Suppose that an object travels from one point in space to another. Make a comp3,w lnomg2t:i arison between the dis 2mitn3ol: g,wplacement and the distance traveled.

  When is the average velocity of an object equal to the insq0dys:k45hzp mlimk+ h+k.u2 tantaneous velocity?

  A new car manufacturer advertises that their car can go "from zfs d8drhc 4q1sh1h(/h)u -vtqero to sixty in 8 s". This is a hsh)c qh4vsqu11trd( 8df h/- description of

  An object moving in the +x axis expebcghwhj:k y9s cr3g9 f02l(/op5irz5riences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car travc xar al72j2 e;va5ipds 9md 8iq(3x-weling to the East (+x direction) begins to slow down as it approache l m c2a5i;asvex x3wa7i9j28-dd(qrps a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling tozf1 ux :1u*eau the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning1u1u*xaeu: zf its acceleration.

  Suppose that an object is moving with3 dp u2dvqln-; a constant velocity. Make a statement concedlq p2vd-;3 unrning its acceleration.

  If the velocity of an object is z.i,t,m woc/ : grtrgba gp**y4ero, does it mean that the acceleration is zero? Sup tpoyirg .:gw*,bar,/*gmt4 cport your answer with an example.

  Can an object's velo lsfs:abf2 :l8r;0zu(zv3 w4vhfm+vrcity change direction when its acceleration is constant? Support your answer with an example.vr3 +fz 8 24u;lsar0svzwbf (h:flm :v

  Suppose that an object is moving with constant bumu k(mezt5 s*q0b13 acceleration. Make a statement concerning its motion w1eumb3(bs5t mu kz*q0ith respect to time.

  Can an object have increasing speed while its xv*sen6n wf.3+z;1w dh soy w:acceleration is decreasing? Support wxf+1*nso yw;n3dve:w sz6 .hyour answer with an example.

  Suppose a can, after an initial kick,+w caxpdo9g0; moves up along a smooth hill of ice. Make a statement concernx 0+ gpo;9dwcaing its acceleration.

  Under what condition is aveslg4 mt5 lq4)crage velocity equal to the average of the object's initial and s5gl)m cl4tq4 final velocity?

  Objects A and B both start at9hm c y+lfmd, d0g7x-n rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of object Bdl-7,yhcdgm m f n09+x?

  Objects A and B both start from rest. They both accelerate q /xzj(f 3fe8fhcv) b9 d4vfb0at the same rate. However, object A accelerates for twice the time as object B. What isf8j3(f/)d xvff90ve qbc 4zhb the distance traveled by object A compared to that of object B?

  When an object is released csjr5k zw; v(oryxz6h;x+l8xdny)4 4from rest and falls in the absence of friction, whichkj+h nr) 45r;ox sxx dyv;lwcz4 (8yz6 of the following is true concerning its motion?

  When an object is released from ress ;c0 iuqn-m 1-6xzbgct and falls in the absence of friction, which of the following is true concerning it6xbg-cqc-si; 1n zu0ms motion?

  Suppose a ball is thrown straight up. Make a statp octo,)h4 bb9-cf2srpme9x qdjm0 ;53y lbx0ement about the velocity and the acceleration when the ball reaches the hi 99bc350hqpe- oms4 ryjb0xfpmx2bc d,) o lt;ghest point.

  Suppose a ball is thrown straight up. What 6t*7x,xj+cvqx5b84eh e-/dj j3 kh* svdzq eois its acceleration just before it reaches its highest po6+ zexb jk*v 4txhq-*cj jdxod/ e7ves3q,8h5int?

  Suppose a ball is thrown straight up, rp.p*lxupnkp)1b7 n )ee9 +zkgeaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball1bk pn* p+9g7klp .pne) zuxe) is going up.

  A ball is thrown straight up, reaches a e+;8j9 a -bm3spmj jlcmaximum height, then falls to its initial height. Make a statement about the direction of the velocity and accelerat jpbj+c 9m3mejas-;l8ion as the ball is coming down.

  Suppose a ball is thrown dowun(kuj b9:(laqv : m0jnward in the absence of air resistance. Make a statement concerning its aqk :ul0mj( bvjun: a9(cceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her accel98c y6sn;jyrveration when she she reaches tj6;r vsyc8ny9 erminal velocity?

  A ball is thrown vertically upward with an490w0 jfdadt 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 t9d 0tn0fd4wja imes higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. One s)jgjli1:3b o3eu 2 es:/wr yzx y0dlg5econd later, ball B is dropped from the same building. As time progresses, the distance between trzy/eg e 0)gsoux5j1:i3b yll: wj3 d2hem

  Ball A is dropped from the top of a bui cmca ul8 c4ap:y osh; axu85.b1qb(w8lding. One second later, ball B is dropped from the sub( pq 1uw;xaccoyc 888 hsma4a5b.l:ame building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One i q i*mx9hsp1)6ax8kt9rihlw 2b7 a;las thrown up, and the other is thrown down, both with the same initial spe1 ;rxm2qhw ii) x7ha8a9 b k*apts6ll9ed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is throb1iv kss,hd19 wn straight down from the same building. They are released at thekdh1bvis,s 9 1 same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity1o4y+f p m6jcs in the +x axis. The position vey6om 1jfpcs4+ rsus time graph of this object is

  An object is moving with constant non-zero acceleration in the +x arnyrk68 hst5ge8 4( xjxis. The position versus time graph of ter68r8k(5y s 4jhnxgthis object is

  An object is moving with constant non-zero velocity in the +x axis. The*yxdo v,mtoh16d9t kzc 2li(* velocity versus time graph of this om(okc*1,zylho t9id 6v* d2 xtbject is

  An object is moving with constant non-zero acceleration in the +x ax/5;sv -swxd wrzh6a 0, a6enqkis. The velocity versu6z -rha;6aeswvx wd 0ns/,q5k s time graph of this object is

  The slope of a position c c4e2c0::tt.ga; ssmqkpu8j versus time graph gives

  The slope of a velocityeiv0r d:zw.6l versus time graph gives

  The area under a curve in an acceleration4do4j di,ejg6 versus time graph gives

  The area under a curve in a velocir8xm eq6ve78j o; yw0nty versus time graph gives

  If the position versus time graph of an object is a hor2.z ai ot/r(irizontal line, the object isr(at .i ior2/z

  If the position versus time graph of an object is a vertical line, thua0md *fgznc +1m-;nkosy 8.he object iszu 1yg-mc mo s*nk+a.fd0h;8n

  If the velocity versus time graph of an object is a horizont:h s:l6cbny at+az9 g-al line, the object a ncazb+ sh lg9:y-:6tis

  If the velocity versus t0reruiw)+db- f k;g8tpfkq7*ime graph of an object is a straight line making an angle of 30 degrees with the time a7;irf 8ktb)wg*dq0f + k-upe rxis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find bozc2wgce4 (m) mth the distance traveled and the m(c ce4 mgm)z2wagnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will 8-xpc*pg2+u zpitzl 0 5pb/uait take to move 12 km upstream in a river flowing 6.lg8 ax 5zb2-pc0 zi*u +/putpp0 km/h?

  55 mi/h is how many m/s? (1 mi = 3 5pr2+vgxbbf1609 m)

  What must be your average speed in orde: udkxa.cp/s0 oyi8 2+fz c+ufr to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. What2jf -s3 0g8fjli/ 1 ggrgyhj,b is the average speed o jj2hjg f,8gi0l3/sy 1gr-gfb f the runner in m/s?

  A car travels 90 km/h. How long does it take for it to lqd3q x2e+at 3p)mg +rtravel 400 km?

  A ly (light year) is the distance that light travels in one y7z itwkd:-u50lk oy9 year. The speed of 750d o wtyl9y-uikk:z light is $3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

  If you are driving 72 km/h along a straight road and you lookw m: 9b+nadyzk v )p6 zb(u/,ychd-l;b to the side for 4.0 s, how far do you travm+hcv-6 bdpd u9y ky/a;lb(b)w zn:z ,el during this inattentive period?

  If you run a complete loop around an outdoor track (400 m4ox t2qoz vh7 **hu.dj), in 100 s, your average velocityd.jxo2hou7* v z*hqt4 is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km4y alseb-.yoh( o7+y ey*-h:udjp kg+ east, then 1.0ob4kdoy7. yp :gshale+*-(-+ ehyjyu km north, 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 ) 6.aw9mccq sbuhdbip;)j 4u +east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. ;a.w+ isbj6p 4 uc)cmqhbdu9) What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles. It t(dl.,r tvun 8jhen starts to snow and you slow to 35 mi/h. You arrive home after dr(n8rj. l, utdviving 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 az b hk/e+c31n9 u.;2m 28 mrgx.ogypod/zqhnthe average speed of the motorist f 38/2;bexzrhhm/1noc kmg dg +.a 9oq .nzuy2por this trip?

  A motorist travels for 3.0vwy8mg59 yv4i h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the tvigy 4y mvw895rip?

  An airplane travels at 300 mi/h south for 2.00 h and theqtb 9;jhe:v--c/h*etx xw0j an at 250 mi/h north for 750 miles. j/ta qv0b- te-e;*c hjxw:h 9xWhat is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100ujk e- iqeva5 u3:h+1l 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 1ej3-iv+qa :ku hule5 leg of the race, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop aoh (za7efzib1( 4 fad7fter 11 s. The car's average velocity during deceleration was 62 km/h. 77 e(daf 1(za bzhio4fWhat was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the averagu)a4gq- q.(vbi xp(qye rate of a yqixq(.vp u)(-4gqb $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at a1hrz 7fs8kp vam/m 36the 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 r0 kk x6+mah;nnm+ /ujwest and accelerates at $4.0 \; m/s^2$ for 5.0 s, then maintain that velocity for 10 s, and then decelerates at the rate of $2.0 \; m/s^2$ for 4.0 s. What is the final speed of the car?

  A car travels at 15 m si(/* jpsf psn ca92 g,l(my0o2sznb8/s for 10 s. It then speeds up with a constant acceleration of0sj i ( pn2n8s9/pfm*2 ybo,s(gzlsca $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 6vomi/-8s y s8l.6 m/s experiences a constant acceleration of 8smy- islvo/8$4.9 \; m/s^2$. What is the cart's displacement during the first 8.1 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 539 m;b k wbv1 xlss ;mmk,:a). c)0nnx)erl/s strikes a sandbag and penetrates a distance ok bxn 1,m )nxmes)scl 0; w)lv.:arkb;f 65.97 cm. What 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 reazfupj6s4 :*do nl;j 5fches a speed of 42 m/s at the end of the catapult, and this r5 o6;jjl f:4* spnufzdequires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest inymu 2 egi5wxlxodg(/6n* u57;3dtp moves with constant acceleration 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/sk/uiyg7x 8,:oqos0 be to 80 m/s in a distance of 200 m. What is its average acgio/,ybu 0: xsko87qeceleration?

  An object starts from rest and undergoes uniform acceleration. Duq1 u thtk6hb p;e3o35 2qyy,gyring the first second it travels 3.3 m. How far will it travel during qyk 6phg5312b3yt;y,oq hue t the third second?

  An object is moving in a straight line with consta9f1dadg-uqkw+f)t x*+h; vvdt9) w ydcy /a;ont acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move fyd 9 cof ;+da/t)y +)wk1t 9; huxwgdaqd-v*vduring this time?

  A car starts from rest and gepugy nu*w)n igt.(l+3r/ 8px o*y z*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 dry road can decelerate at about uklb4aw(-p5 ;srqk6 f$5.0 \; m/s^2$ 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 traffisvoz p)/u:vpht l 96)zc light turns green, a car that has been waiting at the intersection starts ahead with a constant accele)6l upz t: ozhv/9)vspration 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 planelq:nt* aqkh * f ky+;2o3pqbr:t X where the accel: t;+q2oakrkpn:y qbqh* *3l feration due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upwa nfpxsy2); 4bt s(lct9rd with a speed of 12 m/s on the surface of planet X where the acceleration 2(f4)sp9lytst ;cnx b 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 surface of z:2w (+ uy4iedmlmg,7 ax.ema planet X where the accelerg+:ia.2 mawmxly47 ,du (zme eation 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 speed of*dkk df qk .azoc84jcc34(j0a 14 m/s on the surface of planet X where thezko .d4j34 *c8qckcjd(kaf 0a acceleration 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 homqmaf- 41rv*aj d,4dr lds a ruler between your fin m1fd-vm j,a*daq4r4r gers and releases it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity 6 d/qwoo*vpwddb25hz 7 ) s1bpof 19.6 m/s. What is its velocity after 3ddww/o 6 5o7q* vz)bb1shdp p2.00 s?

  A bullet shot straight uvemqg9j xe87f0j4 fh 5p returns to its starting point in 16 s. What is the initial speed of the bullet?e0fg v4 q7ejhfxj859m

  A ball is thrown straight up with a speed of 36.0 m/slv s:6n;3erm4 u+ wcyi. How long does it take to return to its stae 6y wsuv+ 4cn:3rim;lrting point?

  A ball is thrown downward from the top of a building e-k1 hpc :(z,a-qkt9-sv sgyrwith an initial speed of 14 m/s. It strikes the grou1k,gsta q spkhre: -z(c- yv-9nd after 5.0 s. How high is the building?

  A ball is thrown straight up with a .n 0fao8z*u,prxta-t ht)f 9fspeed of 30 m/s. (only fill in numerical value in the blan) ,ft-raa0.o8tu* h zx9ftpf nks)
(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 vzy)-6:lqr.yf(y ud ffh/r :hspeed of 39.3 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 5 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 5.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what vmj)zvy+m6k ve a ;s+8is the velocity at t = 1.0 s?

  In Fig. below, what is the velo:sr2e c 3+piuq4 +bj*38 erpiyq3vyd mcity at t = 2.5 s?

  In Fig. below, what is the vel .478bs2e95g-pbt2 tw8 xgyvokkl f jzocity at t = 4.0 s?

  In Fig. below, what is the velod njk(h n36sv/city at t = 5.5 s?

  In Fig. below, what is the avetwsu**xj *0 ) whscfc2k2 4n4m)ijiadrage velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity4) ;axhm)sk.a:lu b.+fvpw ed from 0 to 6.0 s?

  In Fig. below, what is the kmgojw3a b/w4:v ( zok- ,4xqpxotn 9/acceleration at 1.0 s?

  In Fig. below, what qw,w ying (h9)is the acceleration at 3.0 s?

  In Fig. below, what is ::t* lp eig95as*nhj)lr 6 o(r):vflm, xyubjthe average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to i xwh6svaewdhjha(gv,r7-kz;9 f6t07 g8 :sg 8.0 s?

  In Fig. below, what is the displacement from 0 to pgs ys(xf;l:hw t89 9b8.0 s?

Does a car speedometer measure speed, .*j-z7vs ni//m(k gqclrm9i hju,6b uvelocity? {speed|velocity}

  An object can have a varying speed if its velocity -:6e):hth 9uh(edxpw9kk pfp e ,vdx8is constant.

  The velocity of an object can be negative whv b4 r bv 4(dl.t)h8vsn89hoh c6vg0jv54dmcnen its acceleration is positive.

  If one object has a greater spe;36(cv8c m jxa x9qn9bbd xkj1b8i 4mped than a second object, the first must have a greater accelec6jadq(xbb9 v p3bx8 4k1; jxic98mmnration.

  Two cars emerge side by side frou0(xz9;gqcrbg: r +zp m a tunnel. 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 incq wlv:w e,txg, a/d(h.reasing in speed as its acceleration decreases.

  A baseball player hits a foul ball straight hj( jqm bwz4cm *y11jtdo2+5t up into the air. It leaves the bat with a speed ob+tmmwj4 (* c 1jyh5z1jq2tdof $120 \; km/h$. 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 happeninjk.z0bxgp0*2jsy zth y)m 2l;g to its acceleration, how does it change if air frictiojh my b0y.l gjxt) zkp2z*;s02n is ignored?

  As a freely falling object speed+ o0 jiee*vk hfr-96g2fp(mlls up, what is happening to its acceleration, how does it change if air friction CAN N g-llfekfrj69 i2 +*(m0v hepoOT be ignored?

  An object that is thrownz x.+ 3drv0ixqm2jgz8bk-c:n vertically upward will return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is apg+x0q:d.zc8 vn- 3kjbri2xmzpreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at the - z.sxd eav71lsame time.

  An object can have nonzero velocity and zero accele2gj3qcalho 9u 1dxyi +z9 h0w) c+ceg.ration at the same time.

  An elevator moving from the second floor to the fifth floor making no stopseno+ 9y fe0mu9 along the way has zero acceleration all the timef0y n 99meuo+e.

  A rolling ball movese)ih1b;8 siac from $x_1=2.3 \mathrm{~cm}$ to $x_2=-4.9 \mathrm{~cm}$ during the time from $t_1=1.0 \mathrm{~s}$ to $t_2=5.0 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.1 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=4.1 \mathrm{~s}$ is at $x_2=8.0 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarterio 7fj :ttx/3h-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.9 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+gh su2 vaye/0e 6yhl 49wvxm* 105 m away in 12.5 s. It then turns abruptly and gallops halfway back in 4.7 s. Calculate (a) its ag4ma2e* 0vyhxu 9vy/6+w eslhverage 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 .2rjaeh/b 4td4i3ga s $12 \; m/s$ to $22 \; m/s$ in 5.2 s. What was its acceleration?  (数值)  $m/s^2$ How far did it travel in this time?  (数值)  $m$ Assume constant acceleration.

  A car slows down fromwjf sbdri a,.52nm21s $16 \; m/s$ to rest in a distance of 67 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed /llg7i0ej1fhof $25 \; m/s$ 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 speed *njeq/s.z 5om aboutj*zs .no5e qm/ $11.0 \; m/s$ in the first 13.2 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 f g qpzu lxi if))y+17nc(b3n4nrom a speed of $18 \; m/s$ to rest in 4.14 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop,r5 (3-4c.cgxa vm:losfsgc* f a car leaves skid marks 92 m long on the highway. Assuming a dmo(5gxl a3fr:-s4ccfv * .sg ceceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trxkxe5y)mq;dm :3/asb q min6 -uck 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 30o28h3 0j3 dcxqhxkpp1 .0 min. After exactly 27.0 min, there are still 13ox dch8kqp xh102p j3100 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?    $s$