy2(d)t3p9k 87 fmqxbeasing? Support your answ79xt x0dk )bmyjkh( 38fy427p kdkzsqer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. Makezsr9)2wcv 1mo15do.x5k* m rju0mqf a a statement 1wv915ma.jo2fqukz*sm0 cx d) rrm o5concerning its acceleration.

  Under what condition is average velocity equal to the average of the yuw2(fyqxo) 8c ni,z *object's initial anf2o qyi xy*)n(,8zuw cd final velocity?

  Objects A and B both start at rest. They bothrn47qgs 0 --hpn+g muf accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed ofg g0mnh+s7nrf- -p 4uq object A compared to that of object B?

  Objects A and B both stuqp:l f z+f)v5g,g a1wart from rest. They both accelerate at the same rate. However, object A accelerates for twice a gu:gqffpvl),5 1+wzthe time 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 in the absence oem+bu (dtl g0y wvj*: bvdc774f friction, which of the following is tr:dwm*+vvtby 4 u 0(de7bjlg7 cue concerning its motion?

  When an object is released from rest and falls in the absence ofyh 8sr3*h,tohbl2;ju friction, which of the following r3u,soyl;t*jh hb 2h8 is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement aboui5xw +tad;is)9uykr6 l 59vvzt the velocity and the acceleration when the ball reaches the hi va9dikuvr5w)t;5l z s9xy6 +ighest point.

  Suppose a ball is thrown straight up. What is itsv 9:bvfo q2lz3k,r b2htibf24 acceleration just before it reaches 2brtb:4hf9zk qi vb lo23f2v,its highest point?

  Suppose a ball is thrown straight up, reaches a maximum height, thee7g:of0 lurogspw t6o n+r;,-n falls to its initial height. Make a state-7wpegfl,ur+o r:os0 n o g6t;ment about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up,f bbx13yglnr:ky , *i4 reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is coming down.rgbk4,1nlfiyx*: yb3

  Suppose a ball is thrown downward in the absence of air resistan)3*4yfl0+ jexkr8u7rwpz2k b m -dzfvce. Make a statement concerning ipwvr3l) j7fzr2u-0+kze84* f bkydxm ts acceleration.

  Suppose a skydiver jib)r*1 uc*,8c0fhg nutg- kfsumps from a high-flying plane. What is her acceleration when she she reaches *u0hs bc,*r-iuf8 1) kggtcnfterminal velocity?

  A ball is thrown vertically upward with a speed v. 7snx/ehd1r: y An identical second ball is th:ydn 71ser/h xrown 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 first ball?)

  Ball A is dropped from the top of d67 (6 / v jqridzkl8s de6af2t0zcz2pa building. One second later, ball B is dropped from the same building. As time c vr8 eidz62pz/qk2zfl 67j0d dt 6as(progresses, the distance between them

  Ball A is dropped from the top of a buildin6hevd* ;n sfr;g. One second later, ball B is dropphv;dnr *;e6sf ed from the same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. Oggg, ;zohz.c.(k zujz o/v28bne is thrown up, and the other is thrown down, both with the same initial spokzb.v oz /2ug,z(8hz.gjg ;ceed. What are their speeds when they hit the street?

  A brick is dropped from b5k 8ij* tkt0pi1. njbthe top of a building. A second brick is thrown straight down frobki n*0j 1ktjbi8 p.5tm 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 +t o)b0);ec.jm*/ 9wzfk nb:th2cdcg sx axis. The position versus time graph of this object i0chme9fb tos kd t.2w)znb:;c *g/c j)s

  An object is moving with constant non-zero acceleration in the +x axis. Tm+/v wy7y/ ylcm v+*abhe positionlycw+ ym b m/+y7v/*va versus time graph of this object is

  An object is moving with constant non-zero velocity in the +x axis. The vel l77rxsa9nez/ ocity versus time graph oe7s 9/nlxz ar7f this object is

  An object is moving with constant non-zero acceleration in the +x c+b 3e4 16pvt 4srzdc+ x, xmttyv*o6qaxis. The velocitxprt4s+b,d6o 436q x cz*e1vyt tmv+ cy versus time graph of this object is

  The slope of a position wf5kwv-nr :;aj 57vi aba9s,bversus time graph gives

  The slope of a velocity versus time gra-5owzx)*ge *idn)2zewgi7ti ph gives

  The area under a curve in 6+zwz4tt/fiu) a u8ddan acceleration versus time graph gives

  The area under a curve in a velocity versus time graph g:.xa ifuf:7cc ives

  If the position versus time graph of an object is a hof2bfu hof1g 0cv)hw *-rizontal line, the object iwfch-0*)o1 gf fuvh 2bs

  If the position versus time graph of an object is a vertical line, the objecp ffpu)m w1o1:t ispp)m:1f ouw f1

  If the velocity versus time graph of an object is a horizontr; 0uhiygu;l9r r i/bk /klz19al line, the object isrigr l0 i/kzu1 b9;/;ukryh9l

  If the velocity versus time graph of an object is a straight line making an ang9yaotg, :d iu/le of 30 deia dto9:g/yu, grees with the time axis, the object is

  An object moves 15.0 m north and then 11. ;+2quve3.i+k hahwo z0 m south. Find both the distance traveled +h3u z2ki.ov+haq; ewand the magnitude of the displacement vector.

  A boat can move at 30 km/h in still+rm z64x,(dodzkbu. u 8xmd1t water. How long will it take to move 12 km upstream in a river flowing 6.0 t186 xbm.4m+rz d ,uzxk ou(ddkm/h?

  55 mi/h is how many m/s? (j , wz.gg 0um,dm,jwykzve*(4 1 mi = 1609 m)

  What must be your average speed in order to travel 350 km in 5.15hyso5xjh 4f76 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. Whiaol6 -7d0+1z7* eyj x)4byqfcjz ap eat is the average spe*p 6cfaij+y4lz7b1ax)-o q yz7e ejd0ed of the runner in m/s?

  A car travels 90 km/h. How l /pdjm1qf;o /o- xolj+go;d8dong does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels injcsvf cqmotm3ncx,+4. .zz0 f 6ig/l/ one year. The speed of light isql m0ci6zn+oj f.m ./3t4g/c szc ,fvx $3.00 \times 10^8 \; m/s$. 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 straightq22gh0o:ij 7no z,e)pw)sf;2znw yf2vcm ms5 road and you look to the side for 4. oq2 hmp2zw);ifs2)72nv zg o:m, ejwysfn05c0 s, how far do you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s,.v rlz a .,aj6n:qiq2o your average velocity:r.2qniqao, vjz l.a6 is

  A polar bear starts at(n,j c2cmc4 v5ohqgo 3 the 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 poing5( ocjmc4c, 2ovqn h3t. 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 sout ,uiqggs nj.7v4r 68xsh, 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 m8i vjunrxgq,.ss476 gin. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mijqz)zya4i9icz so 5rn0 2 q9w*/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 hometowc 9zqz5si4*r2qo aw9y nzj0 i)n from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. kisuexpic so, : rh5k(s6dr ,6 ;7)2yq4dkeug What is the average pskyekqdrdu c s,6hk256oi, r ex;) 7g( i4s:uspeed of the motorist for this trip?

  A motorist travels for 3.0 q)5pewhh:4( wd uiqc( h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for th dw) cep q(iu5wqh(:4he trip?

  An airplane travels at 300 mi/h south fo j)9 *qtpbqbxg6uw. f8cz fr:al f46:wr 2.00 h and then at 250 mi/h north for 68f4faq6pf:tuq zljc* rw x:b.9) gbw750 miles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the pef e6q5tah0 *lkrson 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 lose t0 5et6fkl*ha qhe race?

  A car decelerates uniformly a3qzlur/u w*6xc)l-mm nd comes to a stop after 9 s. The car's average velocity during decelerw3uzx* )l6mr lqc/u-m ation was 39 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 mq op0: 1g5:0f esahyaqusm9v/v,7qj v/s, at the average rate of 5m7 g/ vqauspefvq09 y:sv 10jao:hq,$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at thezibm,.lyn+q ( 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 accelerates at 4xcdx6l4lbl5b j1dd, sr ,b /o$4.0 \; m/s^2$ 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 constant a*acy l91wvf3j.,p m 56pjhchm9vp1n xcceleration of np 9fvl 6mhwv1jmc.pcjyh*x3a159 p ,$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial )33kbhl ;uzs tvelocity of 6.2 m/s experiences a constant acceleration of ult3)bs;z3kh $1.6 \; m/s^2$. What is the cart's displacement during the first 9.5 s of its motion?

  A bullet moving horizontally to the re eu.v h-t9xi:ight (+x direction) with a speed of 246 m/s strikes a sandbag and penetrates a distance of 21.16 cm. What is the average acceler. -e uevxh:ti9ation, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a cafqc8fu 3v54fox 6b:q;sq ba4ytapult on an aircraft carrier. It reaches a spee6x fufy o4 b:8qs;qa 3qcvf5b4d of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant *jcv4 zrq vs1*w:)j.v-mutt nacceleration 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 80bu,g8e pr.+8 kuyvl- vvjlz /8 m/s in a distance of 200 m. What is its average acceleration8v 8-bpjvlz,lueu/8+yk r gv.?

  An object starts from rest and undergoes uniform acceleratioy/):q-. j stpv 0lrgagn. During the first second it travels 2.7 m. How far will it travel during the0a-lgq y) /jr.:stgpv third second?

  An object is moving in a straight line with constant acceleration. eb+wff 7 xmcaf3 t2y1,Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does y,1 3bca+mxe7 f2 wfftit move during this time?

  A car starts from restgr (kr u*wid+5b2i4w k and accelerates 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 drjf/csc c2st2 f,q)7dj1b( rcry road can decelerate 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 t 8 jwzyk4npx, v swe298m:mee1moj81nhat has been waiting at the intersection starts ahead with a con1 ynn241 m,v jeee8w9wmxjpz88o km:sstant 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 of p c )z)jnkzqkn0 h0-up9kzz 1g0lanet X where the acceleration due to gravity isj9q)10z-zc 0k u)nghk zzkp0 n $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upwarc;w37wcillj:u 8/wog : ,pz uzd with a speed of 12 m/s on the surface of planet X where the acceleration due to gravity is 3w lu,:ilo ccw;wj/p8 gz: z7u$1.5 \; m/s^2$. 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 tr y,85i1wbjrqhe surface of planet X where the acceleration due to gr5jb w8r,qryi1 avity 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 o+a v*z1s qphsrg3 9bgn.wbv8l5,nkq /f planet X where the acceleration,q/ wvl h5+q3v9gz s8snrna *.k gbbp1 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 holds a ruls z *aopb/dq3*snpf3+er between your fingers and releases+ p sfad*n3spzo3/bq* it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 mhfizg*7 rao, -vfw;(y/s. What is its velocity after 3.; w7h*ff(r ozyai,vg-00 s?

  A bullet shot straight up returns toyjgat1 u7/ ,h5faivh6+bx t(o its starting point in 15 s. What is the ini/ 17o v6iayu(tx,tagh+j hbf5tial speed of the bullet?

  A ball is thrown straight up with a spe5du2ev l ;wre;ed of 36.0 m/s. How long does it take to return to v r;u;ed 5e2wlits starting point?

  A ball is thrown downward from the top of a building with an e,85 i u-itsyninitial speed of 14 m/s5tuei y-8 ,sni. It strikes the ground after 7.0 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (onpvi w(oeuh/://lb2o 5 tzcgo4ly fill in numerical value in the blp(i/gv2/4/o5tuh ewz c:blooanks)
(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 strarj3)-)o5g ek wvhbdy ryb -,;sight up into the air with a speed of 41.5 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 15 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 15.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity ac7m eo2lt nlw5rcxuftd o ;i-5l.o)n: wv8,+rt t = 1.0 s?

  In Fig. below, what is thinnhtth/brb psmc0 si*3+9 2 5e velocity at t = 2.5 s?

  In Fig. below, what is the veab2 uvz chde8f+;-w i*fu3cvoc gd4er(t)k0;locity at t = 4.0 s?

  In Fig. below, what is the velocity atm/ rwmzg.4:bz t = 5.5 s?

  In Fig. below, what is the average velocity from 0 dn/hvd5u3.b tto 4.0 s?

  In Fig. below, what is the averagequohkz / d surfpd5+.r1h79:v velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration a)-iugoq mn*zi*dox4;-+ (n fbz( xunlt 1.0 s?

  In Fig. below, what is the accelera8,assa 3.kwm41 a hexation at 3.0 s?

  In Fig. below, what is the average alq j16bc ** nmvbkki zk1 o/(.i6th/zxcceleration from 0 to 5.0 s?

  In Fig. below, what *r,v iog)i34s9q sllb is the average acceleration from 0 to 8.0 s?

  In Fig. below, what is the dito.nj)5bzb 9:8qvphs 4 z3ddw splacement from 0 to 8.0 s?

Does a car speedometer measure speed, vo0p q a d4vdii/t(b-m,elocity? {speed|velocity}

  An object can have a varying speed if its velocisnsti/9n,l 0 wty is constant.

  The velocity of an object4je62,vda pg zcg0q0mu9/n q d can be negative when its acceleration is positive.

  If one object has a greater speed than a second object, the fir/x0, r 4cf4yvu,i*as3jz.bf tkj i8 sgst must have a greater acc*i,j u.j3 aicf 8gsvf/4tyb, xrk0s z4eleration.

  Two cars emerge side by side from a tunnel. C6l6bqlvm5 y2xar 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 acc iew-sk) 5bo n3-zf*nzgrz4 c/eleration decreases.

  A baseball player hits a foul ball straight up into the airn h9jng 6g q3ooi/q(l0. It leaves the bat witio6q nohj (q g9g0ln/3h a 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 happening to its acceleratimp(ea.rk( ,zqon, how does it change if air friction is ign,z. rpam k(eq(ored?

  As a freely falling object speeds up, what is happening to iq ,xy gyu*h, q6xc0sf;ts acceleration, how does it csh g yf6 q*c;yqx,xu,0hange if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its originalzg,r rg4c h:icvzx7j 5w,)s 2t position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will, ) igtv4: gh7sc5crrz x2zjw, this result be altered?

  An object can have zero velocity and nonzero acceleration at jagoo xa3o60 dl8c8z f1(1fxhm fl8z8the same time.

  An object can have nonzero velocity and zero0ies wlc00v /o acceleration at the same time.

  An elevator moving from the second floocrodx4z6m ) /0jd;g skr to the fifth floor making no stops along the way has zerdjd06 orscm z/xk);g4o acceleration all the time.

  A rolling ball moves yn s5s 9mdc*1f ,e10+cw)f cfdep4 xvh0amt7dfrom $x_1=2.3 \mathrm{~cm}$ to $x_2=-5.4 \mathrm{~cm}$ during the time from $t_1=0.9 \mathrm{~s}$ to $t_2=5.7 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.9 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=3.8 \mathrm{~s}$ is at $x_2=7.7 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps aroun(n7qdkq9sx tx x+zq 83d a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.6 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 gmq)qj4*axwxq+ . / lm3j9mbxstraight line, moving 87 m away in 10.7 s. It then tur+qx9m4q x )mjqgjx* /.3lbwma ns abruptly and gallops halfway back in 4.8 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 49zl kvhqw++8y. dqf i$12 \; m/s$ to $25 \; m/s$ in 5.4 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 frovq/t8dc j8y lrx9 t5r /4xcm0im $18 \; m/s$ to rest in a distance of 78 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach y ,pn 9e*;*xdnxdxq n-a speed of $30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.9 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top speed afm3g /pxxm3 v;oz. i-tbout- xomgmiv3; 3z/fxt .p $10.1 \; m/s$ in the first 14.7 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 0t w(/ f- /k.qtbjrme;nliv 9ffrom a speed of $17 \; m/s$ to rest in 5.58 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 highwaysyvl, wm4 6af,. Assuming a deceleration of 6ya, lwvfs,4m $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goiygm. pl1qboe6 63nqic1 c9,kxng $25 \; m/s$ 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.-xzcrju: )vi5 After exactly 27.0 min, there are still 1100 j- 5 zv)urc:ixm to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$