Suppose that an object travels from one point in space to another. 2 f8eyym+gz *ywkht4 5yu9tjzg8 f1o0 Make a comparison between the displacement and the distanc8ettm gfoz2y*9 05ug+ 1wyh j8ky4yzf e traveled.

  When is the average velocity of an object equal to ta75k :asfz0 hohe instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero tmle (2f+s8y.-kn tqxto sixty in 8 s". Th 28-m+ktftqxeyl( ns. is is a description of

  An object moving in the +x axis experien.d4-l;f i4mt hudgr j(ces an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car tlu 7 2cbx76wmqbhnf *n4caw21 raveling to the East (+x direction) begins to slow down as it approaches a traffic light. Make a stuwbmhcfa cb21wx727qn l6*n 4 atement concerning its acceleration.

  Suppose that a car traveling to the+fh,pm4de cp0kt -lvkm;2nu 3 West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning 3pm-pl42kmn0etkd v+fh;, ucits acceleration.

  Suppose that an object is moving with a constant velocity. Make1*2*vqpiucy9mbol jq)fca195o d d + v w.gun; a statement concerning opamo9uqq)u nw*gb yc 2v5 d1 j.fil+;dc 9v*1its acceleration.

  If the velocity of an oupt +9: ecvr,j 1oqw+ybject is zero, does it mean that the acceleration is zero? Support your answer 9jveout pw qy,r+ 1c+:with an example.

  Can an object's velocidw- b4odqxufqsp8/ .*ty change direction when its acceleration is constant? Su.4 p-su xd*dqw/q fbo8pport your answer with an example.

  Suppose that an object is moving with constant acceleration. Make 0oxz ;it pglw c-z33z19con /ba statement concerning ltzzn3z9 p0 cogcwo;x 1b-3i/ its motion with respect to time.

  Can an object have increasing speed while its accele /*lb7qxfm7i3qe*fvaiv n41m ration is decreasing? Support your answerqaf*e*m/b mi4qvl7fv31x7 n i with an example.

  Suppose a can, after an initial ki8rfyie d1m5h75k lok 1 z)9gm(jaxk *nck, moves up along a smooth hill of ice. Make a statement concerning its accelo1)9f5g k*z815dynxailkrkem (j m h7eration.

  Under what condition is average velocity equal to the average of thexd.bjy n nt.t x(l42s c:-/iem9quw,u object's initial and final velociyl t-:4ujqi( x.9utxsc/en b.m dwn2,ty?

  Objects A and B both start at rest. They both accelerate at the sxjlrhxd q+a90 59d0 sr6r,bedame rate. However, object A accelerates for twice the time as object h09r da,xr+d5jrd 9 xl06sbeq B. What is the final speed of object A compared to that of object B?

  Objects A and B both stalm s +p dbj84;v:z1vjirt from rest. They both accelerate at the same rate. However, object A accelerates for twice jp:4vv ilj+18 s;zmdb the 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:+lnas5v b-te a4x 3px3imd/ o falls in the absence of friction, which of the foln : +-bm5xa4ox33e/ldisv at plowing is true concerning its motion?

  When an object is released from rest and falls in the absence of friction, whisr/8xkjii+(e6 s, p qdch of the following r6,k(+ ji/id ssx8pqe is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about thzrm6e, ;p,5 uks mr1hpe velocity and the acceleration when the ball reaches the5, spuh ,rrm;1zp6k em highest point.

  Suppose a ball is thrown straight up. What q:rf*l )2iyvu6 3framrgm 8g1is its acceleration just before it reaches its highvf mar )2g 6ur3*:y1mrfg8iql est point?

  Suppose a ball is thrown straight up, reacheskif8n pz;.g/b a maximum height, then falls to its initial height.n i/8zf;bgk p. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maxn n1 vq06;dxd rba2*fbimum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleratiobqvx1 r 2nf0 *ddban;6n as the ball is coming down.

  Suppose a ball is thrown downward in the abseneriezv,o:.)fx(w4eem4 )q.u e/x ky rce of air resistance. Make a statement concerning its accelera ,eev)f4ro4xr y (ee/xuiz :q..we)kmtion.

  Suppose a skydiver jumps from a high-flying plane. What is her acceleration wh6x.jicqk)qqtkp 07 (vxwfjkwn1: 22qn*l qu/en she she reaches tev 7xpwx2 * u/tkqji qf6:klq2 w.(jcn)qkq1n 0rminal velocity?

  A ball is thrown vertically upward ws)nhl3t 4zkb( ith a speed 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 of the first ball? (How many times higher does the second ball go than the firs4) nbsk 3lt(zht ball?)

  Ball A is dropped from the tqxp2h(n b p5tog: ha/dywh8fxbi09 , 9op of a building. One second later, ball B is droppe,hgf8yp2b n5xotwi9( dq xa9:0p/bh hd from the same building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, ball B .+k oo oc0e)es52c.cy jd:s:;kd abulis dropped from the same building. As time progresses0sscu)+.okcod5y eal2d cob :je;:k. , the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thri+v- ls0 giuo5own up, and the other is thrown down, both with the same inits iul+50i-vog ial speed. What are their speeds when they hit the street?

  A brick is dropped from thezh* m57mg r11 mkvc x(n:3anqn top of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the a(zk173mv xqrnnma c *g mh:n51ccelerations of the two bricks.

  An object is moving with constant nobwp)f - y/zp)tn-zero velocity in the +x axis. The positionwp)-y pbfz)t/ versus time graph of this object is

  An object is moving with constant non-zero acceleration in the ho7 p j)ogc)g2+x axis. The position versus time graph of this objehog g))c27 ojpct is

  An object is moving with constant non-zsz6lm l y;8l*r rt(l96pudy0 kero velocity in the +x axis. The velocity versus time graph of this ob9ltz6lr*y;6s d l0lk8 y(mpru ject is

  An object is moving with constant non-zerzjc13o,r 01h1osm fo ho acceleration in the +x axis. The velocity versus time graph of thzjcm1 h3 o1oh01r sf,ois object is

  The slope of a position v8i 9*uk; xovohersus time graph gives

  The slope of a velocity versus t)4 yonwmqul5j*d02s time graph gives

  The area under a curve in an acceleration versusv0f n7vg v5v, ct/s1v9zn9py5yjr *zu time graph gives

  The area under a curve in a velocity versus time gr 8 y5ndnmd)/q ilku*v,aph gives

  If the position versus time gaoy hp);:w3st52sp-x(dj sjdraph of an object is a horizontal line, the object -a j(s wo52sdxpysj)hd:t p3;is

  If the position versus time grap l4q ieg o 4kueimr2.x+dn.5e)h of an object is a vertical line, the object isklrnmi44eei25x o) u ed.q.+ g

  If the velocity versuse):b.1a3w)hrbp pit6qxtb s2 time graph of an object is a horizontal line, the object bs.w p 6e)tt) pha2 1rq:bb3xiis

  If the velocity versus time k)(xy 5o/cz e9osla-tgraph of an object is a straight line making an angle of 30 degrees with the time axis, the oozsxlyo(5a/ke-9 t) cbject is

  An object moves 15.0 m north and thene.z kri*huv z52 nto33 11.0 m south. Find both the distance traveled andi3 3*et2znvk .huzor5 the magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How longdq:o skq * 4mj/z*w,nx will it take to move 12 km upso /k swq*mx*, zj4:qdntream in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = d*1 br)c3i)rbebl0 h i1609 m)

  What must be your average speed in order to travel 350 km in 5.1s(exyy ,1y:wtaa,q l:5 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours; q4+.vfw ftq1sde c6h and 57 min. What ish4f q1 tqved ;+s6cw.f the average speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travx/6bx8a2is wvel 400 km?

  A ly (light year) is the distance that light travels in one year. The speed yip+0x0or3 whnp-vb2yqir-9 of light is --03w+x 2v nqoir0i 9pphybyr $3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

  If you are driving 72 km/h along a straight road and you f pjb tv,*c-p 9gc)-ng3:ivhjlook to the side for 4.0tp -,p-ihjc9v v *:fg3bnjc )g s, how far do you travel during this inattentive period?

  If you run a complete loop around an3 pww95dt ik,u outdoor track (400 m), in 100 s, your average velocitwd u5iwp k3,9ty is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 51x2f-tav afw km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip 1 f5aftxv-w2a takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pox26idbp6 4 a n8jvxd1yle. It travels 1.0 km south, then 1.0 km east, 8a j1dx6pxdv6y4ib 2n 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 velocity?

  You are driving home on a weekend from saoz ko09gjz:2chool at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driv goa0kj92 zo:zing 4 hours and 15 minutes. 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 tcu )sm)t 6qy;y7uv)r dhe average speed of the motorist for this trip;m 6ys)uy)rv7t u)dqc?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at .k4 vaq:) :l(7kehm yk9 ybkdd100 km/h. What is her average speed for the tri7ev. )akbdlh 4kd k9y(::m ykqp?

  An airplane travels at 300 mi/h south for 2.00 h and then ai21pp2)j6z6r r irpd/ qby ld wzp..i3t 250 mi/h north for 750 miles. What is the aveili63 . )prrdjppzdzwp1.i/2r2 b 6qyrage speed for the trip?

  In a 400-m relay race the anchorman (the person who rgg ltk8ub ek25 66yvr i)xlx1:uns 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 fin k6vl)ye6:ukg1l8x 52igtr xbal leg of the race, in order that the team A runner not lose the race?

  A car decelerates uniformlyx5dilr: 4 qri3 and comes to a stop after 12 s. The car's average velocity during deceleration was 35 km/h. What was the car's deceleratii4xl r5dq 3ri:on while slowing down?

  An airplane increases its speed from 100 m/ if48d-e 7j+vz*ggw b6tsq:lrs to 160 m/s, at the average rate of g8 wr 4gf:lsb-ez7td*6ivqj+$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h aco0j 9tvz x;7/ po(uf:m.nyspecelerates at the 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 ateepb6c0nva 6s5+i jq h7qig wpcw2) 32 $4.0 \; m/s^2$ 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 w*5x,lhaxu 4d z3v,xn-t1dnx cceleration tzna ,1xw45,* ndlx d-v3hxxu 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 1.8 m/s experut /l+cg3lgn)gy pt9itv m: ))wg+o6uiences a constant acceleration of gmp)+t/ow9 gty 3l+) ulcn)6 giuvt:g$1.9 \; m/s^2$. What is the cart's displacement during the first 5.8 s of its motion?

  A bullet moving horizontally to the right (qyjpi ( ,*lkr- fw+xj)+x direction) with a speed of 435 m/s strikes a sandbag and penetrates a distance of 96.54 cm. What is the av-k, jf* r+lw)iyq(x pjerage acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrier.oh3fdg;)a,hhpw e9 t ,vu :u8m8i1a nl It reaches a speed of 42 m/s at the end of the cataph8nh,w g;f 9oputm : 8l3ev1,hduia)ault, 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 accelerat l1hgz.f qpg8 r(uws sp-wmr1-q.iz8+ ion 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 jq8a3kpylz +xt*1a*t7 a k8 nii(o,dvof 200 m. What is its average accelerai* aaoxvkqin1 p(l37t+z8yk8t ,ad j*tion?

  An object starts from rest and undergoes uniform acceleration. During the fim /u oh0te2*b dk5yn a*m*ge;arst second it travels 9.9 m. How far will it travel during t ;uam b5 tnag/e*2keyhd0** mohe third second?

  An object is moving in a straitlk ;-r3 t +ly-6fu zqo.ttz1oght line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it z.o1zo6r ukt tly;- f+l q3t-tis traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniformly at .clsoo 45z x d,cpi/1 xznrx2($3.0 \; m/s^2$. 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 at aa/h8zo 4futw; bout $5.0 \; m/s^2$ 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 thz6d3 tgdn pa)g2+fy6hat has been waiting at the intersection starts ahead n 3g6z ay+hp6dtfgd 2)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 u qj-ouiw;dz )t/f; 4 znp6u/uiz r*2vwith a speed of 12 m/s on the surface of planet X where the acceleration duetu4juz -/i2pn;u; rz/ iu wd*oz vqf6) to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upwar ey*(z1knv/ u ,uzf1o3m jgkk,d with a speed of 12 m/s on the surface of planet X where the acceleration due to gravityfo y(v k1,3g/uju n km*1zze,k 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 oy*o4 k(5 g5hf0lkg9 at cqozs/n the surface of planet X where the accelf*sz9lt5 0o5k/(ok 4yg h qgcaeration 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 dur7j9dj 3mz*speed of 14 m/s on the surface of planet X where the acceleration due to gra j7dzj9rd3 *umvity 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 ho,ozdc23 ep o zb2fp w)s-m 2bqs/w8z-olds a ruler between your fingers and releaseo-bz3 2eo8 p-sp2 2/fos,b)cqwwmz dzs 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 m/s. What is its velvk qvh q8j t5ws9b+(/iocity after 3.00(jqwt5 vq9bsh8 v/+ik s?

  A bullet shot straight upb s9i*vc6; ari returns to its starting point in 7 s. What is the initial speed of the 6;9iri csb*a vbullet?

  A ball is thrown straight up with a spee:tan 48. za:wd (q;hi:po)eplxx y p:fd of 36.0 m/s. How long does it take to return to its hpp8dnex :.zpo: ;wt qi:fxaly)a(:4starting point?

  A ball is thrown downward from the top of a building with an(jmprv: wd/)ta7* xd u46laaj initial speed of 16 m/s. It strikes the ground aftea p *)rx(6v u74/wdamld:jtja r 7.1 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s8ef9gs5 w noval+ mwf: 4w(vu*. (only fill in numerical value in thu nww9of ea8*fmv5g4(+ls w:ve 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 )cr kp lp3,fek4tx/l; speed of 48.9 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 1 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 = 1.n 6w j(asol.yik2ob .qfoepq;8b7 *up:bxb 51 0 s?

  In Fig. below, what y1 w:jrm; y ;(lz.qlefis the velocity at t = 2.5 s?

  In Fig. below, what is thev9l rwq0q (oxmrw26 (z0ncfad.3wc. o velocity at t = 4.0 s?

  In Fig. below, what is the velocity at t = 5.5 s?mh e zf+jwnmt +*fz2h9;v7ne;

  In Fig. below, what is the average velocity fr69xg 9cmdlvxg-*b ni+om 0 to 4.0 s?

  In Fig. below, what is the avyola0421nj pl erage velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 e+ij--pigw izf- wlk23 )s2g( ,wdvdw s?

  In Fig. below, what is the acceleuyjbn1mi kty0 /;04-dvr0nf u zn6+jnration at 3.0 s?

  In Fig. below, what is the average acceleration from 0saehplo 76 3*k frwqknlq3u2aqz(8h t,z.-b3 to 5.0 s?

  In Fig. below, what is o0meya95y4 b xthe average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from x3ef nd4r3:+yb ygw0c0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|velocitv) mc ivdjbx9o)a ;pb7)qte )m bg/9+ky}

  An object can have a varying speed if its velozkk ))ruew4 -wcity is constant.

  The velocity of an object can be negative when its acceleration is positiveoch.v9 aw+g+ w75gpfs.

  If one object has a greater spep gxvpr-6 kr/9tjr78la h:5d+3 z zkkped than a second object, the first must have a greater accelerationl5apjvkx68t p9z rkh/ -zrrd3:pk+ 7g .

  Two cars emerge side by side from a tunnel. Car A is jcpv8di .fn x.fn7hgs ema8f + /j*8+ctraveling 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 incj7:a1*jdey 4r i;b njpv,oka:en ,y 6dreasing in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the4drfr+je da(2 air. It leaves the bat with f(j2 eadrdr +4a 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 objeb1qhj9rz gs n;uwv y 6j.b-v r9+b+0mkct speeds up, what is happening to its acceleration, how does it change if air friction is ihv60y-+m9ju. b1 vbr9 rn+;qwbk szjg gnored?

  As a freely falling object speeds up, what is happen6e;:.8wevyvhjs e 0iqing to its acceleration, how does it chs w6.:yvq j ehe0;vei8ange if air friction CAN NOT be ignored?

  An object that is thrown verticallyk. (ao*a y84n+/m gkhusxx2fjk c+yn6 upward will return to its original position with the same speed as it had initially if air resistance is negligib *ks6(4ckny8g+ joxy/ahxknum2 a f.+le. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero 0/05wnoomt9nnx3l (b j8zvny acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the same t g 7g0/bckxt8uo*z9vbc 1xm 1time.

  An elevator moving from the second floor to the fifth *yh cs8w)in /ofloor making no stops along the way has zero ac *w8ho n/yc)isceleration all the time.

  A rolling ball moves from:v(ul g *hsv2j $x_1=1.8 \mathrm{~cm}$ to $x_2=-6.8 \mathrm{~cm}$ during the time from $t_1=2.7 \mathrm{~s}$ 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 $t_1=-2.0 \mathrm{~s}$ is at $x_1=2.6 \mathrm{~cm}$ and at $t_2=3.8 \mathrm{~s}$ is at $x_2=7.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps aroun+nh/) h9 rvnci36ho zid a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 9.2 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its traintft 9o:ep,qxz)whj)3x +c 9wker in a straight line, moving 101 m away in 12.6 s. It then turns abz,c )t39 o:jqhw kxxw9pt)e+ fruptly and gallops halfway back 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 fromd; (vt o;rv:nr dnq59m $12 \; m/s$ to $23 \; m/s$ in 5.6 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 fromzjuc+zvfv;25r( y rtio4s:6 q $21 \; m/s$ to rest in a distance of 60 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reacubns2ssc-)u dmlg,b4 k9c- u2h a speed of $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.1 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out o71 p0,i )eb bgzz8ecgyc, tc5xf the blocks to essentially top speed about egcy eb0 1 z,,)7xgzt8ip bcc5$10.9 \; m/s$ 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 of +/x4sn2mesyrl q)s6a( f cqy4$17 \; m/s$ to rest in 5.12 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid m2kh 9(lp( 7w+tirgigwahgj)89h qdy +arks 92 m long on the highway. Assuming a +ga7qwyg9 dwtk p 8h 2ii(h9glj+)r h(deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truc13imhb ;07wq*nc vnex(j mc0jk 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 than 30.0 min. Afters6 2a;d4ppjr g exactly 27.0 min, there are still 1100 m to go. Thd rpj2gp;64 ase runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$