Suppose that an object travels from one point in space to anotherhy ,oi+ ,a.qwz. Make a comparison between the displacoaq.y,z ,+wihement and the distance traveled.

  When is the average velocity of an object equal to the inm (9o 2/phtk e(hjnnpb7pe9 3estantaneous velocity?

  A new car manufacturer advertises that their car ca0s v+n y05 c1;z 6q75nihagdwrhtmw1kb(rio1 n go "from zero to sixty in 8 s". This is a description o n;5rhwrsn y0m67dwgb1hoq(1kt1za+ 50ivc if

  An object moving in thu 9zr;tbp-c- o-ro(sge u5ruo5 qtt48e +x axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the3i5 yv1bv/ mqq East (+x direction) begins to slow down as it approaches a traffic light. Make a statementq5/v1m3qbyiv concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow drp n15l+hlla 8own as it approaches a traffic light. Make a stl1lprn58hl a+atement concerning its acceleration.

  Suppose that an object is moving with a constant velocityd bpha 2 5(yq(/p5tbis. Make a statement concerning its acceleratb/pt dsibqyhp(( 52a5 ion.

  If the velocity of an object is zero, does it mean 74j;l x vrn5rethat the acceleration is zero? Support your answer with an example.nr; v74jr lx5e

  Can an object's velocity change direction when its acceleration is constawlv-h- 0zi5iictj 4/b pm),bant? Support your answer with an h tl),j-avp0 bb-5 w4cm izii/example.

  Suppose that an object is moving with constant acceleration. Make a sc0f07 lebl i4s5owoor4b0hy ,tatement concernise0 ylb0i 4oc4 7w,5oblf 0rohng its motion with respect to time.

  Can an object have increasing speed while its acceleration is dec4b08elr yev*(h ;7sdpkxt 4 boreasing? Support your anspxbertoy*b(; 8 0dshkve44 7lwer with an example.

  Suppose a can, after an initial kick,km2 n8.zsee9srp (/ t 5shuz1a moves up along a smooth hill of ice. Make a statement concerning its accelenk.e9epstsmas 8 (1 zu/5r 2zhration.

  Under what condition is average velocity equal p rlxsz(7 khcn bwf qvv+r.((+:a;i3ito the average of the object's initial and final veloc(;cb+hva f(i3k:7ql v+ nr xpswi(.rzity?

  Objects A and B both start at rest. They both accelerate at the same rate. Ho1t; rq2oe 0pxmwever, object A accelerates for twice the time as ob1t2er ;xo 0qpmject B. What is the final speed of object A compared to that of object B?

  Objects A and B both start frf(q ix1d m0nty)/9mb aom rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the dis9 qbm/(tixndy1fa0 m)tance traveled by object A compared to that of object B?

  When an object is released from rest and falls in the absence of f:fcj m7cxfd 6ji/ug,po +(hs3ob 7)iy riction, which of the following is true concgj,x p7 7ouf(f3o c+ )i6cmsiyb:/djherning its motion?

  When an object is released from; zkf,ap 9z4 kaia,9nu rest and falls in the absence of friction, which of the fo9zap i,f; uk9znka,a4 llowing is true concerning its motion?

  Suppose a ball is thrown straight u y*43ye sbd+c jdhd) v1:6eazgp. Make a statement about the velocity and the acceleration when the ball reaches the highest point.y3*dva1)sddjeh bg :+cy4z e6

  Suppose a ball is thrown straight up. What ih o(yh;ku7y )cs its acceleration just before it reaches its h7ky cuy) hh;o(ighest point?

  Suppose a ball is thrown straight up, reaches wh4ip2*x h hmwg8u9k *a maximum height, then falls to its initial heightiwkg * pu2h84 9hxmwh*. 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 maximum height, then falls to o7 70 xffn1un mwoqi);its initial height. Make a statement about the direction of the velo7;m1fuo q0wo7x i nn)fcity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Make a scn+v 7vik:e ima .78uwtatement concerningv eik.cvu 8win+:7 7ma its acceleration.

  Suppose a skydiver jumps from a hig,wt bafyhu/x74 n(th v7x0 ,thh-flying plane. What is her acceleration when sb 4/(tthhx7v f,wn,07xh a yuthe she reaches terminal velocity?

  A ball is thrown vertically upwardih lnx1 yt0zj7,+.lgtikv;)j4w /iz d with 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 se.;ihy j0zxj4+w/vzilk tgi) dn1tl , 7cond ball go than the first ball?)

  Ball A is dropped from the top of a building. One second later, ball B is drorfw/4sx/z 8;e rn z/kqppeqz/s/e4z8/rkn wx;f r d from the same building. As time progresses, the distance between them

  Ball A is dropped from xu*zg-g db g)r)*(g gjmhe; dg2(j,awthe top of a building. One second later, ball B is dropped from the same building. As time progresses, the difference in mhjb)a gjg gdx2ez-**u(;grg)w gd(,their speeds

  Two objects are thrown from the top of a tall building. One a8gh+im8d*r o91n7/7 hltiw ykuw sw (is thrown up, and the other is thrown down, both with the same initial speed. What are their spe+mnshiht(8lwagowy 1k 8u/r*7wi 79deds when they hit the street?

  A brick is dropped from the top of a building. A second b5x3ggo+8gf3 v kioa+ ;rvs9ni. e2 muurick is thrown straight down from the same building. They are released at the s2augk ogu +rfn3ivi ;9sm8e3 5vgx.o+ame time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constanx;.ardb 6()ovc n)3:wvsrgbat non-zero velocity in the +x axis. The position versus time w (sovvbr.gad)c3narx); :6bgraph of this object is

  An object is moving with constant non-zero acceleration in the +x abh9 62krc 2is ugm4:ikxis. The position 4uisrb2hm6: 9k2gckiversus time graph of this object is

  An object is moving with constant non-zero velocity in the +x axis. The velocnsu( vo1m m.mb7iv2* 34 .7cld r x-:ouwazkbpity versus time graph of this o2rd*v-oacbk(s .4i.muo 7l1xb 3 m7nu :zwpmvbject is

  An object is moving with constant non-zero acceleratio0nt, )rqdc lbn+ve ah16g;8 sgn in the +x axis. The velc,vs6rt)b;+gh n an8gq1 del0ocity versus time graph of this object is

  The slope of a position versus tim(fw/h dqpd7a2a8odvxwwi.* 5w6 mpt7e graph gives

  The slope of a velocity versus time graph g09imj 7 l:kidbives

  The area under a curve in an acceleration versus tica z0+qm,vln-me graph gives

  The area under a curve in a velocity versus time grapn d7(: 7 k7wiaucpae,uh gives

  If the position versus time graph of an object is a horizontal line, theg rcld6q5ze )hxtck ;n4*2m-e object ie;6m) lqk*gcczethn52 - drx4s

  If the position versmyl9 k/ws4k)a:6 xi*e f)tql3.jdaipus time graph of an object is a vertical line, the object isqpwtds4jika9)ea.*lxy m6 li:kf/ 3)

  If the velocity versus time graph of an object is a horizontaha-e+d-u 2 pbktew 9n,l line, the object isdb epa2k+,hnw9 te-u-

  If the velocity versus time graph of an object is a strl (+1m3/p8yy ow m8a*erudkwpaight line making an angle of 30 degrees with the time axis, the rpeyd +8k/lmwu1 way 8mo(*3pobject is

  An object moves 15.0 m north and then 11.0 m south. Find both the distance traz nbvt 973twy9v v7znty39tb w9eled and the magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long w g3w8k4aoqw:nve72mf ill it take to move 12 km upstream m wo:843 7ka wfqvgne2in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 164+ 7 r wl(atwxc:g4lth09 m)

  What must be your average speed in order ay+b(,u8,qo( uw ccos0pp x/ito travel 350 km in 5.15 h?

  A runner ran the marathon (approxigtx6k:2 9zvglr3h 4v.ti0k gymately 42.0 km) in 2 hours and 57 min. What is the average speed of the vtgr.y3z gv6k 4:gh i0 2kxtl9runner in m/s?

  A car travels 90 km/h. How long does it take for it to travelwp251lv zqxap2pg 4x, 400 km?

  A ly (light year) is the distance that light travels in one yhu6 ;pufm5x n)ear. The speed of light f;uxhu mn 5)6pis $3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

  If you are driving 72 km/h j9tv e(0ktm6bv-qzz5w z5 mc4along a straight road and you look to the side for 4.0 s, how far do you travel during this ik v046cj5z9t -qm 5vze bmz(twnattentive period?

  If you run a complete loop around an outdoor track (400 m), in)1: nke-hyyrt7u .uu) v-kohc 100 s, your average velocir k )y1u :kec o)thuv.yu--7nhty is

  A polar bear starts 23nhaxijf 3x8od12 mxat the North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km nort hj22x13md f 8xxi3onah, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km eawv,3 :sv h;mc;slc,vii ba zt875co9ist, then 1.0 km north, then 1.0 km west to return to its starting point. This tript3zcs s: vm;;ci laiohc,v iw597 8b,v 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 they70qju , +/2cxybmao wyqt*, un starts to snow and you slow to 35 mi/h. You arcm*7u, +b x0 jqtqy w,yya2uo/rive 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 10jg +shmoss/oj.b/tc +pmq f,. q 79rn,0 km/h. What is the average spe,/ s/sj+ sn.7hj9+tfoo.gr bpm qm, cqed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/dx:-otk;d *jq uz d g2+n)apuzm 73aw4e1hfc0h and 2.0 h at 100 km/h. What is her average speed for thun 3 qg:cfj 4)eozddw0d-zx+;7*1autam kp2he trip?

  An airplane travels at 300 mi/h south for 2.005q 8dhnqpg.b- h and then at 250 mi/h north for 750 mihg8qn5 b-p.d qles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the lwep f./ p8+0oz9jdm hbast 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 108om9hf dep./jw 0 pbz+.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 af8s .wu+2ye-klulp ndxc/u ,;qter 11 s. The car's average velocity during deceleration was 48 km/h. What was the car's deceleration while slowing.un ky sw/2 l8ul- ,eudq+xc;p down?

  An airplane increases its speed from 100 ma b5 carej,s;9/s to 160 m/s, at the average rate of ,rb5;a j seca9$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the n fue*zwyk3a s932 knl,a0c5n n0xcl9rate 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 accelerates8ex129l7u3fhpe- ynlz akxfe2) i )ji 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. Itlsb5x9trve nn 0v+ 2wkn.0 coeb13*jxhad5q3 then speeds up with a constant acceleratio20o 0.xa qv5w eek9 ldc*+bj35xbhv3n snrn1 tn 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 6.0 m/s experiences a constant accelera+ vwl+ 7gdf94wu uesml8 5 1o7;jiznz:no4tq ztion of j98o4g1swdv+omzq+iz:ulne 7f l 5 tnuw4;z7 $1.5 \; m/s^2$. What is the cart's displacement during the first 4.1 s of its motion?

  A bullet moving horizontally tookhn*c9.v( r teo 7mw-pv. cxx5wq;5 nz:; gqp the right (+x direction) with a speed of 539 m/s strikes a sandbag and penet5v *wp .ox:-g(mcq vp.zc9;rk nt;q5wxh7n eorates a distance of 91.72 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane i ;be3ri f+gl: +nhgcg4sf/4sw s launched from 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 constant, what is the length of the s;w: egfcr+sgb/f4lih+n43 g catapult?

  A car starting from rest moves with constant acceleratigkw3 j4bt eq rc)88nv;on 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 its ahwsbu:8h/+ (gkjhb 5va +q:vkverage accel+ hk 5bkgvqhb /wus:va+(j: h8eration?

  An object starts from r u8*w,te2 ywlzest and undergoes uniform acceleration. During the first second it travels 8.5 m. How far will itu2t8zww,e y*l travel during the third second?

  An object is moving in a straight line with constant acceleration. d97 otolg c7;c Initially it is travd 77ocg9otl c;eling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniformly at. azma5y4r7j z $3.0 \; m/s^2$. 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 decelerate4r7cd,g*g v nv 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, aqfp/odie )3(l0un-i st 1ns*o car that has been waiting at the intersection star *sn3s1tnq)uo-(lf0/odip ei ts ahead 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 with a speed ocqq )rw2;1awio5ae3genvp ke,)b .d ) f 12 m/s on the surface of planet X where the acceleration due to gravity isea,p)2avw3dg ;kne.5)qb)q ce1w oir $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward wi41qty fboxsu, /.qtz )xd3cr7 th a speed of 12 m/s on the surface of planet X where the accelerat)y7zdxtr ,cos3b qx.41/qfut ion 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 surfa si7nlr erzg ,r7(h1 +ddf7(ozce of planet X where the acceleration dhgr ( d+l z7erofrni17,d(7 zsue to gravity is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

  An object is thrown upward with a speed of 14 m/s on the sur3q5 58zdwm ;kotn9hv kface of planet X where the acceleration due to gram;k z3nok vd5wth85q9 vity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greates +/b8e 1-:mzryy bwpnr than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall befor/s-bmyy8n+r e :bp1z we you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. Whnq7qh.3-m hmeat is its velocity after 3 nmh qh7.q3me-.00 s?

  A bullet shot straight up returns to its starting poinbs 2v:idru;o/ 31a trgt in 13 s. What is the initial speed of the bu brv:2d 3/ur stga;1oillet?

  A ball is thrown straight up with a speed of 36.0 m/s. How lom ;f0+hpo b1jong does it take to return b p1;h0 +ojofmto its starting point?

  A ball is thrown downward from the top of a building with an initial spe 38bu 2kuhzopl,l:f3k ed of 21 m/s. It strikes the ground after8bl32 khl:ou3zu, fpk 6.4 s. How high is the building?

  A ball is thrown straight up qpkk;3 mt7f7c44bpf-4 3 jl drz;-b :fdcwsvvwith a speed of 30 m/s. (only fill in numerical value in the blanks) zl-fqkvmdc-4 db7 v;334kb;ftrc4f7: wjspp
(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 it* ub6re 2 k*vk2bph+up into the air with a speed of 49.1 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 12 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 12.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the vn7*v ay ;35 g3y2eokafi5ghi qelocity at t = 1.0 s?

  In Fig. below, what is the velocity at t = 2.5 s?d:;,/ eof 6tlx mwh6wt

  In Fig. below, what i6 rij:l a6j6vks the velocity at t = 4.0 s?

  In Fig. below, what is the velocity 4:wrayqob,;7lyuh w8at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 0)e) dmt owlo(xew.b9to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6.0;i fh nqb3wce0+anmnr .4j.u: s?

  In Fig. below, what is the acceleration at 1.0 s- . l0botcxhy;ncj.) a?

  In Fig. below, what if-xzok v-5 r aheg:2;pchhs( 3s the acceleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0 rij c,vs 1/q/o9u clat932zhua w *vf*s?

  In Fig. below, what is the averagnm)ea ntn3e.z cwtoc6):r(*l+gn*k ge acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 tovo1)0nv n7r2e adl p,b 8.0 s?

Does a car speedometer measure speed, velocity? {speed|veloci 7hwj 10b5ydlwty}

  An object can have a varying speed if its velocity is constant.m ze6a:7m1qme

  The velocity of an object can be nevc;0.+yt-azeks* x0 c,y qjj hgative when its acceleration is positive.

  If one object has a greater speed than a swdwgxha0kh 9)6y,ggupz7 3- q econd object, the first must have a greater acceleryh gd6qww3 u0 a k,xg)7-hzgp9ation.

  Two cars emerge side by side from a tunnel. Car A is traveling with a spe,cxv ;)unet1eed 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 * 3 -0spr6zps(gqx otydecreases.

  A baseball player hits a foul ball straight up into h*fd fv0 6*taz pkva+-the air. It leaves the bat wd h*vt-v zf p+ak0*f6aith 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 speedv w/ xea**.)fshm/v0 x v;wvwqnbgo.5s up, what is happening to its acceleration, how does it change if air fr w .v m*wbo;a* sh5gfx/) nv/w.e0qvvxiction is ignored?

  As a freely falling object speeds up, what isn /9ig /chrow8 happening to its acceleration, how does it change if air friction CA ch/ og/8rn9iwN NOT be ignored?

  An object that is thrown vertically upward will return to its origin:p03kcxflh+w;a,8kh 4mv sjfj,t ef(al position with the same speed as it had +;w(f v4:j k efctp,m0hjhs3la,f8xk initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero ,;zw5 k a:vq0i7l 86mxghvah /svk;zc acceleration at the same time.

  An object can have nonzero velocity and zero acceleration alw*wl2qww m4rb 00gw5 t the same time.

  An elevator moving from the second 03v -dtrp2wxsroye37, gtc/2 u q/ghnfloor to the fifth floor making no stops along the way has zero acceleration all the time7 cry/ g3o2/g,pxnq s0-d e3 thwv2urt.

  A rolling ball moves jncp 71;fj vxx5kj:7j from $x_1=1.9 \mathrm{~cm}$ to $x_2=-7.3 \mathrm{~cm}$ during the time from $t_1=2.8 \mathrm{~s}$ to $t_2=5.8 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.5 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=4.2 \mathrm{~s}$ is at $x_2=8.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quapoor-v 4)dya* rter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.0 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from -u.gv+ q7 x8nean,zqb its trainer in a straight line, moving 88 m away in 8.7 s. It then turns abruptly and gallops halfway back in 4.7 s. Calculate (a)7,a n -qnx8v+ e.quzbg 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 frzq x7(cyy4z2 vom $10 \; m/s$ to $25 \; m/s$ in 4.7 s. What was its acceleration?  (数值)  $m/s^2$ How far did it travel in this time?  (数值)  $m$ Assume constant acceleration.

  A car slows down fromhasun alh (:b (hps);2 $19 \; m/s$ to rest in a distance of 79 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a suhtsh(qh8 ,4vxwu c5v:3k e 84bh) 8w -uvvuovpeed of $31 \; m/s$ 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 ouqc(i h)+mt5x.wth4 gqt of the blocks to essentially top speed about+iwct4mxhgh q5q.( t ) $10.7 \; m/s$ in the first 10.9 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 fjp(e 7vappg 74rom a speed of $16 \; m/s$ to rest in 5.49 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid macuhf*xr ,-6r arks 92 m long on the highway. Assuming a decelerufxhr ,6* ar-cation of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck go+0bplsj n9pfxd))akd93 fa- oing $25 \; m/s$ 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. After exactly:u8iev;bma) v d g)tz) 27.0 min, thte)vd)8 v)izba:mu; g 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?    $s$