Suppose that an object travels from one point in space to another. Make a compf9 khx.6,(,mmcky:( lpr sk pgaripmkx gk:l96s(.hk,c mrp (fy, son between the displacement and the distance traveled.

  When is the average velocity of zh5bb hb y12sfkpo.,bl*) :2 ub/gtm tan object equal to the instantaneous velocity?

  A new car manufacturer advertises that theiyxr0kwy: 8+bcr car can go "from zero to sixty in 8 s". Thc:0ywb+k r8x yis is a description of

  An object moving in the +x axis experiences an accelerafnh;m3bz*u 4x(sq,o6g dw0mo f5sjk +tion of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) bepe s z1d0 yz+j-to5pwdk,w 32wgins to slow down as it approac2ddj y,0ww5kswot+3z- p zpe1hes a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow down aszactyherx8.a bo z0 (5n f642j it approaches a traec(aa o80j 2rtx56y4f.zn bhzffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Mc bij9rhs. n84ake a statement concerning its acceleratis8r .ih jc94bnon.

  If the velocity of an 2 *wvgr f,tq:z9n.uusobject is zero, does it mean that the acceleration is zero? Support y zq2t,s*gvw :un.f 9ruour answer with an example.

  Can an object's velocity change direction when its h shal8*e;.*tjv.mi oacceleration is constant? Support your answer wi sjh .heta oi**;.8lvmth an example.

  Suppose that an object is moving with conux0ha:6 (o jcsstant acceleration. Make a statement concerning its motion with respect t6 xhs(aucj0o:o time.

  Can an object have increasing speed while 5y(x irb6hm .3h8zoja8jod d2*ttx( g( ,drqk its acceleration is decreasing? Support your answer with doq rz8x(hm( hxjy3bdkg*ji.r2a, ( tt od865an example.

  Suppose a can, after an initial kick, moves up along a s g6di+mz iej yvn*-6tcv18w 6amooth hill of ice. Make a statement con-8ad 1mctyg*e6v6j nii 6 +vwzcerning its acceleration.

  Under what condition is average velocity equal to the average of z)*:)dfxov :*u;cw ;um4tn:bvymfxl the object's initial and v;u ;tfwx:u) vd4bnzlc:mof: )ymx**final velocity?

  Objects A and B both irj6 1bae9n*-v e a wc0cl:bmql, 4z6ustart 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 em0ew*19a-ub,6:c4 iacj zbqrv l6l nthat of object B?

  Objects A and B both startzbc( 1 fn6rqj me3r *e62a0pse from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as objecr03ene 1fs( a6be6zjq2r*pm ct B. What is the distance traveled by object A compared to that of object B?

  When an object is released from rest an,eesurhc1yy + /*7 pmhd falls in the absence of friction, which of the following is true concerning its muhe7m +,s1ry* hpe/yc otion?

  When an object is released from rest and falls in the absence of fri4(nj7h p 3z:cs/eudm pction, which of the following is true cn7m 3:pc4uzj/pe (hd soncerning its motion?

  Suppose a ball is thrown stratf)q7 7etnmv(ight up. Make a statement about the velocity and thnt7fq v( )e7mte acceleration when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration jc*cfd j//7/wnw9pm rzust before it reachew9mnp*c// fzdc/jr w 7s its highest point?

  Suppose a ball is thrown straight up, reaches a maximum hei fta/)d1:3 q wklw+ u)pjruqt9ght, then falls to its in f 3)j /lwa+kq9wdtr:tquu )p1itial height. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reac42 7qc1v tlrpjhes a maximum height, then falls to its initial height. Make a statement about the direction of the 1v2 cj4qrl7tpvelocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absenii ycd2bw2cwqn;yet j)28: t7 ce of air resistance. Make a statement conwiw 7e2 2i ccj:;td)2ybyt8 nqcerning its acceleration.

  Suppose a skydiver jumd,m-0dwopibv z m, /x7ps from a high-flying plane. What is her acceleration when she sh ,0zvw,x-bdm7 ipm/doe reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical secotku6h ( 92duheyz0 a-fnd ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height uh0 fuhkte9 dy(z2 6-aof 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 bz).c g38urir (e85yx ff+v8)thxd w kduilding. One second later, ball B is dropped from the same building. As time progressf dzc58ux8e)r8 ).ig(dwhr ykt3v fx+es, the distance between them

  Ball A is dropped from the top of a ps p,2g. iye9wu(,k4pa kveg -(ua bx1building. One second later, ball B is dropped from the same building. As ti .bwau1e-i,e 4u9skyv pk(axp(2,ggpme progresses, the difference in their speeds

  Two objects are thrown f sg-p;dz7o8 9/ddt+gt zms hra6c8x;rrom the top of a tall building. One is thrown up, and the other is thrown down, both with the same init9 tcrdamz8g-; hsx/dz;os p7t +r6 dg8ial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a bui0cwn65vu 0u w vsimof88yf8tjp;j0q ; lding. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistanceww8y00n5vq6 ;;cf8 t8om pij0vuu fsj . Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axih// 5x (zsufdys. The position versus timedz//fsx(yuh5 graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis njue)9zj6+jh. The position versus time grae96j+jn z)h juph of this object is

  An object is moving with constant non-zero velocity in the +x axis. Thf;y*xlw w;q bewx 8;0je velocity ;fx x*bqey wlww08j;;versus time graph of this object is

  An object is moving with constant non-zer yv:7 z1)s ckz)sf8vhuo acceleration in the +x axis. The velocity versus tim yuzhfvs)sk)c 17 :vz8e graph of this object is

  The slope of a position versus time graph:i8:ec/9 j n 2yujru dizo9cb; gives

  The slope of a velocity versus time graph; w kmv0b1(d*i+t9rjss 5mfmc gives

  The area under a curve in an acceleration versus time gc7ra ;6pmbh k)(i5 epiraph gives

  The area under a curve in a velocity versusn81 jeirsrs87 fyeo1( time graph gives

  If the position versus time graph of an object is a horizontal line, the obaywdymo(m gh2f *f;*19g p f)6 s0flzvject w 19hmfdf *)0p;f6gg( lm syzvf2ay*ois

  If the position vers) rjjc cf4az02us time graph of an object is a vertical line, the object isca 02r4jz)c jf

  If the velocity versus time gra qqre/3uoygt18y p 6 ubj-a-2oph of an object is a horizontal line, the object iqypqor/t-u1 y2g36jb8 auoe-s

  If the velocity versus time graph of an object is a l(cz)1bx0 mwastraight line making an angle of 30 degrees with the time axis, 1xwm)a(lb z0c the object is

  An object moves 15.0 m north and then 11.0 m south. Find both ab.t:bl7,xcfz+9 e vzthe distance traveled and the magnitude of the displacemen7vxztz b9e,b l:c+a .ft vector.

  A boat can move at 30 km/h in still water. mgd9o n55jt89ql7y:w-bysfcb j8fv (How long will it take to move 12 km up(l895-m89y cofn:w tsbyfjdjv 5b7qgstream in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609;q6l)comv9nr pn v 3g2 m)

  What must be your average speed in order to travel 350 km in 5.15c 1:3shp kgi96lyu.hs h?

  A runner ran the marathon (appn9;sox/o yecq5daz *( roximately 42.0 km) in 2 hours and 57 min. What is the average speed of the rcq ;ds9ea*oyxo5 /(zn unner in m/s?

  A car travels 90 km/h. How long does it 2d+6gue0oor4rxu 3h hi tx,v *take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. The sp* h (6gb0fhpkkeed of light0* khkgbhpf 6( 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 look to the sia )im cc og1a;av*x-5dj,n8ixde for 4.0 s, how far do you travel durincm58n,* xd-1o ;c axjavigai)g this inattentive period?

  If you run a complete loop around an outdoor track (400 m), i-ca9-sqm1 qrou 38gh rqv7 (wun 100 s, your average veloc qs91ma-(ug83w vcqr qru7 h-oity is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km exv7d da)6votc8kj gq (8hl /2x*5adxwxk 6t9dast, then dd8c8*aj 2)ttdxlx 6dvx o9(/5w x7ahg6qkv k 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 Norzsna uwr8 8w:d8rwv ns0f+) j)94gbcrth 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 th8w w:rs)s8 g0f8j+ndwcrz n9v4)ur ab e bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles. y2g957vbyvna( i+dy/ekef( k 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 schoo2e igvyy5(fvdk n97e /+byk( al?

  A motorist travels 160 km at 80 km/h and 16za sb ow7ka.a:54g.b.93xjm9 nyhu cd0 km at 100 km/h. What is the average speed abksac:mbxh j .w. 3a5z.99o4n7g udyof the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What ishx iojv*(a6v*9aa*i9wz yws9, dx) oa her average spea) jo,*dz9w9i hsva6vya* ox9(iaw*xed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and tz ezop8f 39kztjl30/+ ziau.q hen at 250 mi/h north for 750 miles. What is the average speed for thaz3 zzj3o+qp.ze8i /90ulfkt e trip?

  In a 400-m relay race the anchorman (the person whbn vjt )c(-de515i t6 nsrkgg;o runs the last 100 m) for team s 51knc6bvgi(5ntrg)d-e; jtA 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 A runner not lose the race?

  A car decelerates uniformly and comes to a stop after 81gli + dgq(k;y s. The car's average velocity during deceleration was 62 km/h. What was the car's deceleratioqg(dy+ l 1k;gin while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at tbdc-2kor9yfzb-w-zcb7( z q- he average rate of z9rbq-fk--zc2byz 7 bc-o wd($15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km pxma tnz+l98rk.wn+f7n j;8t)a 4l yf/h accelerates 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 acr,hiq+lip l)x*52 o eycelerates 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. js6 l2z:7w,xp0 4nhn rmk3nqi It then speeds up with a constant acceleration ,2j:i0pnzr 7khn 3xqn 6wmsl 4of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 3.7 m/s experig oa.f0 r:(wpj6fuc+ - m s:axbkt2us4ences a constant acceleration of:rubsau2w .c40 -o xatg6k +fsp( :fmj $4.3 \; m/s^2$. What is the cart's displacement during the first 5.5 s of its motion?

  A bullet moving horizontally to the right (+x direction) w3b 5 pjhtjj8z *sj,8egith a speed of 531 m/s strit8 8bjj5 z seh*3jp,jgkes a sandbag and penetrates a distance of 82.68 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 carqw-supdh ;-lo6e3h rl6x wk0*rier. It reaches a speed of 42 m/s ahrwud *-k6-6xqls ;3wlo0ph e t 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 j ja)4 cyptx( 2isa56u)un hgyh7q87iconstant 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 in a distance of 200 m. xn69pzv +dhk u 3bwb((What is its average acceleration +pbwh6(uznv93kdbx(?

  An object starts from rest and undergoes uniform acceleration. d9vtcr l6xp xz2) fn:7During the first second it travels 9.3 m. How far wipvz6rl29x 7n) cdxf:tll it travel during the third second?

  An object is moving in a straight line with constant acceleration. wpu*cn j,jl, :6xsd/t Initially it is travelu: xj,/t w6,ndl*sc pjing at 16 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 accelbg8:d8/ vki ijerates 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 tires0w wxcexcv6*; on a dry road can 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 trae e,0y7 ok7q tctg)mu4ffic light turns green, a car that has been waiting at the intersection starts ahead with a constant acceleratione,7ky0e4c)tom ut qg7 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 wit)w7;gthn3 l2su joc/l h a speed of 12 m/s on the surface of planet X where the acceleration due to gravityg3s2c; 7 wuojlhn t/)l 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 plw0:e cir.lem8mcgo 1: anet X where the acceleration due to graviw: oecmc81:0ergm .i lty 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 surc) sjkaftqi; n2 .;)fpface of planet X where the acceleration due to gravity tak;qip2. sfn ;)fj)cis $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

  An object is thrown upws u)5j o80bci 9xbw8opard with a speed of 14 m/s on the surface of planet X where the acceleraxs8 590c8)obou jpiwb tion 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 am89hp j;hni8d ruler between your fingers and releases it without warning, how far can you expect the ru jh8d9 n8pmh;iler to fall before you catch it?

  A ball is thrown upward at a vel n*3 5oq)oja0/n;gsiv /resnzocity of 19.6 m/s. What is its velocity after 3.00 s?sq / )0ej3 */5;onoznrinav gs

  A bullet shot straight up returns to ifwor y/33nicxy0 4y/ lts starting point in 13 s. What is the initial speed /wio c30 4lnyfr/xy3yof the bullet?

  A ball is thrown straiu0 eibdy*1 i(0+ opiehght up with a speed of 36.0 m/s. How long does it take to return toeh p0 (iye* 10bdiuoi+ its starting point?

  A ball is thrown downrax3g7pnv;4w// s dy7:(f2anvfb9 o hr efk0dward from the top of a building with an initial speed of 17 m/s. It strikes the ground after 5.8 s. How high is the beyhg fnr bx /f 7sfakdp3/(92rnaw:o0dv7 v4;uilding?

  A ball is thrown straight up with a speed of 30 m/sq 4veo;ivujq4 hx9c o8,p6pl//o(jpl . (only fill in numerical value in the blankqejpco oq9(/; opu46lpx hj/v8vi 4,l s)
(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 speed of 28.57omgdz/rzgsb;3 , g9 -wflwz: 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 11 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 11.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the ve:sa b:y,8xuy gkt +yd r:dm;(elocity at t = 1.0 s?

  In Fig. below, what is the velocity at (66:mjz:akzih/,v1rr8scyq d7h ws st = 2.5 s?

  In Fig. below, what is the velocity at twxp)zs(y v4: +spnjw nh2zc/5 = 4.0 s?

  In Fig. below, what is the veloch oy/d6rqzv,, ity at t = 5.5 s?

  In Fig. below, what is the average velocity from 0i9gg:ud:2y sj r-h5 ak to 4.0 s?

  In Fig. below, what is the average velocity froy 419lt5sc8cux; z gkym 0 to 6.0 s?

  In Fig. below, what is the a i) paq5bz0,zscceleration at 1.0 s?

  In Fig. below, what is the accelerationw3 cz:i;rvn;m at 3.0 s?

  In Fig. below, what is the average .)ugwe q/v 08vui9delacceleration from 0 to 5.0 s?

  In Fig. below, what is the average accele 3b+ysr7* x1icdpr6ocration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to -mw z9 t7/ bma4aq,mtk8.0 s?

Does a car speedometer measureo2*s 7;j uibme7wc1 ao speed, velocity? {speed|velocity}

  An object can have a varying speed if its velocity is constah1vguz0;mpe* nt.

  The velocity of an object can be negative whm.v/p lj7r*o81:o j g5gredpyen its acceleration is positive.

  If one object has a gre-:fdpwj-y f*j ater speed than a second object, the first must have a greater accelj *-pfj -fd:yweration.

  Two cars emerge side by side from a t;qd *x1;z;; wq2-bz s*hfgtmhj da k3eunnel. 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 increasing in speed as its a(o:+(vld k0it gtgkl5 cceleration decreases.

  A baseball player hits a foul ball straight up into the aizl5b/- vlx ,kfr. It leaves the bat witzxflk/l-,bv5 h 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, what is happening to itd*:6,bigw-lg;pb,h rldotn9,fs. x n s acceleration, how doeif,n,gh-l*r:btp n9.blo 6xdd,ws ;gs it change if air friction is ignored?

  As a freely falling object speeds up, what is happening to its2yjux)4 a7hsigyx0p447w xj h acceleration, how does it change if air frictio4)4yh0ja2x4xphigwx7u7 y j sn CAN NOT be ignored?

  An object that is thrown vertically upward wilw ai7(5hob5xtcc4l t zd1k(v( l return to its original position with the same speed as it had initially if air resistance is negligz xi5av1 bh4t(k t5 lowc7dc((ible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity if09 1dy( 8ekwplvei2h;kh ,nand nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration atjst5j4 5u/hq g8mn zhnv r8qqms8/rrr9b0 /:t the same time.

  An elevator moving from the second floz mddep 352b2uor to the fifth floor making no stops along the way has zeu2 3d5zpe dbm2ro acceleration all the time.

  A rolling ball moves fromh9v0o*ow7 nvm q o2i ep9v;xx- $x_1=2.1 \mathrm{~cm}$ to $x_2=-6.6 \mathrm{~cm}$ 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 $x_1=3.1 \mathrm{~cm}$ and at $t_2=3.3 \mathrm{~s}$ 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-milikvq yit /,o:feqg/*w ,1a9 hme ($1 \; mile = 1609 \; m$) track in a total time of 8.9 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away fro(r2ht vhzi2g,d :q df0m its trainer in a straight line, moving 95 m away in 12.2 s. It(hzh :dvi0gf2dqt , 2r then turns abruptly and gallops halfway back in 4.6 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 from leim; c8+6dio:ox9x4eia ygxveg14nof+z88 $10 \; m/s$ to $24 \; m/s$ in 4.6 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 fro*mz n 0 k*dcatj)6dyux(j-zo1m $16 \; m/s$ to rest in a distance of 66 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach tw)o v9h(q:ada speed of $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.5 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the bd6 -lbcbtl*y.2js8f.z u lbmso , k rc5ri-(a+locks to essentially top speed abouty-(r o b+,la-.6sr ib*m5 klc.2 8l studfjzbc $10.7 \; m/s$ in the first 12.3 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 -tyr1.(eoz(2a odas qy tb*k6from a speed of $15 \; m/s$ to rest in 5.56 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 highng u ( g:zfv8*unid5rn(hz8;lway. Assuming a deceleration :vi5 ;n( ( g*uz 8n8fnldhrzugof $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going,cn7hxqp e03, by7bra $25 \; m/s$ 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 coy:qumhm4b3r y/fme +(mplete the 10,000-m run in less than 30.0 min. After exactly 27.0 min, there are s(:fq/mr34+myb yuh emtill 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?    $s$