Suppose that an object msmc4ofk -fa3qe2f(, 0khc3ztravels from one point in space to another. Make a comparison betwc k(hoc 3me- ff,s4a3z2fk mq0een the displacement and the distance traveled.

  When is the average velocit o+jhn mm7oouy/;b6/zjq6 jrqn12jl-g -f a9e y of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty in2u 6:ke0ef xto /j+wbqn0m wn8 8 s". Thue/ nfq2xk + bjte0n:o6w8mw0is is a description of

  An object moving in the +v1ly mzj(0f 2nx axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x tas;hpn-7 7g sdirection) begins to slow down as it approaches a traffic light. Make a statement concerna7;nphg7 t s-sing its acceleration.

  Suppose that a car travk6igjas5f- z 1t * )3.gmtseq e;s(siaeling to the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleratis jete. -aak6() s s;mq5fz*gt3sgi1ion.

  Suppose that an object is moving with ak. 7-x(; g+fbf) aoyih8mpyzn constant velocity. Make a statement concerning its accelefy.z8 gomyk(+-x7bn ); f piharation.

  If the velocity of an object is zero, does it mean that the acceleratiodp/a k 4e-nps+w hq,5;h8kq )bm;ks stn is zero? Support your answer with a ds- 5;ns q/,)hpqstakeb+4kpwk8; mh n example.

  Can an object's velocity chu3 r7pv;idel3f 9r vh.uil ,76n8lto qange direction when its acceleration is constant? Support your anevqv o783l9ln ;6h p irt,7i.u3 rfudlswer with an example.

  Suppose that an object is moving with constant acceleration. Max7l pbac2v1l )k ;ufe29sp)1zzdp-p wke a statement concerning its motion with respect to t)f2p19dez slpxvpzw; 2k ba 7ul-) c1pime.

  Can an object have increasing speed while its acceleration is decreasing? Sufsrmto n1q.o(d4s i)0qj nmj.b)cw: 0pport your answer with an exampo. q 1.qcijn:n w )jdrtbo fsm(sm040)le.

  Suppose a can, after an initial ki3sy sr2pizcxn+p x55ipvzw e0b+)+z8;zw 4m nck, moves up along a smooth hill of ice. Make a statement concerning its ap8yizx4p 53neib2mw zc;zs 0wz 5+nr+)+p xv scceleration.

  Under what condition is averagvb/x7g0sq/-ha*z:i /ewk3 my ux pk;fe velocity equal to the average of the object's initial and final veloxh gm : wv xk u-y//0qisa*kpb/z3;ef7city?

  Objects A and B both u9.jvpvr7uujxp4a+p x6 f5*a start at 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 objeruaf j9 .paxu6pv*7ux 5vj4p+ct B?

  Objects A and B both start from rest. They both accelerate at the same rate. t)jg5jz69miwz- b9 rg However, object A accelerates for twice the time as object B. What is the distance traveled by object gtmz)gw6jz9ji 9 rb-5A compared to that of object B?

  When an object is released96gkh/y.k4xb4xwl d tm6u4 ix from rest and falls in the absence of friction, which of the following is true concerning itskbm4/t.6k94 yuxgi4lwd 6 xhx motion?

  When an object is released from rest and falls in the absence of friction, whicslp;pim5i r7(m c jp0 v2*bun*h of the following ii*u2 m5i;mpn (js lbcppv7*0r s true concerning its motion?

  Suppose a ball is thrown straight up. ufh3tn t9jllqd5 b0)5 Make a statement about the velocity and th5nb )fut3 5 thld0lq9je acceleration when the ball reaches the highest point.

  Suppose a ball is thrown s4j7wvkdr v5 n/traight up. What is its acceleration just before it reaches its highe r47wv/kndj v5st point?

  Suppose a ball is thrown straight up, re3 3n2aw38(48x. qedzdkp/abe t pz pydaches a maximum height, then falls to its initial height. Make a statement about the directqean3p/2t 3xwa .d8 zp8bzp d4de k3y(ion of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reachehovuyf i-1:2y s a maximum height, then falls to its initial height. Make a statement about the direct 2v1iuf:-hy yoion of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the abse44n (3evrrh0igq /x z4nr(hws:ef;lw nce of air resistance. Make a statement concerning its acrlreg(nqih 3sz4:wwh /;rn (0fe 44xvceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her accelera3v/o-ii(tay7o h.b qbtion when she she reaches terminalyi(-o/.o bbviq 3ha 7t velocity?

  A ball is thrown vertically upward with a speed v. An identical second gp6)a2t0m+ jjwn)8y4+o 6*gc f-leuysmc fqa ball is thrown upward with a speed 2v (twice as fast). What is the raticy 6a*f+ me)wu46-0 lf+jtms ng py2ocq8gaj )o 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 second laterr ds4 ml/(f7y c9c9/ dgxehv-i, ball B is dropped from the same building. As time pes4 v-c9d/xrl(h7 yfd/gcm 9 irogresses, the distance between them

  Ball A is dropped from the 7rphjq s*my,t u ji,5zw1qs+3top of a building. One second later, ball B is dropped from the same building. As time progresses, the difference in their m1 ,qpuj+rz7,qhiy*ts3j5 ws speeds

  Two objects are thrown from the top of a tall buildinscdw;y mnqu 0 +5 jz6qle:k6r,9( azqcg. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds whed(5c6:q lm90s reza,u 6yqcqzj ; k+wnn they hit the street?

  A brick is dropped from the top of a building. A second brick is thrown strafxt7l. z14xa yight down from the same building. They are released at the ytf a .17zl4xxsame time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constvgs4; i( o*nhkant non-zero velocity in the +x axis. The position versus;k gv( os4n*ih time graph of this object is

  An object is moving with constant non-zor 2zkb/ tt1w*p1* wlgero acceleration in the +x axis. The positionwbpztt w /1rg o2**1kl versus time graph of this object is

  An object is moving with constant non-zero velocity in the +x axis. The velok* tuol *wxnp5 x/(+jkcity versu+xu*t(jxnpw5*kk o /ls time graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. Tm:mk f .fohgemz) 4e9o2p8eg0he velocity versus time g:e0g.k fo)m9h 2e 8opzgm 4efmraph of this object is

  The slope of a position versuh;c m wzb.ae4d t*w*r.s time graph gives

  The slope of a velocity versus time gr (se5m4zm 8 4ahf2xxsdaph gives

  The area under a curve in an acceleration versus time graphy4 4 vvba0uhn,i/+po8wa+gv i gives

  The area under a curve in a velocity versuswmz( a2p6qv g5,t1oowl*mt3y nmjj15 k/ /lad time graph gives

  If the position versus time graph of an object is a horizontm1w 9 jib:r,89sx vezhal line, the object 1b:v 9xm98 hws jier,zis

  If the position versus time graph of an object is9;n/ 2tg 0 nsb62frtnzfk1eke a vertical line, the object isg0fe;zbtr kn 9f1 6n2/nteks2

  If the velocity versus time gr/6mt itws c):xaph of an object is a horizontal line, the object ismw6t:c ti)/xs

  If the velocity versus time graph of an object is a straight line makro-/tgzk gbm ef6oy )6:8 quj:ing an angle of 30 deg t 8emjyoz66g:buo) f/k-r g:qrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. wht /5gwihp(2 Find both the distance traveled and th5p tg/w2h(wihe magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How p vf6 c6n68(hnn kjbd-long will it take to move 12 km upstream in a river flowing 6.0 k86(n c kvd6 6-jbfnhnpm/h?

  55 mi/h is how many m/s? (-(a v:lf tty xf:i5)pu1 mi = 1609 m)

  What must be your average speed in kxj,)nov6fx8order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hows a rben py joq18,9dvkh-*,9urs and 57 min. What is the average speed of the runner -,,hy*1p kqd e jso98a9vbrwn in m/s?

  A car travels 90 km/h. How long does it take for, b- 0g s a0+svmvaht,yvhnl1- it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. The spee wy02fwl psq+,/6fiw ad of ligh/wfy2q+f 6a,0 s wwplit 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 b/tjww- d js..road and you look to the side for 4.0 s, hojw/ bdswt- ..jw far do you travel during this inattentive period?

  If you run a complete loopv+ frng o(fe-. around an outdoor track (400 m), in 100 s, your average veloc+fv.ref ong( -ity is

  A polar bear starts at the North Pole. It travels 1.0 km sout39z b0dfs raxn/3phzul0,kk/h, then 1.0 km east, tufbr/n/h 0d s0zlk,3 9kapxz3hen 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 speed?

  A polar bear starts at the North Pole. It travels 1.0 km southy.qw tnk2h 88ulxlh7* , then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip twulky.t2 xh 7*nhq88l akes 45 min. What was the bear's average velocity?

  You are driving home on a wemjr ldw )so3imp)w 5(6ekend 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 yo ()ompr6j3w)ismd l 5wur hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is the a*msee nh7;1veverage speed of the motorist for 1e mn7;eehs* vthis trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at d st sf;e;kp8q wd;.1bqmec 3*100 km/h. What is her averageq*3dm 8 ;;. 1ssc ;tbepkdwefq speed for the trip?

  An airplane travels at 300 mi/h soaoko o:/qvp ; )ky*pq.uth for 2.00 h and then at 250 mi/h north for 750 milesao p/o.p* qvk;ko:q) y. What is the average speed for the trip?

  In a 400-m relay race the ancrev 3uw8h; /zun tz(4vhorman (the person 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 m 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 ra hr(e34 un ut;zz/wvv8ce, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes wj b 3tn,47r7u;jm yldto a stop after 14 s. The car's average velocity during deceleration was 36 km/h. What was the car's deceleration7, l jbytj w3;4n7dmur while slowing down?

  An airplane increases its speed from 100 m/s to 12+ rc0kahqxj-z07x0se e n po660 m/s, at the average rate of kq62socez+p00nxa0re h 7jx-$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acceleratsp7 i)) eh oon:0l9pnees 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 accel,q, 2xc7izzl 5coqjx;wz.y 4z erates 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 speeds up with a constant (2o ijemwc0oa. uk+m 1ayy 1zg36a 9jvacceleration of aevawm ijo(9cz+ 6j myo21 gkya3.u01$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial vewmo4; 7ikl grhl* o,dar,k(p0locity of 5.3 m/s experiences a constant acceleration of(o*7 ,04w kahkpr l,rgmid;ol $2.9 \; m/s^2$. What is the cart's displacement during the first 9.3 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a spea uq fdwkhp h,tl2.nn7b3k2;q3 )*ngved of 434 m/s strikes a sandbag and penetrates a distance of 80.64 cm. What is the average 3u wq.2a2k;bdg ,nvqn)n73lth hf*p kacceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched fro ob0l+jyn).k8.imab.uv hhrk/ -)syg m a catapult on an aircraft carrier. It reaches a yn)-08) hry vks.ijk+ hl o./.gmabbuspeed 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 catapult?

  A car starting from rest moves with constant accelia q7ohnh8xtv,5y 3n( eration 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 rk 4wu(+jwfvo/y 0 a5laverage acceleratv(wkuf4/alrwoj50+y ion?

  An object starts from rest and undergoes u4hj(5sr5 *w;q syl orrniform acceleration. During the first second it travels 5.7 m. How fjh*syqs;rr5o rl4w5(ar will it travel during the third second?

  An object is moving in a straight line with constant accel-yhzvfi*trcy 3d sad1k6fha;-u ; ax5 ag+k).eration. Initially it is traveling at 1 sz6a k5d+x t yrh)kia a.; u*-fhgcya1f;3-dv6 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 u+d 3*svf9qz7 bta5 jmig:vo 0jniformly 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 ab5i,i // /bcwwr+ hffjhout $5.0 \; m/s^2$ 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 at the imbddq/a - b5d7y8t,mg ngm5/by8,tb q- a md7ddtersection starts 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 of 12 mxufl;a3eo*ao qe u84 (/s on the surface of planet X where alu(o ea4fquo 3;x8*ethe 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 surface of planev g ugzu1.s9;ot X where the acceleration due to gravu 1u .o9sgg;zvity is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown up0kx6ifyi i13d( 11 o9fxmkj ykward with a speed of 15 m/s on the surface of planet X where ij1kdyx1fxyi k36i k(1m9fo0 the acceleration 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 14 m/s on the surface ay.u /u 84f4f5xoi ,l3zgurkxof planet X where the accelerf4zio3u a/u8g f lr5y xu4,.kxation due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usua: kqu d8 21j-yl+s,uamgo3le7cwl qe, lly greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can8, q7-: d+cukolml sjl2eu3e yw1ag,q 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 ujy8t-y sf-z1 2u6 b2;myassdits velocity after 3.00 2ss yf; 1u-ujtzamsby-68y2d s?

  A bullet shot straight up returns to its starting poinn 9c- 9ab ap.:d atv*7f,wy.n rsck.adt in 17 s. What is the initial st-ca9krpa wcf.sna,*a 7: nd.dy9.bvpeed of the bullet?

  A ball is thrown straight up with a speed of 36.06ah q ro8kxj3 -v91pp tzcyc+) m/s. How long does it take to acrx)- 9z3ok8v +jp16yh p tqcreturn to its starting point?

  A ball is thrown downward from the to s oe7u /p*hjji;t8.ssc, (soip of a building with an initial speed of 30 m/s. It strikes the ground after 4.7 s. How high is the buildioi ( ;. ic/shsutoe,sjp*sj 87ng?

  A ball is thrown straight up with a speed of 30 m/s. (only fill hv 0 n6sq4wmb.ji)9ki,hfmog;f2k a 2in numerical value in thebf4jmiw6i asqv,gk.0k n2h2;hfom) 9 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 )s2 h jok)x.vh :si7elf:h0u qup into the air with a speed of 21.0 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 2 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 is the velocity at t,w - ioy-)hf/(ky r(oh5etnwg = 1.0 s?

  In Fig. below, what is tc150ee k)l luj1fq;sqd mb8(g he velocity at t = 2.5 s?

  In Fig. below, what is the ve(m.*wcu 6ht d e*2xiofq :u0dslocity at t = 4.0 s?

  In Fig. below, what is the velo ,ou8c +,ggy878rcok bgxcrtpf4yl )1city at t = 5.5 s?

  In Fig. below, what is the average ve(3-b6clg p rnuysb9)mlocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6.+erl huc.)ao70 s?

  In Fig. below, what is thxkx xl 69 vnu-2fx ptofq44:d(e acceleration at 1.0 s?

  In Fig. below, what is the accev8s( g*+w/ je ljs7taxlmj p4/leration at 3.0 s?

  In Fig. below, what is the average accelerati*mzmq oo u+h3-on from 0 to 5.0 s?

  In Fig. below, what is the average 7sa9yrq /k2- +yhwrso/ bn8zf acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement q 5 8)k,q5g0)oyduxvytxz9lv from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {spe2tkh;4yf mw v3u5cvfd .6b-op1phk e9ed|velocity}

  An object can have a varying speed if its velocity is constww-(6 jhu(tz 7vnwvt+ant.

  The velocity of an object can be negative when itsm7var:ialzs5 w (8 o.b acceleration is positive.

  If one object has a gr/-rihu dpo m00eater speed than a second object, the first must have a gremohd/ir 00- upater acceleration.

  Two cars emerge side by side from a tunnel. Car A is trave t,ih:hkq;o v,48k3sd8cf doeling 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 increasin7o y nt)c2sl0hg in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves ,s1um;nzz 7myaem z7 py- 4fp1the bat with afs7;ap 11nzmyy- zp,74 mzume 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 uf6hdpk:.ao zz d9y;b :p, what is happening to its acceleration, how does it change if air fric; ph.: fab dky6dzo9:ztion is ignored?

  As a freely falling object speeds up, what is happening to its acceleratinpdgm*qr: xdzx925ch7 i-8ofbg69ah on, how does it chang 92 -addmnfp*hhb: i85rxoc 6q7gzg9xe if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will saew,t u/r2(ebk.oyx)ksd69return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciae9)kkwb asx,u./t2 ydsreo 6( ble, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at the same tim/7q y7-h sit )0d*hayn5kkpnze.

  An object can have nonzero velocity and zero acceleratiskbq)j3 r6v zp8dh4bvr9c + y,on at the same time.

  An elevator moving fromtzc mi: 2wb 99v(yz0wu the second floor to the fifth floor making no stops along the way has zero acceleration all the timet:by0 uczv wz9mi9w2(.

  A rolling ball moves, rg+m uz4*-r0fiwt+rrk7asa from $x_1=2.0 \mathrm{~cm}$ to $x_2=-6.7 \mathrm{~cm}$ during the time from $t_1=2.0 \mathrm{~s}$ to $t_2=5.2 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.2 \mathrm{~s}$ is at $x_1=2.4 \mathrm{~cm}$ and at $t_2=3.4 \mathrm{~s}$ is at $x_2=7.6 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight completl+l hh2v8 zb)zwg11v*j bti 5ee laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 12.1 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 ayb. *nfj wz*;3s(uu wggo-lq 0 straight line, moving 104 m away in 9.2 s. It then turns abruptly and gallops halfway back in 4.6 s. Calculate (a) its avz*wouylg-w (3f.0u ;sbjg nq*erage 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 ub qp-h,(w ni cv50*fj 6gbt*l$10 \; m/s$ to $22 \; m/s$ in 5.7 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 from oi g,c1hdm qe*.b1m:n$21 \; m/s$ to rest in a distance of 71 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must re1 pk ,)routns*ach a speed of $32 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.2 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter cub4ea+ wr *uk9an burst out of the blocks to essentially top speed aboua euk+*9 bwr4ut $10.3 \; m/s$ in the first 13.8 m of the race. What is the average acceleration of this sprinter?  (数值)  $m/s^2$ and how long does it take her to reach that speed?  (数值)  $s$

  A car slows down uniformly from ampy*xgps5k;6 r9eo zh f0 fs39 speed of $20 \; m/s$ to rest in 5.23 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m long on the hignbs ,s6:y+jb uhway. Assuming a deceleratioybsb +j:n s6,un of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck go3h p3xc9:sjs wga4k-fxkk29wing $25 \; m/s$ 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 th7)hz)fyphz p7 9f:yc xe 10,000-m run in less than 30.0 min. After exactly 27.0 min, there are still 19)y c: 7hxz7zfyhp)pf100 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?    $s$