Suppose that an object travels from one point in space to another. Maeku4; 8 xh(aivke a comparison between the displacemenk (iva4e; hx8ut and the distance traveled.

  When is the average velocity of an objecpvs 4d-isdd,9 8nyuv 8t equal to the instantaneous velocity?

  A new car manufacturer ad/9 tx b11yql .epdfrju33oj 3qh2qm n1vertises that their car can go "from zero to sixty in 8 s". This isofdq 3leb.1urq/x1t 2 3qj91pymhnj3 a description of

  An object moving in the +x axis experiences b/2pripm+kam 1n8s2o 0f rq+t an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x directx9flm)0 0th cy6vl .grion) begins to slow down as it approaches a traffic light. Make a statemelg. 09ml tyf0vrh)x c6nt concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow do8z ,aao;h 4) np6wtrnrwn as it approaches a trao ,nwt)8n;a6rpahz4r ffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. i8uyugb/-izvl bx0r re 6,(x(Make a statement concerning ir8xb zi r0/(ig vu,(yebu6x-lts acceleration.

  If the velocity of an object is zero, does it meantv9* ;)qiy p hihcf1o* that the acceleration is zero? chh)vqtp*o1i;y9 *fi Support your answer with an example.

  Can an object's velocit3erfk -k7 w1.ikf s znt)/xz)qy change direction when its acceleration is constant? Support your answer with an-k .tkefwz r3sk/ fnzqi 1)7x) example.

  Suppose that an object is moving with cons+ ajjfs9se(ovb .(1cjea n 21xyat3i 2tant acceleration. Make a statement concerning its motion with respec.9fab(ean 1st+jjyx 3j(2 oeai1v c s2t to time.

  Can an object have increasing speed while its accexr0ht1 l,9 krd9bm ryiyiv *7i:k,5k hleration is decreasing? Support your answer *i mktivyy 9,r7rk, dhhikrx9:0 15blwith an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. Makevu/.gia xm,zz0 b:6 ;*r arjse a statement cons;i /u. ara m*grz:z ejvx0,6bcerning its acceleration.

  Under what condition iszuhmr c;-;nvvhkxe +g; 0/f7f average velocity equal to the average of the object's initial and final velkh7-/v ffe0 c mn;;+zvr;ghuxocity?

  Objects A and B both start at rest. They both accea wc51 j+b2vqulerate at the same rate. However, object A accelerates for twice the time as object B. What is the final 5va jbq1c w2u+speed of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the same ratds(zm7z)ba d a.- 5k nme9w26sye)u rzhu8 (pwe. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of object Bkdeez95dz7b6pn w). ah-wr( u8am2( s)syum z?

  When an object is released from rest and falls in tyccjecqo r kbd8bevx.v,). 3 s5zf*) 0he absence of friction, which of the fkb)qreoe 0z3c dx b*v.5sv .ccf,8jy)ollowing is true concerning its motion?

  When an object is released from rest and falls in t i hszlo1g;3 /26gm/hbfc/lzp he absence of friction, which of the follogh2 ;l6bo3pls h /m gfc/iz/z1wing is true concerning its motion?

  Suppose a ball is thrsb;p9x,h caf /own straight up. Make a statement about the velocity and t;hpxbsa9fc/ ,he acceleration when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceaqv()ui j x9tu+piu9 .(7ajbsleration just before it reaches its highest poiui9(.)vbjp9u s u7jx+t(q aiant?

  Suppose a ball is thrown straight up, reaches a maximum height, then fcfw1ekr+3in lzc9:p 0 alls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is going up.l0rp+w nz: 3e9cc1ki f

  A ball is thrown straight up, reaches a maximum height, then falls gdi3,fk--z,rh4bx7ofnze ; o to its initial height. Make a statement about the direction of the velocity and acceleration as tr3e f,7g;-o x,k hf o-nbzzd4ihe ball is coming down.

  Suppose a ball is thrown downward in the absence of ai3mxhx*0emv n zt)w) )t++b fvir resistance. Make a statement concerning its acwttn) 0)zv*f +)hbm+e3i v mxxceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her acceleration)fhxax u.*+4nqouad 1 when she she reaches terminal1)a u+f*nd4 .oaxuhq x velocity?

  A ball is thrown vertically upward with a speed v. An identical second bay5fcy;ui gz/k lbg:a6;5fa a4ll is thrown upward cz 5bg/4 ;afk5fi;ygl:y6 uaa 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 a building. One sein-wv8ykz ez k.hd)::cond later, ball B is dropped from the same building. As timwd8k h) :e: ky.zzi-vne progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, bt05.bc/)vt5b npu8s;pih y axall B is dropped from the same bupas ; xi5y0n 5ct/.uh8tvbpb )ilding. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thro 8 ajy6yutn*+1nk4 fsnwn up, and the other is thrown down, bott*k6unf8y1+ j y4 asnnh with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building.joqg8- wh+/ti A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the/wq8gh jit+-o two bricks.

  An object is moving with constaa smi*or1,/mmnt non-zero velocity in the +x axis. The position versus time graph of this /mmaso1,i m*r object is

  An object is moving with consflg4hx,q k :2chf9, u/u3os rquk39d btant non-zero acceleration in the +x axis. The position ver3k g u9uluqf, ,ho4/d2 csr9:h3xbkfqsus time graph of this object is

  An object is moving with constant non-zio k ;rgtfu,44d*nww6 (heb8 bero velocity in the +x axis. The velocity v n;u4 r,ew 4kwb(db6tho*g if8ersus time graph of this object is

  An object is moving o w;xok3z ;yb6with constant non-zero acceleration in the +x axis. The velocity verb6; 3oxyz;wkosus time graph of this object is

  The slope of a position f. q5 km5f-rm/tsnm/a versus time graph gives

  The slope of a velocity versus tsskxl ;)6h if/ byn/:vime graph gives

  The area under a curve in an accelerb0mf/j-16n qx pm+ ekhation versus time graph gives

  The area under a curve in a vesuj)dc,q w4+p+ gen 1xlocity versus time graph gives

  If the position versus time graph of an obj0czl-ib ;lbtwgduffn2 /4; +lect is a horizontal line, the object zlt+b f fignb d;/;4lc wu0-l2is

  If the position versus time graph 6 lx+c8y:b5wv mo5 lbnof an object is a vertical line, the object isv+:5l lxnb8bm w6y5oc

  If the velocity versus time graph of an object ieuv) dju5-i l:s a horizontal line, the object d)u :v5j leiu-is

  If the velocity versus time graph of ae1p:x /gebo +kn object is a straight line making an angle of 30 ge+p/o:xkb e 1degrees with the time axis, the object is

  An object moves 15.0 m north am(9/ql g e.1.jdo::lpu cgr lb3oosj -nd then 11.0 m south. Find both the distance traveled and the magnitude of o b:..3g 9/gdorelocmjj1(s :lq l-p uthe displacement vector.

  A boat can move at 30diio8 -k.uvy9cfk-j )g r-7 yc km/h in still water. How long will it take to move 12 km upstream in a river flowing 6.0 km9)-y j-vk . ogkirf c-u7dy8ic/h?

  55 mi/h is how many m/s? (1 mi = rugp blvvx:dgetjk62-) hk; ai,20,u 1609 m)

  What must be your averacsaudpdg 2 o1/e7 9 )tcpl9g,sge speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 6ds 6f(r gdcf+s,3s ug42.0 km) in 2 hours and 57 min. What is the aver6g+ss (c6ud3 rds g,ffage speed of the runner in m/s?

  A car travels 90 km/h. How long does it tandu5jtz.qqy2.6 j:ytu 6es6oke for it to travel 400 km?

  A ly (light year) is the distance 50 utyw *k5fl c x5s:vw*x0ezithat light travels in one year. The speed of light izi5*wykxsvuwc:5x e0 t50 fl *s $3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

  If you are driving 72 km/h kp +f1hou-5q( rmnd;qt,v-o2d bb2z q along a straight road and you look to the side for 4.0 s, how far do you travel during this inattentive pephm-u drzb21-q; qn5fv2qb d, oo+ t(kriod?

  If you run a complete loop around an outdoor track (400 m), ixq ;9jj1txk:9 fyt)o on 100 s, your average velocitj t t;x:fo)o91xyjq9ky is

  A polar bear starts at the North Pole. It travels 1.0 km south, then qobf m y j4sy*yf6y48,1.0 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 spybfm4sy 86jo,y 4yfq* eed?

  A polar bear starts at the North Pole. It travels 1.0 km south,phb:dsb ozy/ aiptz(vx-u 07z: *tw1/ then 1.0 km east, b yp/ *7:oxi pt/zzbh w0( tdavz-1:suthen 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 school at 55 mi/h for 110 miles. It .6rzh7c- zr41 pn goodv.fm3fax8e .jthen starts to snow and you slow to 35 mi/h.e7 pan-zv4x.r.6 mcjh3fr zg81.food You arrive home after driving 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. tl; 06fwjnc9c,qpq a) What is the average speed of the motorist ), wt;c jn6fqp qla09cfor this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What ip0m u-jn( -ai(* 1x2)xhvrnu k fa8hzvs her average speed u z-hkf xx( 8 0r 1v-(na*uapnj2)mhivfor the trip?

  An airplane travels at 3zi n*rcu3w; ugd.0l h;00 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for the tw.ln;* uc0id 3ughzr ;rip?

  In a 400-m relay race the anchorman (the pe (m+hhv.7h 0ay1 olnjvrson 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 v7nh(+mvo.h 1h0ayljm 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 uniformlwov ng+ yj-urv 5 x-s::w-1.emvpj8 bjw9 c:tvy and comes to a stop after 9 s. The car's average velocity during deceleration was 50 km/h. Wha oj:xwvnw 5gvm:tvp j:bjr9+v-u- sw-c.8y1e t was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at thxhcdwqxi +c,h q:jtw9e cw/) izn0))/e average rate of +tndc)/jqzx)x ,ch)iq0w9hc:w ew /i$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerat0qhr-zvnbrjrzm:0e3zr . jyik . )5 (;7q jrqoes 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 at ifj78a9 p9a(y- m.gw4jbk5ds ogm/d ,l ovi8g$4.0 \; m/s^2$ 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 ;vb h 7aplwv2k 5d/i3pspeeds up with a constant acceleratiopa 3pwkv;7bd5hi2 l/vn 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 6.2 m/s experiences a constant acm-uw40c 0wqqwd/7l /9fik idtw6,png celeration ow0f7 qqidm0kw6u w i /4wt,dc 9pg-/nlf $2.9 \; m/s^2$. What is the cart's displacement during the first 9.3 s of its motion?

  A bullet moving horizontally to bf7+nw)- addn x(xugr/ r) kco3p)2r nthe right (+x direction) with a speed of 300 m/s strikes a sandbag and penetrates a distance of 62.90 cm. W)rxcu/d )nr7 awfnp+rn2b 3x)o- d(kghat is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrier. It reag/m/. jpdk1ow ches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is 1.m pjgdowk//constant, what is the length of the catapult?

  A car starting from rest moves with constant acceleration of a *znj-hen6e7$2.0 \; m/s^2$ 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 0 q dk8q5*llptits average acceleratiodll5 pq q*80ktn?

  An object starts from rest and undergoes uniform accelebho(c9 xt ln 1ggx,0dk8y33f aration. During the first second it travels 3.8 m. How far will it travel dd hat3ol3ngg0kyx1b8( xf,c 9uring the third second?

  An object is moving in a straight l h:-elymw:7 cn 8n-ggsine with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at gnsgcyhenw : 8l:7m-- 10 m/s. How far does it move during this time?

  A car starts from rest and accelerexiq ; sc:u+3hlgv601jkl7znm-w, i xates 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 at a/65u qzdt(yh2d fj. nnbout $5.0 \; m/s^2$ when braking. Suppose a car is initially traveling at 55 mi/h.
(a.) How much time does it take the car to stop?    $s$ (only input numerical values)
(b.) What is the stopping distance?    $m$ ((only input numerical values)

  At the instant a traffic light turns green, a car that has been waiting,1z;rpr n6(o vsrjj bgv)zc56 at the intersection starts ahead with j)vsrpn gb56 jr1 ;vcor(z6z,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 sy3cg8o+ .x wjburface of planet X where the accebo w3yj8 .xc+gleration due 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/s on the surface of planet X w8)crnrzw:.6ak+ i ls ghere the acceleration due to gra8c wnar kr)l:ig +sz6.vity 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 ob44-,t zpe-ftky tts2b2u :rp2 q 0fvsn the surface of planet X where the acceleration due to gravity i vp0s pe-:2,fb44 tst-kft2b2zru q tys $2.5 \; m/s^2$. 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 surfacet f4b+yvhyqyhs. c755 of planet X where the acceleraqyy7 t4vbs5.h+h 5cf ytion due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time isu 97pr3 nwy0cp usually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, 7prcy n0pwu93how 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 8a1 5n;mpidh;7qvh;tg kxx2 n6w;y yuits velocity after 3.00 s?18xpnq;n; y; tiuhha 6gx 7k2ywmd;5v

  A bullet shot straight up :p x/paoo(5xureturns to its starting point in 7 s. What is the initial speed of(/ 5poxap u:ox the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How,+3r33 vlsmp4 7mi us; xzqzhp long does it take to return to its startingizu;34zv+hxr,l pp 3mq s37sm point?

  A ball is thrown downwardq/eofzzmg1u1n- ( f,1izx3 xu from the top of a building with an initial speed of 9 m/s. It strikes the ground after 4.8 s. -f oq , 1umf/x1uxzei1(z3zgnHow high is the building?

  A ball is thrown straight up wit a-)adzv yazbhj:jlg;e+p01.rxft 8 8-w j 3hrh a speed of 30 m/s. (only fill in numerical value iy0 8 pa-wj3fabax;-zr ljhdzg ).v+rejh:1t8n the blanks)
(a.) How long does it take the ball to reach the maximum height?    $s$
(b.) What is the maximum height reached by the ball?    $m$
(c.) What is its speed after 4.2 s?    $m/s$

  A foul ball is hit straight up into the air with a speed of.4v-;vc dkby3ysfnt ux :of -/7 tno)j 41.0 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 3 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 13 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 13.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what ,y+be / )odnp4yvi1rgn7 0fssis the velocity at t = 1.0 s?

  In Fig. below, what is the vex:: wu(u0+uhes5tab u locity at t = 2.5 s?

  In Fig. below, what is the velocity at t a+ krzx/ s -)lqgt7-de= 4.0 s?

  In Fig. below, what is the velocity at t = 5.5 a-anc4xi4n,3g(mago 1er b* js?

  In Fig. below, what is the average velocity from 0 to 4rrc;es426 9gwhtm kx49w joba5:v7kf .0 s?

  In Fig. below, what is the average veloc i)a s2v ygr*p4hk)nk6ity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at0 3ezheo *weu/ra4rs6 1.0 s?

  In Fig. below, what is t+m6)szx sgu m+he acceleration at 3.0 s?

  In Fig. below, what is k,)rfw6j0 l 6bfhdn12s.vzvxthe average acceleration from 0 to 5.0 s?

  In Fig. below, what ig2pa p52)ni) k0x/nto,buts k4k *;poo ek)nfs the average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 tow5+ whxfd , j8moc;me16h qg/q 8.0 s?

Does a car speedometer meashmi5y nb 8zp,j7z.:iith6wz; ure speed, velocity? {speed|velocity}

  An object can have a varying speed if its velocity is constant. kt9uj(5: ni7w hk-amu

  The velocity of an object can be negative when itnn50x/lc ;8wgze ;tr+*4 wv/v bc erges acceleration is positive.

  If one object has a greater speed than a second object, the first must habb k 6j)b)x(tfws k9xc5z:fmtr..z5ave a greater acceleration)5)bm5jk(fzt xc9b.r.za k :bfw 6stx .

  Two cars emerge side by side from a tunns3y0fx/;tapl:rq ofs :ng3 ,j55tutqel. Car A is traveling with a speed of $60 \; km/h$ and has an acceleration of $40 \; km/h/min$ Car B has a speed of $40 \; km/h$ and has an acceleration of $60 \; km/h/min$ . Can A will pass car B at the instant they come out of the tunnel.

  An object can be increasing in speed as its acceleration ur 3tkdf*, (ladecreases.

  A baseball player hits a foul ball straight up into the airwvy 96o h3vhr+z,1u pr. It leaves the bat with a rp1yuh r3+z v6wvh,9o 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 acceleration, hd:e ikltz/h 6;ow does it change if air friction is ignzh e6k t/;ldi:ored?

  As a freely falling object speeds up, what is happening to its acc aqg y ;wz)ulno1y;zcn(2ml83eleration, how does it change if air frict ;(;ycom3w2 yl1ulanng 8qz) zion CAN NOT be ignored?

  An object that is thrown vertically up63y m+gwyh cq4ward will return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will thih43c y+m6ygwq s result be altered?

  An object can have zero velocity and nonzero acc0;, gs).zxvh x4gtj zn3n+m wbeleration at the same time.

  An object can have nonzero velocil/x(wsbk 5.wr ejvr7 )ty and zero acceleration at the same time.

  An elevator moving from the second 47mt9 )autfg7ozi: csfloor to the fifth floor making no stops along the way has zero accelest ia 9oztgc77f4: u)mration all the time.

  A rolling ball moves froem f1zvui+6lo;9g y)y m $x_1=1.8 \mathrm{~cm}$ to $x_2=-8.1 \mathrm{~cm}$ during the time from $t_1=2.3 \mathrm{~s}$ 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 $t_1=-4.9 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=3.9 \mathrm{~s}$ is at $x_2=7.6 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight comt8x9 +od:ms,)saxcl t3zvb 5rplete laps 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 line, moving 1lj ntj*m8cx 3f4h q/+i-im oq405 m away in 8.5 s. It then turns abruptly and gallops halfway o-ftnli m8iq c3x*h4j/4m qj+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 from-ktw )7u)e iiy $12 \; m/s$ to $22 \; m/s$ in 5.5 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 fro5sv4m *o;+zy ew bjv3j/t5 flkw h;mh4m $18 \; m/s$ to rest in a distance of 63 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speeu zik a /mu0ls*-oexge3 ;5ll+d of $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.7 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top sp 842qz d/rlq5vd*mr 8ytcr/tyeed about 8dyv rrcr*8t ldzt5 qm4y2/q/$11.1 \; m/s$ in the first 10.3 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 unifozz- 9fshn y/5lnh -hg3cq x+d0rmly from a speed of $18 \; m/s$ to rest in 4.16 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 6b w;rwmzsji -k 8*ja;agn) )r92 m long on the highway. Assuming a draw*jig; 6 w;-a)8kj mznbs)receleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goi1 kcgr4sr)o)i y9wp+ hng $25 \; m/s$ 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 thair:7sqr crkz-+k;ltzcy :0z( n 30.0 min. After exactly 27.0 min, thyzrrrc 0(z :qc: s-;lztk7 ik+ere are still 1100 m to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$