Suppose that an object travels from one point in space ocu6z9z- k+tmdihci 77sj1r7i3*g/cd eg o+eto another. Make a comparison between the displacement and the distance trhm9 7 ogcd s z/e td776go kicuie-+z*rci+3j1aveled.

  When is the average velocity of an object equal to the instantaneous velocitzxh 1d)uku0lz77/d wry?

  A new car manufacturer advertises that their car can go "from zero to;to x 1:3xqjw7 xx7bzw sixty in 8 s". This is a description: zt xoj1x;wx7wb3xq7 of

  An object moving in the +x axis experiences an accel6, - .tfa6n ovgaelu:ueration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car travel9q/ua3qzh-) a2 pdco ding to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its accadhc qq2p a/9du3o-z) eleration.

  Suppose that a car traveling to the West (-x directeupwvs 27x.tf 61fl8u ion) begins to slow down as it approaches a traffic light. Mas f1lwuvp8t6 2x7efu .ke a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a statement co +c0ohb 3aq-ayncerning its acc+0ha-yac o3 qbeleration.

  If the velocity of an object irt g*z oqg4d,7s zero, does it mean that the acceleration is zero? Support your answer with an,zor *ggd7q4t example.

  Can an object's velocity change direction when its accele4a9vv .+*3 vuk* hzg quvgde;oration is constant? Support your answer with an exv9aqdoe v *v34gkv .+ugh;*uz ample.

  Suppose that an object z4qr*sz.8 a zdis moving with constant acceleration. Make a statement concerning its motion with rqs4z dr.*azz8espect to time.

  Can an object have increasing speed while iqx /ki r35v,om8td9fq/0 lxkyld8s y-ts acceleration is decreasing? Support your aq3/ll 5xf-xtoy98/8dysqk0v,kr di mnswer with an example.

  Suppose a can, after an initial kick, m7zpw-zdklr6hfb q2;n),i +r ) kras6loves up along a smooth hill of ice. Make, lr-irq2f;k+ z)zna b6ws7hr )6kl pd a statement concerning its acceleration.

  Under what conditions gz9;euy8n0y*,aaicze6g r 3q kcs;. is average velocity equal to the average of the object's initial and finalr;sz; *c93a.qnu ykzgiy,eg8s 0ec6a velocity?

  Objects A and B both start at rest. They both acceleratw6 wz9qjxc-8a1za+uq y7 mj.d nf u,a)e at the same rate. However, object A accelerates for twice the time as object B. 6udx9n z8. cq- zm7fa+y ajw1uwj)qa,What is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the samevj8rf6pz i)p:9.q ygyuea w3z46* jjq rate. However, object A accelerates for twice the time as object B. What is the distance traveled .iuj4jjwy66rg*v fq8)z p:ypq a 93zeby object A compared to that of object B?

  When an object is released from rest and falls in the absenceq d-v,j p5l 9ukbo7gxtbl8ekvg 0;1i8tu s ;8v of friction, which of the following is true concerning its moks88p1v8 e ,l uxgljb750-bv;9ug tdk ivtqo;tion?

  When an object is released from rest and falls in the absence of friction, u :y ;if3dz11 uyt:k wt;snftx6v.3kuwhich of t:yf6vwn:yu 1 duksiz3. uk tt3;1tfx ;he following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statemh (ye r 1.vqv9we*uon9 gbt1q:b ,ei6aent about the velocity and the acceleration when the ball reacb.g*, yitv 1qeqhbee n1o9 w:u9(ra6vhes the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just before it hs8u)pd.7+hro li hw 4m+qq)u*p 6kdsreaodu8 h+l4qkihd +h)wm) 7psusp 6.qr*ches its highest point?

  Suppose a ball is thrown straight up, reaches a maximum height, then fdt ytmg0zh 987 vt-hz)alls to its initial height. Make a statement about the direction of the velocity and accel7zztt0ym8th)- hgdv 9eration as the ball is going up.

  A ball is thrown straight up, reaches a m, ukgqxd:3*ku uz,xd3aximum height, then falls to its initial height. Make a statement about the direction of the velocitqkuuk3:,, 3xuzxg d*dy and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in th,mv78g t5h grlh9ivz(zzuo 6 +e absence of air resistance. Make a statement concernig9lz zm,iv+ ogu57vhz th86(rng its acceleration.

  Suppose a skydiver jumps from a higs o6 9e m,v3ikatz)pg0h-flying plane. What is her acceleration when she she reaches terminal velocityz)t,s6 mpoei9g vak 03?

  A ball is thrown vertically upward with a speed v. An iderd4 su5kp hs.em 2 4sjx-t.vf)ntical second ball is thrown upward with a spe)e 4fhskmujsd2v-prx.4t s.5 ed 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 s *xha.z3vy.: 4ma cd h1wqamq6econd later, ball B is dropped from the same building. As time prog.ha6mqv h 1z*3.ydw mqcax:a4resses, the distance between them

  Ball A is dropped from the top of a building. o/0. fk .ybdml One second later, ball B is dropped from the same building. As time progresses, the difference in their b yf d.0.ko/lmspeeds

  Two objects are thrown from the top of a tall building. One is thrown up, auwekn) i /szqq()8+ lmnd the other is thrown down, both with the same initial speed. Whau lesqzkq +i(8wm)n )/t are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is t+qsnje/hp :b yq2-x7ghrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of npxyq/ e-h7g 2qb+: sjthe two bricks.

  An object is moving with constantr6 cn(e5cd lc( non-zero velocity in the +x axis. The position versus time graph ccn (c5erl 6d(of this object is

  An object is moving with constant nu;enwe jcel7 y96s);i- s ;wveon-zero acceleration in the +x axis. The position versus ;vyj;7we) sse 9ecn-uie6wl; time graph of this object is

  An object is moving with constanibud- e2ib-4l t non-zero velocity in the +x axis. The velocity versus timi-ebb2u4 -ild e graph of this object is

  An object is moving with constant non-zero acceleration in thevch0f 2,49/hj j5le-eeyzs4 lzhbk:p +x axis. The velocity versus timeezz/l ,5vbe44hh20:k lef-jyj 9sc hp graph of this object is

  The slope of a position versus .e9,v1 v 66 nxf+pdh fqf(di-c rtsrr(time graph gives

  The slope of a velocity vepq/ v t,1edx+prsus time graph gives

  The area under a curve in an acceleration versus timel* ri-kr w85uf graph gives

  The area under a curve in a velocity versus 557idl9hxvww fa/ n2 ydo 5y-ptime graph gives

  If the position versus time gq5vbdjx02ad7 o 7hy-jq7ol x ,raph of an object is a horizontal line, the object 7 o,dyx5v2jj7q d-a0ohx l7bqis

  If the position versus time graph oj09 svqc4,wd of an object is a vertical line, the object isv csd,4oq90w j

  If the velocity versus time graph of an object is a horizontal line, t-mb.h 9e dtnt,he object bme hd ,.tn-t9is

  If the velocity versus c xxyg/vi6: ti(9o zy8 *w2whd/t6xfdtime graph of an object is a straight line making an angle of 30 degrees wfi w2 x/c66/ht:ty 9xvdi*gd(yw8 zxoith the time axis, the object is

  An object moves 15.0 m north and theew4*ed .( p --wr;hsetnq5jhxn 11.0 m south. Find both the distance traveled and the magnitude of the displacement vector.w 4deq5e-hxsh*wn.- pte;(jr

  A boat can move at 30 km/h in still watel qi uh(nya6m-6srf7/r. How long will it take to move 12 km upstla6rm is7/ fuy-6nqh (ream in a river flowing 6.0 km/h?

  55 mi/h is how many m/syilylt y3y4hb t/44k 2? (1 mi = 1609 m)

  What must be your avek3lm qo/ , -jwqqp(a)hrage speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approxim; bh:rk/ox2tz7n-nwv h-b 7euately 42.0 km) in 2 hours and 57 min. What is the averagebn; 2w7r7h-uhvkoenb: xz t-/ speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for csrw1n*xx5b c4; fa-i it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. The s hbnu7aa .yi9ht y:p-2peed of lath:uiybypa 27. 9h n-ight 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 gz 5 6eb:tm/trand you look to the side for 4.0 s, how far do you travel during this inattengbm6rztt /:e5 tive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, yercw5zt +d,w1 k:9p2 v77w ei.flenogour averad r w.9fel2 v 1 oww75ctznp,:e+7geikge velocity is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0p20/o7 of o7xd.)t ( dfxodc8-pdmapi km east, then 1.0 km north,dt(ppfio /dc a.dxo7 - p278xofm0 od) 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 Nxc*:3 elemzc3orth Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bea3*ee :xcm3c lzr's average velocity?

  You are driving home on a wee/nm1* n5c tviekend from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from schv1ic en/n5t m*ool?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is the h6b//yhqu3 7 vbeec*baverage speed of the motorist for this t hce b6h7ubqe*//3y bvrip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 10088znt :1wwl6taxoo *j s52xz qz-xo1u km/h. What is her average speed fortt-1x :wl5z* a1x2x6 oozsu z8n8wjqo the trip?

  An airplane travels at 300bi /q(hqfz m+xl )w-d2 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is - f(+) qzlm2b/wdqihx the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 momh,2h6n 4 t6oat4g z:cku8au) 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 tk:4 tazhtg,28 noho6ca u64muhe 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 afju83a cq vg( nd7n5g*7kda. p stop after 12 s. The car's average velocity during deceleration was 34 km/h. What was the car's deceleration while slowing dojd*.fu7 q(n8k g cag7 av3dn5pwn?

  An airplane increases its speed from s(s glft.f8c1f ;iw7d 100 m/s to 160 m/s, at the average rate of ;( f .lsfsw7fi gd8t1c$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h ac3nhio g5, rvy x+q3g9cdwt+bw-2k0iqcelerates 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 acceleew 1g lzt; 7a0ljq00fsrates 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. It then spekx hq:dr2q u70eds up with a constant acceleration7qkqr x2h0 :du 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 4.0 m/s experiences a constant accele; .xutxu5 nkoih0*,x gration of5ug .ut*xn 0h ioxk,x; $4.1 \; m/s^2$. What is the cart's displacement during the first 9.6 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of7 )kb owhb:0vq 228 m/s strikes a sandbag and penetrates a distance of 82.02 cmkhb:v w)oqb07 . 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 gu8cvt 75gb,ckaqbrf+z z +7). It reaches a speed of 42 m/s at the end of the ac8qkc gb7tu)zr 7v5gf+z+b, catapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant acceleration oix c ow3u f5*f*ajo.u.f $2.0 \; m/s^2$ 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. Whatbr(. df:+(ik9e x ltyn is its average acceleratiolex:d.b( yn (i9f+krtn?

  An object starts from rest and undergoes uniform accelerwhngitfr(w - oo bj4)vqv; zk g.j-x+)6ln2o /ation. During the first second it travels 4./ok iqwv o-gjlwj)b 4n;(gz).-f v+2xnto rh64 m. How far will it travel during the third second?

  An object is moving in a straight line with constant accej++l.; zadu3yhsu. m ileration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m3ys ;au. + dh+iujzl.m/s. How far does it move during this time?

  A car starts from rest and accelerates ujx- d2(0j+ap r gd6edsniformly 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 can7fema6n tm2 yh3/tm z1 decelerate at about $5.0 \; m/s^2$ when braking. Suppose a car is initially traveling at 55 mi/h.
(a.) How much time does it take the car to stop?    $s$ (only input numerical values)
(b.) What is the stopping distance?    $m$ ((only input numerical values)

  At the instant a traffic light turns green, a car that haojm*/9t xb lqbd8j s yq7d e.6ug+w1i2s been waiting at the intersection starts . l6tb/2dbs d 7i1qjgmw yqxe98 uj+*oahead 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 of 12 ql/de98 3emp28/nzheeo zl/t m/s on the surface of planet X wher de/eqn e8let2 3hm/ zp/9zol8e the acceleration 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 sp(ez9hp8tp. n4p qq 3durface of planet X where the acceleration due to gra3 4pp8 dq.ep9z nqhpt(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 spee0ismb8szm1 9 ldw/65ieg-vbe d.2 fid d of 15 m/s on the surface of planet X where the acceleration dudf90i185vg bdwizs.sd e26b mm-/ iele 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 k t v,jrdx,g dv27e0b-m/s on the surface of planet X where the a,7 xeg0d bk,rvdj 2-vtcceleration due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than 0.10 s. If your friend holds (m8gjr q*tatu*zf i:1f8i 3hya ruler be:ai8r1z(tqt j3hgmi yu*f*f 8tween your fingers 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 of 19.6 m/s. What is its velocity aft:3px b5 r-kx4bc-x 7z da6kdeher 3.- 7he bxp5x3ab:d dk6 -xzk4cr00 s?

  A bullet shot straight up returns to its sta03i a qo hu9z/nwo;uf;rting point in 10 s. What is the initial speed of the bullet?u q wzho;0of;3 in/a9u

  A ball is thrown straight up wito0;x vr(z*,p(biwwx -bpv f :eh a speed of 36.0 m/s. How long does it take to:*r 0x,owbb;vfv (i e- pzwpx( return to its starting point?

  A ball is thrown downward from the top m nxk0u*xuw9 7jv6ct a b.tg4.of a building with an initial speed of 15 m/s. It strikes the ground after 1.7 s. How high is the b9 .a*t4x.vmng xjucb6ku7t w 0uilding?

  A ball is thrown straight up with a speed ofgycl-xzpp y 073 .2tlvx3 oxo: 30 m/s. (only fill in numerical value i.:txovo3-p7yx 02zyg l cp3lxn 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 st(kca7 l ute .x/0)pa0ii8rh ymraight up into the air with a speed of 48.2 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 velocithgv3:ya lkc;:is5p*omz 44k ly at t = 1.0 s?

  In Fig. below, what is ct gad-;6b42ep8v bbt the velocity at t = 2.5 s?

  In Fig. below, what is the velocity ) ,(sal 5l xvcz;d.beb04xeg6aw4e hf at t = 4.0 s?

  In Fig. below, what is the v/bmhdt k g1s 8ayzn17dfd:l 81elocity at t = 5.5 s?

  In Fig. below, what is the average velocity fe;v k ef owx20mn2xg37rom 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6.0 k*llx rkpv xt7/7j m ,ybj02k)s?

  In Fig. below, what is the acceleration at xfi./t1c lk)b7r 5vvjfoe 9t;1.0 s?

  In Fig. below, what is the acceleration at 3.0 oe7*v m n.ykgn(0its4 s?

  In Fig. below, what is the average acceleracb5;zj bo6fwk )6ha :wtion from 0 to 5.0 s?

  In Fig. below, what is th:(.gbv u6vweie average acceleration from 0 to 8.0 s?

  In Fig. below, what is the dxu5 -8nmdhfx.ar6,/fzvx nz4t cj.t *isplacement from 0 to 8.0 s?

Does a car speedometer measure speed, velo(e7b(fk 9;hgl u.bsu* o,dwvqcity? {speed|velocity}

  An object can have a varying speed if i ypya42q/5d -h//ki2ahpd wgj ts velocity is constant.

  The velocity of an object can be negative when its acceleratio5dl zp5q-9.vtz2g jzmn is positive.

  If one object has a greater speed than a second object, the first musz ; yr575eyyhfuef 1l;fv ,h7vt have a greater acceleration.yuv hh;;fl7,v5 7ezye f1y fr5

  Two cars emerge side by side from a tunnel. Car A is traveling 2xx2jy4sanadk:1 4 hgwith 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 decrehod7 ketzr+o is1073pases.

  A baseball player hits a foul ball straight up into the air. It leattk/ (i t+-uoprv r8*zxdo67xves the bat with a sp 8ttrx/zi(to-+ vprdoxuk67*eed 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,kkcfkm p qsu:28 lo46m:;d3r b what is happening to its acceleration, how does it change sm234:frbuqkok plm8k;c 6: dif air friction is ignored?

  As a freely falling object speeds up, what is happening to its accelera3wctp5lok/8ixo(75 b9 pnfattion, how does it change if ap5x/w9b3 7tlpik5(fa8c o nt oir friction CAN NOT be ignored?

  An object that is throdza,4/( 4 iwf+yofe zzwn 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 appreciable, how will this result b z,f4i/4yzzeaw( d+foe altered?

  An object can have zero velocity and nonzero xb4*t (4t,kpa 9l c+qnjzqd r+acceleration at the same time.

  An object can have n3/odjmmn.at3h s ade :5w*m-ionzero velocity and zero acceleration at the same time.

  An elevator moving from the second floor ta0o239 ,)fhc ;3zg0zab2bz mi wbof ija0ka 1so the fifth floor making no stops along the way has zero ,a13o0bbw ;a0aaz20z zhfso2cjigkifb 3) 9m acceleration all the time.

  A rolling ball moves(pn3v/tw07f dcbx awnu* -e 3z from $x_1=2.1 \mathrm{~cm}$ to $x_2=-7.7 \mathrm{~cm}$ during the time from $t_1=2.6 \mathrm{~s}$ to $t_2=5.5 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.3 \mathrm{~s}$ is at $x_1=3.0 \mathrm{~cm}$ and at $t_2=3.8 \mathrm{~s}$ is at $x_2=8.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-mxj7ui)j 3m5 srile ($1 \; mile = 1609 \; m$) track in a total time of 9.8 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away . ujk; 82ab 6u(cxvoxlt q(r/gfrom its trainer in a straight line, moving 115 m away in 13.7 s. It then turns abruptly ac;.(ju(/6kbaxvlu 2o xt 8rqgnd gallops halfway back in 4.8 s. Calculate (a) its average speed  (数值)  $m/s$ and (b) its average velocity  (数值)  $m/s$ for the entire trip, using “away from the trainer” as the positive direction.

  A car accelerates frokofrg3.bojfqp)f(9j6ox + aq c7q.g )m $11 \; m/s$ to $25 \; m/s$ in 5.8 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 frombd d*q0hk96hx $20 \; m/s$ to rest in a distance of 55 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a s,wx1;ge-8n j,u; 9 r:ulsk*yurn5t vkx8tk enpeed of $25 \; m/s$ 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 out of the blocks to essentially top speed aboj,an0wkel7;l( )8 txfzy)dx8t od op)ut8l jx;87 w dzk)atleodn0o)pyx,f t)( $10.6 \; m/s$ in the first 12.9 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 unisud3 8e6vzc,vt2rn(bformly from a speed of $18 \; m/s$ to rest in 5.18 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves sk,9ws sk8u5 lfsid marks 92 m long on the highway. Assuming a8 kuss5,wf l9s deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trfhjc-.;bcpim7 sxxk0r rj - /e34rcr/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 ino1+3(y/k qkoz8 jplkx(s0bjn less than 30.0 min. After exactly 27.0 min, there are sti1+okkz/3l8xps o(kq0(yjnjb ll 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?    $s$