Suppose that an object travels from one point in space to another. M.xzhpm,)a pihw 5/hqwx/ym13vf o n6 cb8,t w9ake a compario)mhxh .ixtpc fwyqh/ 6p5w,9aw m/v1n8b3 z,son between the displacement and the distance traveled.

  When is the average velocity of an object equeuvi62;*:5tttf k pzdal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixt9*vy;zona7ib0 : mcyp y in 8 s". This is a desc ;m ipc7oyv*n y9za:b0ription of

  An object moving in the +x axis exxh,e, d97bq.c dj+s gaperiences 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 down -j8f 4 +xrtltxj6j4rn 33cxy1wkr, fvas it approaches a traffic light. Make a statement conc+fx4ynr33v1j,rx ftk w64l xj-jtr 8cerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow d1c tg6 mlk5nu3own as it approaches a traffic light. c kg61t5ml 3unMake a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocse (uf0j*ke.gity. Make a statement concerning its acceler* fg.juese(0 kation.

  If the velocity of an object is zero, does it mean th0;u7 p 9bn7dzgqr 4r q0dokwr4at the acceleration is zero? Support your rdq7;0prbo04kqz79un dw4r g answer with an example.

  Can an object's velocity change m g; hok;dz.)bdirection when its acceleration is constant? Support your answer with an exkz) bg;. d;omhample.

  Suppose that an objec c0vgj5r(ude+go8l )wt is moving with constant acceleration. Make a statement concerning its motion wit(e5jc) dug+vl0 g8o wrh respect to time.

  Can an object have increasing speed whilxs q4 2wghyb30e its acceleration is decreasing? Support2h wy34s xb0qg your answer with an example.

  Suppose a can, after an initipy- txiyx1 ko .),gm+jal kick, moves up along a smooth hill of ice. Make a statement cox ytk1pymi,.j+xo) -gncerning its acceleration.

  Under what condition is average velocity equal to the average0m yn*gy1d-:xx /px ko of the object's initi*yk:m0odp1/yx - nxgx al and final velocity?

  Objects A and B both start at rest. They b2c4)keuun0 v ioth accelerate at the same rate. However, object A accelerates for twice the time as object B. Whnv20cku4e iu) at is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. The/l/ ymwhq:fq/y both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance tra/ w fmq/y/hql:veled by object A compared to that of object B?

  When an object is released from rest and falls in the absence o l.zqtfms;0 e2f friction, which of the following is true concerning its motionz2qt .smfe;0 l?

  When an object is released from rest and falls in the a0/tk:n(pn4 hfzpe- eczjq87 s bsence of friction, which of the following is zte4n7: -es( cpqkfn/ p0h8zjtrue concerning its motion?

  Suppose a ball is thrown straight up. Make a statement lnrbr 5u46fy.about the velocity and the acceleration when the ball reaches the hignu6ry5l.4 rb fhest point.

  Suppose a ball is thrown straight up. What is its 0b0yu .vhos0 k :-j5spmwh4e*k 0gxvxacceleration just before it reaches its highest point? w45vs :gy*-xh uo00x.vk0mh0js ebkp

  Suppose a ball is thrown straight up, reayv mo26- 6 0y/uvzi/f2 isyjavches a maximum height, then falls to its initial height. Make a statement abouyms-62 v//jiuvyvi 0oz y62af t the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, c-z e)jve/h4c,lak8 u 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 z4 e,)/8v- hcl jcakuecoming down.

  Suppose a ball is thrown downward inw+hpi/ b),ie4ie gat rvyvr)du9-69q the absence of air resistance. Make a statement b9)+t4uegh/a6pyqv, i rr)ew i-vd9 iconcerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is hew*dboen,uk3 (x.7 fcdr acceleration whebx dkdwf.c eu3*,no7(n she she reaches terminal velocity?

  A ball is thrown vertically upwah4; +r+gz .bynhpk( 5i6os/socc pd 0yrd with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). Wh/h szp+ yb4gk i6oy c posnc.h0d+r(5;at 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 second later, ball B is ,m/biqu3 m ,tzdropped from the saumt ,/3,z miqbme building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, ball B isk(bgjt 62c a6wz).hg8dto sg-9 wgu2n dropped from the same building. As time progresses, the diffet( wgbtn2)kzscgd. 96o6hjgg8 a -u2w rence in their speeds

  Two objects are thrown from the top93atr+3ljytmp,v im*m ko .4q of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit+4r3omjt,pa i kmlvymt q.9*3 the street?

  A brick is dropped from the top of a building. A second brick is thrown strajkjz* :aewv6aq nd -19u io9m-ight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two-wnuo1dz:m6jki-*qj v a9e 9 a bricks.

  An object is moving with constant non-zero velocity in the +x axis.e m z1ijcqo7.p6 8m-np The position versus tij.7-e c 86mm 1pqpiznome graph of this object is

  An object is moving with constant non-zero accelerati0 q3)m -nil)ocssism 2on in the +x axis. The position versus time graph of this omsqn-csi)l3 m 2i s)0object is

  An object is moving with constant non-zero9msch ds (b,i+(x (dso velocity in the +x axis. The velocity versus time graph of oisd(bh+s s ((9d,xcm this object is

  An object is moving with 6iwcuqe r.l1 m,sjvn;ky:j gs(2/ hv0 constant non-zero acceleration in the +x axis. The velocq:eu yj(ic01lm.s2 hkr,v vjn;s w/6gity versus time graph of this object is

  The slope of a position versus timbbc9g mmf;ed i9t.z(:e graph gives

  The slope of a velocity versue-wlkj6,+ gu6rmbne q) -st;js time graph gives

  The area under a curvl e./ mtj +qzn:q2qmh7e in an acceleration versus time graph gives

  The area under a curve in anrqdjti/x78*2 a;vu s zn:.yq velocity versus time graph gives

  If the position versus time graph of zobre; o,amp1ve q(iy/b14 p3an object is a horizontal line, the object is1ipbor mqvyobez4e/1p ;3a(,

  If the position versus time graph of an object i2z f;pu)yhq2av ors)0s a vertical line, the object isy);rpzvh 2 ou)2qf sa0

  If the velocity versus v37t tx+ * yh;eqc p/;mtet dw8l0gop.time graph of an object is a horizontal line, the object i ;*pt; e xt.w/ye0lv+7tcqto3mphdg8s

  If the velocity versus time graph of an/s fp6vf vd v223ij)yh object is a straight line making an angle of 30 degreedv2fy h3isjvf)2p6v/ s with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distancpe6wpnq. r2j-ilts;xe i 5 c91e travelrc; iew -x pet6pnqli j5s19.2ed and the magnitude of the displacement vector.

  A boat can move at 30 km/h / fv39 49ljvgn xuslc8t/w w9pin still water. How long will it take to move 12 km upstream in a river flowins/p x/gt vfvjn4uc9 9wll 93w8g 6.0 km/h?

  55 mi/h is how many m/s? (1l;jrfty2 owl5 9 1pl4g2*(pi to5ygkr mi = 1609 m)

  What must be your averawa fcq/7s+7 zpvv*z r;ge speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (ad.gifp h;dv2+,lft 9 zziu3f.5 gag m0pproximately 42.0 km) in 2 hours and 57 min. What is the average; gtd3zvgmfazgiu9+.f5hfl i d.,20 p speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel qhg (1pngt9a0)95xsgg0ms3 s*upy: wn asz/k400 km?

  A ly (light year) is the distance that light travels in one yi7xco ,m za0j0)evqoc1, +fnr ear. The speed of light is en7 0co, x1o,zvjqa0c)i+f m r$3.00 \times 10^8 \; m/s$. 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 strq8h ,zddmh)rp1 /ycxv j +wn85aight road and you look to the side for 4.0 s, how far do yo /+jnq)zvhd1m cx,h8d5p r8y wu travel during this inattentive period?

  If you run a complete loop arkod,6(la8dgbe6f d:wound an outdoor track (400 m), in 100 s, your average velocid6d,dkg:oa 86e w b(flty is

  A polar bear starts at the North Pole. It tr zubj2:tc6 x3 m2: hsliiou.h/avels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its startinj2cxu ih2 3o :ubzi6sml:t. h/g 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 km1sz*t,+isll u fx7r1f east, then 1.0 km north, then 1.0 km west to return to its starting point. Thi*1issfu+fllt ,71zr xs trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school atoqwe j4e6m/j8 7wusowht7r 71 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You ar1 uot648werw7w/ oehmj7sqj7 rive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What + au/0w/-hjrao eo 6k*a+glvlis the average speed aahw6ukgj /allo */o++rv- e0of the motorist for this trip?

  A motorist travels for1m1t; .byii ug 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her averagb; utyim.i 11ge speed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north for j9fhfuzv /x*m-sf0-c 750 miles. What is the average speed for the tr f z-cx9mf0f/s-j*u vhip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m7pwq.4 lm:kgi ) 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 race, in order that the team:.4 iqwpk 7lgm A runner not lose the race?

  A car decelerates uniformly and comes to a st+c:.hw/x+ucb rmnn93 hyd cw8 op after 13 s. The car's average velocity during deceleration was 49 km/h. What was the car's deceleration while slow.b hchw/nw9ry+3 n:c cd8m+uxing down?

  An airplane increases its speed from 100 m/s 1ji6z e ktd4k7to 160 m/s, at the average rate of kj6t 74keidz1 $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at jjjeru/c*j;n1t+a :cthe 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 nufi09tgk+n 4o6y.q o5 zq x+faccelerates 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 wiz.fty,i:m0 -n 6h9i;n . ktxz luvdp-gth a constant acceleration of v6. f9-;x .uh0 nd:i m,intky-tpzzgl$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 3.2 m/s experiences a constant accelerat uy4j. zt;tvg9ion o4.t vg9zju t;yf $2.9 \; m/s^2$. What is the cart's displacement during the first 6.2 s of its motion?

  A bullet moving horizontally to the right (+x directwz, hn/zzyk, zw2e12 rion) with a speed of 219 m/s strikes a sandbag and penetrates a distance ofzy /z,k2 wezwnh r1,z2 87.47 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraftb08e j 6tm1)kdct)xz nbd/8 /bst wo9x carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requir9 n eo/)z/1jx8t0kbb8twsbdtdx) c 6m es 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant acceleration (xi2mvlhhvwj;hgpl -, + i t+5of $2.0 \; m/s^2$ 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 aver(yudfn6e .4 3hk*1aasze g+vtdr8 j -hage accelerasf ekdh3*. a+14 uh(anejt8 gyrz- d6vtion?

  An object starts from r(ga-i,k hq e:qest and undergoes uniform acceleration. During the first second it trak:he- iq,(a gqvels 4.5 m. How far will it travel during the third second?

  An object is moving in a straight lyo;n1c3dd6g6m1j e 0mpg p(zline with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 (egpm1616 3zy o;d lmgpjcdn0 m/s. How far does it move during this time?

  A car starts from rest and accel1g8 -bw0 /r/knxhrtzfh:a9 2hiw.ta jerates 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 decelerhdd*.k p0+yf cate 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 trafficngj yp65 (g v3c0 iirprm9p5- yff+4ul light turns green, a car that has been waiting at the intersection starts ahead with a consi4yv5fj p 6pgf5r9(0nlmpi+r ygcu- 3tant 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/u-pair 5z*oe 12 m/s on the surface of planet X where thei5z-*/pr e aou acceleration due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward hiy yjc/0*z5tsj 7hn+*e x4uu with a speed of 12 m/s on the surface of planet X where the accelerez 4t h*+usj*i cu/j50ynyh7xation 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 plan8 zldkj51n ;zfet X where the accezd8k n f;1z5ljleration 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 of pl omj9u/xv4h7tanet X where the acceleration due to vj47um9xh 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 thanw*wc1onrt oe1i en1t6+3ljg 9 0.10 s. If your friend holds a ruler between your 9 t11rotwo1nj6el3 *i+gcnw e 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/sibs 5nznu9 :+f. What is its velocity after 3.0:n uzfins+9b 50 s?

  A bullet shot straight up returns to its starting point in 14 s. m/j noxv,o9*kWhat is the initial speed of the bull/,on9mxj *vok et?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it tadh ;9/1j wy//u9bdvmu. jjpxwke to yp/ .m j h/9 buxwj9uwvd1d/j;return to its starting point?

  A ball is thrown downward from the top of a building w.x)2 fyjqj9uqy4*hndg ha2 ,cith an initial speed of 20 m/qch2uh a q)y,xy9j*nfjd g42.s. It strikes the ground after 5.1 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in num1yy:itz;7uxoyue fc6 0n ji)x2i/ 3 zwerical value in the blanksi7n:o; 3 e2y ziyyz/01c iw6uxjt )fxu)
(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 spee,,xie9sb8j0l:g 8u ic sh-z ovd of 24.5 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 3 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 t r +zo28yaf)w0 ujchb)he velocity at t = 1.0 s?

  In Fig. below, what is the veloc4mwjs ( vgqi3 /,sjku:ity at t = 2.5 s?

  In Fig. below, what is the velocity at+ alj-w .dr5wxff0m 2d t = 4.0 s?

  In Fig. below, what is the velocitpima )w9oj:dr(-5kj:o4 tab b y at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.0 1 y19jl kdold/bzer:*s?

  In Fig. below, what is the average veloci9 r9v 0yt;ah,oyn4ctz ty from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.1w a/ bd;lin*t0 s?

  In Fig. below, what is the acceleration at 3.0 shiv;/prip r-+x. :r - in4xkts?

  In Fig. below, what is the average acceleration from nbf w02wxr8)da ;fp)ic ;a1 xg0 to 5.0 s?

  In Fig. below, what is the average acceleration f a4e,7ev,o go--o m+pcpl gjx5rom 0 to 8.0 s?

  In Fig. below, what isxw;ek+; wzkg:gf +iia,u + ,sg the displacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|velocio.(;x*oew7h5 9hb b-xwh efugty}

  An object can have a varying speed if its velocity is)copf :xkso 46kh:,tk constant.

  The velocity of an object can be new/b( uxznf, 2h ut6-aqmp3be9 gative when its acceleration is positive.

  If one object has a greater speed than a second object, the first mus3btl,7f:rj zdt have a greater :7 b,rztfl dj3acceleration.

  Two cars emerge side by side from a tunnel. Car A lm iye)*-aff 1is 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 increasing in speed as its acceleration decre l)rjs2((abf dases.

  A baseball player hits a foul ball straight up into the air.g 9cte;uj0+ hj It leaves the bat with+jgh e0ju9;ct a speed of $120 \; km/h$. In the absence of air resistance, how fast will the ball be traveling when the catcher catches it?    $km/h$ (please only fill in numerical value in the blank)

  As a freely falling object speeds up, whm xak 3hi*ciheh1ev1o+6y 3-oat is happening to its acceleration, how does it change if air fr33ceom-ah11vk6 h xei*yi+ ho iction is ignored?

  As a freely falling object speeds up, what pw o0 -ribv-+vsp/4ceqb(i /wnl:a7r is happening to its acceleration, how does it change if air frictisw/a7 nv0 cbb-e(r io-:pwq/ 4+rpil von CAN NOT be ignored?

  An object that is thrown vertically upw 0zdn)f/ih o3gard 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 resulhf0z i3)o/dngt be altered?

  An object can have zero velocity and zgq sjujd;6q9+u6 b p 3ewtk65nonzero acceleration at the same time.

  An object can have nonzero veus3g,elfel86 locity and zero acceleration at the same time.

  An elevator moving fr) sn1vbksg0u f)y*j.rom the second floor to the fifth floor making no stops along tjf)b. gnsky*)v r1s0u he way has zero acceleration all the time.

  A rolling ball moves f-93bwuad9 wairom $x_1=1.8 \mathrm{~cm}$ to $x_2=-7.6 \mathrm{~cm}$ during the time from $t_1=2.2 \mathrm{~s}$ 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 $t_1=-2.5 \mathrm{~s}$ is at $x_1=2.5 \mathrm{~cm}$ and at $t_2=3.3 \mathrm{~s}$ is at $x_2=8.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight cfvo j k729.d1)udcjb complete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.5 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trjw 3 awh*ga-2vainer in a straight line, moving 88 m away in 11.5 s. It then turns abruptly and gallops halfway back in 4 wj 3*avwg2-ah.5 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 fromj- k+swt9rf 4e $12 \; m/s$ to $24 \; m/s$ in 4.0 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 gva 81s37 abmz$17 \; m/s$ to rest in a distance of 72 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a ao akkb 5 9w+y lo,,hq)nqhp5,speed of $28 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.4 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinterp, 2/xtqxp,93kbzzn-d.tg.g m x p7h i can burst out of the blocks to essentially top speed abou ,q3x xd7hgtpzp./zpm-gk ,tni2xb9. t $11.3 \; m/s$ in the first 11.4 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 a speed ofza ii,/dm11ze $17 \; m/s$ to rest in 4.73 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 )yko 8 7)sszr/boy*p gthe highway. Assuming a decz)8pkr*ob s o) 7gs/yyeleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck g1uvs:ttpevc atk ;sth5db0p1 e5k; d; mh,02doing $25 \; m/s$ 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 rlqa (7et*9pv azp.) 5uggu:kle 6c 8kof-q1 afun in less than 30.0 min. After exactly 27.0 min, there are stillfgt( 8 zlao7 u).9v:6agq upfk-5l1 kpece*aq 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?    $s$