Suppose that an object travels from one point in space to another.n:a17x j6ltvq Make a comparison between the displacement anvtjlnqx1 6:a7 d the distance traveled.

  When is the average velocity of an object equal kt;qx(tbv -i ;akmfuukqgi)4v,2w70to the instantaneous velocity?

  A new car manufacturer advertises that their car can y)ry(s/ z9jsggo "from zero to sixty in 8 s". This is a descripti)s /j9s (zyrygon of

  An object moving in t jxd4f);11 m8fbnlzmche +x axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow t0q dx0j:y7b y gg0iq4down as it approachesid g:gq7y0y0j tb0qx4 a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slo;k,hck qsmf;;w5 e,f bw down as it approaches a tram,h;kb5f; fc ;q,k sewffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. hrzhjp 8 )8:tgMake a statement concerning its t) gh8zj8phr: acceleration.

  If the velocity of an object is zero, does it mea (rq.1lhjny7 b9r vwv+ag)gj 8n that the acceleration is zero? Support your ajvbyl7r (vgj9.n1)awg+hq8 rnswer with an example.

  Can an object's velocity change dirlizht 9n 63m9 7tg63ivu7livvection when its acceleration is constant? Supz mv69ll7i3v i36th79tu gvniport your answer with an example.

  Suppose that an object is moving with constant acceleration. Make a czeoi3j eck + ;z8,m) u3f0hcrstatement concerning its motion with respect to tim8c h e 3o,ifm u;zk)3rjecc+0ze.

  Can an object have increasings vlnwzj6u**: speed while its acceleration is decreasing? Support your answer with an ex znj6*v:usl*wample.

  Suppose a can, after an in48mq:tpbxrj c8tygr z+k2+d )itial kick, moves up along a smooth hill of ice. Make a statement concerning its accelerat c2bpx z4y:+tr8qk)t+m 8grjdion.

  Under what condition is average /kj uv e3ki);nvelocity equal to the average of the object's init nv/jkie u3)k;ial and final velocity?

  Objects A and B both start at rest. They both accelerateoxen2oqe /(;f1i z .cm at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A com/qo f c2( m1zinoxe;e.pared to that of object B?

  Objects A and B both start from restmcc f42r 6+osl,px9mwai o u:*. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by objecucr69iamc +*4,oxpm:o2sl fwt A compared to that of object B?

  When an object is released from rest and +42dkp bqx r+ ,djnh5tfalls in the absence of friction, which of the following is true c2t+djp54h rb nd ,k+xqoncerning its motion?

  When an object is released from rest and falls in the absence of friction, nf;j2l l96jbt .*o5 qoktk bj(which of the following ibo tolb5 j(lktj2fkq;*n j69. s true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocity and zdmj,2z b ,95- nesmcethe acceleration when the ball reaches djm-9nmc5 2s,bz e,ezthe highest point.

  Suppose a ball is thrown straight up. What is its accelerno+sxx,l.s,48 ym e yration just before it reaches its highest poie,8y4 m xsny,l osxr.+nt?

  Suppose a ball is thrown straigh0rzih-vz c9vcm6u+t m/1f uk)t up, reaches a maximum height, then falls to its initial height. Make a statement about the di)/zku1rt+v-umv zm96fi chc 0rection of the velocity and acceleration as the ball is going up.

  A ball is thrown straight u;/w dym8m,gg mp, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is cominwym/ g md,gm8;g down.

  Suppose a ball is thrown downward in the absencej; y(udoul,f * of air resistance. Make a statement concerning its accelerj*oy;d uf, (ulation.

  Suppose a skydiver jumps from a high-flying plane. What is her acceldwe0 bu)md 2n8vy dg96sf4z4u9es ;s qeration when shg)bn z2fsu44d6dew9qd e9 0sy s8;vum e she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identic tz5uk lr)4fp;hv) v*cal second ball is thrown uu4;k5)vzfvpc )th* lr pward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. Oy:m-zq/ m:8ahc/t ec gne second later, ball B is dropped from the shqm ycm::t/g-c 8ez a/ame building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One 2 .dy o 64wu-kwkhu*jesecond later, ball B is dropped from the same building. As time progresses, the difference in their spee4-2kkwoweh*d.uy 6uj ds

  Two objects are thrown from the top of a tall building. mb/ah vn32 cve;g)6nx One is thrown up, and th3)hmbc vgvn;2 ne6a x/e other is thrown down, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is tbs mt*7qxd4gkt0( e9c hrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations t04(dtm 7esgbkqxc9 * of the two bricks.

  An object is moving with constant non-zero vetj ( 3ae-+ffs: yw-saelocity in the +x axis. The position versus time graph of this objay- esta+wfj :(s 3ef-ect is

  An object is moving with constant non-zero acceleration in the +x axis. Thmoz lhu7vkh1( b:4 z/u e7h (p:w:vtxte positionov (b1v/zplw: e(hux 7::h4ztku7ht m versus time graph of this object is

  An object is moving with constant non-zero velocity in the +x axiz,*7hgku-ll bj )6b px0e1sbks. The velocity vzx*1,s u-hj ll b 7b0p6)bgkekersus time graph of this object is

  An object is moving with constant nosy g71fiux)8by/mt)x n-zero acceleration in the +x axis. The velocity versus time graph of 8s17g)um )yt/xif by xthis object is

  The slope of a position versus time grapkqj7c(0xlk s)ke ma 0fc+t9-ph gives

  The slope of a velocity versus time grapphs7rz /de2a6j 4t, gih gives

  The area under a curve in an acceleration versus gubyn 5 4qbd*8time graph gives

  The area under a curve in a velocff,2 ndy/e .)h ,goplyity versus time graph gives

  If the position versus time graph of an object is a horizontal line, th45d tbmcc(a)d ,woh/ee object iac)td5cwd o/4h(, b ems

  If the position versus time graph of an object is a vertical line, th 6czp wh-5h)wx 9cug,me object iswu c 6h9-mxz,hg cp5w)

  If the velocity versus time graph of an object is a horitby kgiw85w p.f4n;6 vzontal line, the object is;pt8g4.y 56vwbknfi w

  If the velocity versus time graph of an object is a straight line makin;o .uf1v2cjz zg an angle of 30 degrees with the to2 vzfu.1 zc;jime axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the dieb .6dt)wejco/x (4jl8 7qhbx stance traveled and the magnitud b8 /txe(.4jqbhlwx oc)6d ej7e of the displacement vector.

  A boat can move at 30 km/h in still water. How long w y.jvw- )(dxdwill it take to move 12 km upstream in a river flowing 6.0 km.-yjvdwd )x(w/h?

  55 mi/h is how many m/s? (1 mim nn) (d.h5qq/2cp kdj = 1609 m)

  What must be your average speed in order to travel 350m wl0 pd/7xap; km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57cngbymx69 4*b min. What is the average speedbbc x4 n9*gmy6 of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel 400dxbx h-/sgbb+o*+ au1 km?

  A ly (light year) is the distance that light travels in one year. T (oz 3qjrnyo./he speed of lighro/z on 3y(.jqt 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 kmeacw lk,(5 kkx23 tci+/h along a straight road and you look to the side for 4.0 s, how far do you travel duri2t,(+k kccxikwlea35ng this inattentive period?

  If you run a complete x,z a8*v0dxiqloop around an outdoor track (400 m), in 100 s, your average velocity 08dvxiaqz x,* is

  A polar bear starts at the North Potw cy7m 5rjn9.kk f82gle. It travels 1.0 km south, then 1.0 km east m.cw 2j5gkkrft8y 7n9, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0ts re4 +)7usw(dm/kmk km south, then 1.0 km east, t(/k)der 7+muw ss4km then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 42pwi 2ksuu*xd2y r4emiles. It then starts to snow and you slow to 35 mi/h. eiyd2u2xs* pw4k 2ru4 You arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 kmkp 11 vinp5pm5 c7ie/r at 80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for this tripn/ rkcimp15 p71vpi5e ?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at *sbc/0zzeops 3 +9crk 100 km/h. What is her averarzb cseos cz3/p9k+ 0*ge speed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north i -cyn9 k.4z )ck9gh(gujlqo7 for 750 miles. What is the average speedgz ij kckh49 y() nl9qog-.cu7 for the trip?

  In a 400-m relay race the anchorkz *)h r);,mp8dm5hz wepm5gxman (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 ;5,zkz5x*mrg)mwphhe 8 m)pd 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 st ah, q/hmh9;;kamm(h20e5 tq rmughm,op after 9 s. The car's average velocity during deceleration was 67 km/h. What was the cth eqm,q 2auk;rga0hmm h9mh;/5m,(h ar's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average rate of:xm / /1opaowk px/oaow m:/k1 $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate oev7-j0os u5zkf $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and 7vc)6mv dt5 hay45r mxaccelerates 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 b7vpdkl tj */j2/)kxu s. It then speeds up with a constant acceleration of/7b tdl*xv)2kp /jk ju $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 50n o8mdbgzm8 1.3 m/s experiences a constant acceleration of m0mbz58 8ongd $3.9 \; m/s^2$. What is the cart's displacement during the first 7.7 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed ld 71ulbw3 *7b2xvh mqof 588 m/s strikes a sandbag and penetrates a distance of 41.72 cm. What is the average accb3vm7 27wbu*l lqd1hxeleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrier. It rej u21ub8gg yr* 5cjgc5aches 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 length85ug* g5yu2g 1cr jjcb of the catapult?

  A car starting from rest moveiuqz0y *+ep0gwr1 su 3s 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/s to 80 m/s ,r: vk)3d1 fx cg( rd0:usuiruin a distance of 200 m. What is its average acceleruv rrsudkx, d)ig r30cu:: f(1ation?

  An object starts from rest and undergoes u 1;ofr 2 hfhj3sg()xvpniform acceleration. During the first second it travels 3.8 m. How far wi;g( jffr)ph 1 x2sovh3ll it travel during the third second?

  An object is moving in a straight linl+h+9r pft6jcq: v*w fe with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it mr ft plv9:*6fjh++wcq ove during this time?

  A car starts from rest and accelep b8l s7s4t zsad:0t5nrates 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 aigq m9cwudm;9f k)a.7 t 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 uchm3 cpa +vi-v4 hg18has been waiting at the iac3 cmv+p iuhv1g8 -h4ntersection 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 m/s on tn l9qgi gb)d3jg.j5-ohe surface of planet X where thedn5 )g9obiqlgj3gj. - 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 suude(e :f6lnx;w bm 7ca5vu rk,e) x4w3rface of planet X where thua )xc ew6lbfx5v73reu em,w(k4 n;d :e acceleration 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 hcrzr:j)d) m* a speed of 15 m/s on the surface of planet X where the acceleration due to gravity isj dz:r c)hmr)* $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

  An object is thrown upward with a spe trcb6e s*z 5u(bl/gy8ed of 14 m/s on the surface of planet X where the accelerb c(tzy*b/g65er8slu ation 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 ) * ogz17limcv0.10 s. If your friend holds a ruler between zv*) gc 17loimyour 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 akt(rfb+a;h6m2 x.kp q2)h1 mg s0gvjifter 3.00 f(kh21+jrhqk0 vxi) gm pmts g.a26b;s?

  A bullet shot straight up returns to its starting point in 7 swa4 m7dc j/pc:4x3rwc . What is the initial speed of the bd 3jw7ax4c r/4wc:mpcullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How longf h+,l)c,bg9q jvy ff,0hw ju ;c0py/g does it take tow,+bqg 0jfyhffcg;)9jhcl y,v/0 ,up return to its starting point?

  A ball is thrown downward from the top ol,q )js*p2e*hb3:y6biy gojw f a building with an initial speed of 25 m/s. p l*3oi6,bj*2gbejyws h y :q)It strikes the ground after 3.6 s. How high is the building?

  A ball is thrown straight up with a sq0bg w s0x0kd9peed of 30 m/s. (only fill in numerical value in the9 dwsxgbq 0k00 blanks)
(a.) How long does it take the ball to reach the maximum height?    $s$
(b.) What is the maximum height reached by the ball?    $m$
(c.) What is its speed after 4.2 s?    $m/s$

  A foul ball is hit straight up intoej2lj g/gw32 yun fz r7/if3h7 the air with a speed of 30.7 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 10 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 10.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1isl 4r7 fqd0y5cb.1pp .0 s?

  In Fig. below, what is the velocity he(m6-h xo 61ikf+b hlat t = 2.5 s?

  In Fig. below, what is the velocity axda2devdk8 ox s4af/cs6b 193t t = 4.0 s?

  In Fig. below, what is the velocity at t lp678 u zi6sxrge5mi k21mix1q*cl+v = 5.5 s?

  In Fig. below, what is the average velocn:oos9 q u:9)i(gg p:3hxpaktity from 0 to 4.0 s?

  In Fig. below, what is the average velocity f 1625xngcgxux/ (jni wrom 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 ,:s)undyqt qd066q v6* a vkrjs?

  In Fig. below, what is the accelerationwh5k 5 nkk)jx( at 3.0 s?

  In Fig. below, what is t7pu 3o9g 1zseshe average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 8r473vrxu m5aa/g7j mh .0 s?

  In Fig. below, what is the s6.3e/adox lz8(raoy:vf ag9displacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity?4*df gxtk2o+ x0(v kyaa6 q4 xw+qzm4w {speed|velocity}

  An object can have a varyingtq-0 zh1d7y6zak f) nv speed if its velocity is constant.

  The velocity of an object can be negative whehbmg f5l4yn2c:b+f 7in its acceleration is positive.

  If one object has a greater speed than a second obgnj 0qr6t(x n)ject, the first must have a greater ax n)qjt(0 gr6ncceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling with a r: (joo.6 zipy.gho (xspeed 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 yuzk axyy2437 in speed as its acceleration decreases.

  A baseball player hits ai yonwi-og8sn 49ajt,4 h 1g-c foul ball straight up into the air. It leaves the bat with a s gno,j-wsnh 48o-9g4 iyi1tcapeed of $120 \; km/h$. In the absence of air resistance, how fast will the ball be traveling when the catcher catches it?    $km/h$ (please only fill in numerical value in the blank)

  As a freely falling object speeds up, what is happening to its acceleratio88c6eeztbf-j-ib c /an, how does it i j8ze6bcfba8-/t ce-change if air friction is ignored?

  As a freely falling object speeds up, what is happening to its accelerbaquz .)qa ;1 lwc4e9bation, how does it change if air friction CAN NOT be ba19; aqw. l4qz)ceubignored?

  An object that is thrown vertically upward will return to its orig b-mb74su3 jrainal position with the same speed as it had initially 3rajb4-u7smb if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at z((vpnoh1t6 dxb4 3nithe same time.

  An object can have nonzero veloy udub/s(h.b6t(l9yv 1vtna 6city and zero acceleration at the same time.

  An elevator moving fra izemytmpmk. ; :6(r/om the second floor to the fifth floor making no stops along the way has zero acceleration ma :r e /t;.pi(6mzkmyall the time.

  A rolling ball moves frb4 za.uf zt),-rlk0b bom $x_1=2.6 \mathrm{~cm}$ to $x_2=-7.9 \mathrm{~cm}$ during the time from $t_1=0.9 \mathrm{~s}$ 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 $x_1=2.6 \mathrm{~cm}$ and at $t_2=3.7 \mathrm{~s}$ is at $x_2=7.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete lapkg4)*2kfqdj (uu kz y6s 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 a straight line, moving 96 mc:l q;xv +9nlg*yn*x z away in 8.3 s. It then turns abruptly and g lcz**+n qly9xn xg:;vallops halfway back in 4.7 s. Calculate (a) its average speed  (数值)  $m/s$ and (b) its average velocity  (数值)  $m/s$ for the entire trip, using “away from the trainer” as the positive direction.

  A car accelerates fromi6b1eg l. rsoj04:hjf $10 \; m/s$ to $23 \; m/s$ 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 from o 9 tzrgiv6*s1clcr1k2v2: nj$21 \; m/s$ to rest in a distance of 70 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed of hrqu ) kx)j5c/5kwsdw;ol. h1 $25 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.0 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can : s4kwtdptd/ ro7z( j*burst out of the blocks to essentially top speed abous7jzdwto4pr/d * t:(kt $10.2 \; m/s$ in the first 14.9 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 f:7 auwba cap3:q6y)g lrom a speed of $19 \; m/s$ to rest in 5.06 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car qbp ,wtwu4i.4-u2z7r o rw0lc leaves skid marks 92 m long on the highway. Assuming 44o.qpu-bw trww zi2c,rul70 a deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goingb o q,byf4sk 8t:ri9n: $25 \; m/s$ 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 i (sn39bd h/43wx7;pxyg*igwcdcg zy-, xg;y jn less than 30.0 min. After exactly 27.0 min, there gjx yyg dby34n(zdw/x;, gpsicx-;*h cg39w7are 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?    $s$