Suppose that an object trqdkbg)l., le49d;ue r8 yfg9 wavels from one point in space to another. Make a comparison between the displacement and the distance tg e.ddkbf9w;,e )y8l9gl ruq4raveled.

  When is the average velocity of an object equal to tw/c(:v bkn/d kae1ic 1he instantaneous velocity?

  A new car manufacturer advertises that their c.e++ pwp /ekue-qvs-q ar can go "from zero to sixty in 8 s". This is a +we psp-kvue.qeq-/+ description of

  An object moving in the +x axis expe:qg-jn izc 7-;72duleerzof 6riences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to9qbsi 8 0rx,jpq-0xd fm53dpv slow down as it approaches a trafi r-b 0pxm dq,8x9vdfp0sjq35fic light. Make a statement concerning its acceleration.

  Suppose that a car travelingluuopf/g) -l ; to the West (-x direction) begins to slow down as it approaches)flol;u/ p-ug a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a statemen:n+2ru2 9hobx-wfz+saq uel9 t concerning its an+ue x- 92z2sw b:9ofurhq+lacceleration.

  If the velocity of an object is zero, does it mean thaw .*,vjyyo h*ut the acceleration is zero? Support your answer with ahywvy,*o*.j u n example.

  Can an object's velocity cha4g vji+ ))xmccnge direction when its acceleration is constant? Suppogvic c)x)j +m4rt your answer with an example.

  Suppose that an object is moving with constant acceleration. Mye+vkn x(.2bt(g+ vk-rkx:s hake a statement concernik(:(2vxtsrgnkk h.+b+ey -vxng its motion with respect to time.

  Can an object have increasing speed while its acceleration is de 9n6eej: wz0dtcreasing? Supporzj w9dt 0n6e:et your answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. Mawmr df) *kh(k*civ75m/8bjy3ohr +zkjc; g /hke a statgj*rmh5/ ofykz8k 7 rc3; ihcwk/)j hv+d bm*(ement concerning its acceleration.

  Under what condition is average velocity equal to the average of the objectkjr (sf1*j0,j j5ref) 5hlk vrcpip18's inirrhc( p1r j eif)klj*j0 s5kp85v1f,jtial and final velocity?

  Objects A and B both start at rest. They both aun3 eqw)*lhx3d+d +3 ef 2+woy ujvry,ccelerate 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 object B?d j3qen++ur3l2yy,h*f od3 xwuv)+ ew

  Objects A and B both start from rest. They both accelerate at theyqdp4t(+1u2 3v h4 a cv1cff.poq3iw l7vst1i same rate. However, object A accelerates for twice the time as object B. What is the distance travd i4tuclvyf27vt 4w1 ph+3 v3 qpiaqc(f .1os1eled by object A compared to that of object B?

  When an object is release lxw-cit1-p:;vz)r-w wt+o nmd from rest and falls in the absence of friction, which of mn;tvxic z:w) 1ltr-wo+--w pthe following is true concerning its motion?

  When an object is released from rest andb(i 2*dieg if55wtat ac3qt+0krf09 o falls in the absence of friction, which of the following is k iiw(5tqtafb rt0di5g309 o+f*2ac etrue concerning its motion?

  Suppose a ball is thrown straighy4/its 8ycg;dt up. Make a statement about the velocity and the acceleration when the ball reaches the highest poi/ c ysiyd8g;t4nt.

  Suppose a ball is thrown straight up. What1exbol y9m5ciu+tx. .;z /jgu is its acceleration just before it rea1/ xtuexb;g.5ioz9ljcy .+mu ches its highest point?

  Suppose a ball is thrown straight up, reaches a maximum height, tnw+n6ly b) 7 ob5wq cowu gx3t:c)+gn.hen falls to its initial height. Make a statement about the direction of the velocity and acceleray ocg o:7 qu+)wgl n.n +b6w)b5c3txnwtion as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to its initiapmwu;dg fa2 )3l height. Make a statement about the direction of the m2faw3pugd ; )velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resi+7 mw* swxr7jr 95cdrkstance. Make a statement concerning its accelerd7x5*msrrcjwk9w + 7r ation.

  Suppose a skydiver jumps from w.kny ki0c4;8 ppvzb +a high-flying plane. What is her acceleration when she shw b;+ zp48c0.ivyknpke reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical second ,:e pf +orxp*qball is thrown upward 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 :e+f*o,xpp rqball go than the first ball?)

  Ball A is dropped from the top of a building. One second later, ball B is drl 5zf2ak t/i:fopped from the same building. As time progresses, the distance lk:zt2a f/if5between them

  Ball A is dropped from the top of a*y du)ggnh)(ayv *y y6 building. One second later, ball B is dropped from thegyd) (a *gnhyuy6v)*y same building. As time progresses, the difference in their speeds

  Two objects are thro bt sxh/4n*ko.wn from the top of a tall building. One is thrown up, and the other is thrown dhx/tb4*skno . own, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped f8h qnyyyuhn5:g+yq4tv 3 ;.fx rom the top of a building. A second brick is thrown straight down from the same building. They are released atn8.yxgy + v; thf:nu yh53q4yq the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constysv6 (+nnutr+ yn5q/ :ufgoq,ant non-zero velocity in the +x axis. The position v: y5(/guo,nvnqy6 rnsqu t+f+ersus time graph of this object is

  An object is moving with constant non-zero acceleration in the +x (hvd9;a 3 zyfuib.er+axis. The position versus time graph oa;u e3d(9 hbivrf .z+yf this object is

  An object is moving with constant non-zero velocity in the +x axis. The velocif+dp4fobau *2ua st21 ty versus time graph of this otfp oa adu2 ubf+412s*bject is

  An object is moving with m,xs /xw5m7k-u z9ueiconstant non-zero acceleration in the +x axis. The velocity versus timm ,7x w ksu5m/x-uiz9ee graph of this object is

  The slope of a positio1 )-ni5e r-+t o4twctdszb az5n versus time graph gives

  The slope of a velocity versus c dp:k3 cbyeuva/a+) 8time graph gives

  The area under a curvd0o3 t)vxy 63c4qsxhn3c(gp xe in an acceleration versus time graph gives

  The area under a curve in a velocity versus time graph g* xv0jdcrs*4l1pq v4jives

  If the position versus ;*b* csnp lh(t2,tkfe time graph of an object is a horizontal line, the object ;2 ,k lecp(bt*ts*hfnis

  If the position versu rhdq-9 z*n(t5 y(+w bab-l m2studxl/s time graph of an object is a vertical line, the object ist2xlby*(m/n lr+h 95( -b dazdqutws-

  If the velocity versus timotj6*x98. 5irzmxut vj a4jstp 7x *4re graph of an object is a horizontal line, the object .zxjp9* v4s6turxxtmj5a8i * ot 7 r4jis

  If the velocity versus time graph of an object is a straight line/s3nqto9aeadku)w 5t3.-n8 xh 1 igq k making an angle of 30 degrees w-1 uahsntk3 /d. )n5 3gi xa9kqeqtow8ith the time axis, the object is

  An object moves 15.0 m north and then 11y5 y. jao1hlmqe5qz t,m;+k8f.0 m south. Find both the distance traveled and the magnitude of y8e hy1m;qa. 5l5f+, qm ktjozthe displacement vector.

  A boat can move at 30 kaq:0gtvt(7pf26 ,qzr prm z w-m/h in still water. How long will it take to move 12 km upstream in a river pz0gt2 qz( f-q6p7m,wv:artr flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 l , we(hadj-rzs.4/x:9g-s wgejkw +jmi = 1609 m)

  What must be your average speed in order to tr zpa:u13(c uvjavel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. Waboffp9y;q wk;/ z f5t+xfj 42hat is the average speedyz2w 4x p5;aff+tk q9/;ofjbf of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel 46 uak,s;bq 4la00 km?

  A ly (light year) is the distance that light travels in one yq.oh bbl0ab;) ear. The speed of b hq ab.ob;l)0light 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 si /1ww:5j7xez:mvr02 c pvrqi s :eh9hrde for 4.0 s, how far do you travel durmw70 p zqrsh:e 5 1v/x9hvreri cj:w2:ing this inattentive period?

  If you run a complete m-4d ck-l9vol-y0qb 0f:talav96 o wlloop around an outdoor track (400 m), in 100 s, your average velocitl 9 oyqcvl:90d aa64l-vbw0 lomf -t-ky is

  A polar bear starts at the North Pole. It travels 1.0 km souteve/kyh 5u; /rh, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its seyrheu /k /;5vtarting 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 1.0m8j4 beg3lu 6t7k+ih q 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 8j+g 3hm uibk4e7ql6tbear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 mile61(bhhmg 5rhns. It then starts to snow and you slow to 35 mi/1h (6hm5rhngbh. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 k:bzlsauw+ k 6 ,m*avh4c5ts, xm/h and 160 km at 100 km/h. What is the average speed ol vb,s xtau* 64c5mahks+,z:w f 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 is her a v/a+p)nb/ qn1cbubs*verage speed bp+b)vu /*snqa1/nb cfor the trip?

  An airplane travels vxvy 4t;9lhh-at 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average 4vlvhx-yht9 ;speed for the trip?

  In a 400-m relay race the anchorman r e 6z)dg71y4efsxvb7 o4dik8(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 rfy dr)1 k767vesbd e8go4 xi4zace, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes to a stz0-5lt mwsu7i u4de 0s :3xcn3c y.jetop after 13 s. The car's average velocity ddcy-07 3iue.l0:swj t5est cn4m 3 zuxuring deceleration was 37 km/h. What was the car's deceleration while slowing down?

  An airplane increase-xg 832oxt7ctiepbm8k4a m/g s its speed from 100 m/s to 160 m/s, at the average rate of ti/ 87-mo8gm3epx cgtkbx24a$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates a ,fup xfa: zeb6 xr*9pjtm*cng33e am+;ow2o.t 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 accefktos *27xfx4lerates 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 mt+dd a3sp;jes;j +x euf4vx/ 2/s for 10 s. It then speeds up with a constant acceleratiojs xdxevjp4t3saf/ ; +e+d2 ;un of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial m 3198kptdxuzvelocity of 4.7 m/s experiences a constant acceleration of 98mxd13utpk z $2.3 \; m/s^2$. What is the cart's displacement during the first 5.1 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a sp9xr;m 3c sb v4b:dewb/u*cks;eed of 484 m/s strikes a sandbag and pencb du93;/; emxsrc4v b:s* bkwetrates a distance of 12.13 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 carr xjoop:w h4i-.g8b qeqhf+e85aw(k7sier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the a:8wh 8.4qao f(q7he5xewj-gpso +i kbcceleration is constant, what is the length of the catapult?

  A car starting from rest mo:y5sixc*r62)zbx w ikssgft 21 c5y )kves 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 r oa8*+ k qw);z43unas/il t4ml6cl+g nchz)c80 m/s in a distance of 200 m. What is its average accelerati4oic gn/anrh) +3;+4scctq*z6l m )k8uz l awlon?

  An object starts from rest and undergoes uniform acceleration. During the firs4q:un8sc kv6 psl8,xvl dq2/y t second it travels 9.1 m. How far will it travel during the third second?:8n/6,uqlqkp sxv yd48cvls 2

  An object is moving in a straight line with constan3 d yi;f*aq aod7)gc*6 lvd4ept acceleration. Initially it is travelinde 63agif)v7 ylda*; p*doqc4 g 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 reaqn1 - hgs .6mr9s1lzbst and accelerates 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 deceleratek:y9t+; xeqgq +j*pl t 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 tu j(,i8 m9dk)utj 9xm-wm2svgxrns green, a car that has been waiting at the interse(mtm92m9 s8x) v - ,jkuwgjxidction 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 upwa c: o1lkdd-se9rd with a speed of 12 m/s on the surface of planet X where the acceleration due to gravity issoc- dl1k: d9e $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a f)6q f/fq)elhspeed of 12 m/s on the surface of planet X where the acceleration due /6eq fqh)ffl)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 r eh l)zjvly116j4ahnq/3( wyof 15 m/s on the surface of planet X where the acceleration due tjl/ ye31jrlnya 14h)w6q h( vzo 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 upwaf lc /sc7: u.oco60qq0n w+siard with a speed of 14 m/s on the surface of planet X wheoc:0o.w i+ 0qqs/al7s n6ucfcre the acceleration 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 yjqi-5 i mhk.u:.3k rooour friend holds a ruler between your fingers and releases it without warning, how far can you exp:rk.o oj.5ikhuq-3m iect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its velo;3+bt h mr9vqqb tco l.)m2xj;city after 3.00 sxojmh+t;)c2q. rm;93qbbl vt ?

  A bullet shot straight up returns to its starting p ly.1rbv6kl7 y)r8e gmoint in 16 s. What is the initialr e8gvm yr71k6).lbyl speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long hi/cv+1s +wp g4wx.st (-mosl does it take to return sc-.twxslwv+og/ 1+ mis4(hpto its starting point?

  A ball is thrown downward from the top ofc ctww6 kzdq; 4rqcex1exr2j.;3c 2h 6 a building with an initial speed of 14 m/s. It strikes the ground after 4.2r;x6xe c1twhck j4;zr.32qeq6 wcd c 2 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in n.m, 3vf iemk0dumerical value in the b3fki m me,d.v0lanks)
(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 sph5 nwkt;sr6/x4cx 1pyeed of 28.4 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 9 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 9.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is th8g42 zubhlse:k c3 *cwe velocity at t = 1.0 s?

  In Fig. below, what is o50 inj5 9 jfc3dzhju0the velocity at t = 2.5 s?

  In Fig. below, what is 9e154 wlys iqvthe velocity at t = 4.0 s?

  In Fig. below, what is t ;;hisrs e;(wyhe velocity at t = 5.5 s?

  In Fig. below, what is t pw+qx yir*tbw*,d;-a he average velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 tovxtnlu8i6;f x c2 y-b: csu(1bwu+r1m 6.0 s?

  In Fig. below, what is the acceleration at 1.0 ss3hch(x76-8zo)6 gij kiv mdf?

  In Fig. below, what is the acceleratnpvp6zq )n 5t6ion at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0zx,om8b 2z joho51 s6iu3*xqs s?

  In Fig. below, what is the average acceleration from 0 to 8.0 s?tg6t 2uzazah31;(mceucrr 55

  In Fig. below, what is the displave z 8(/hx: 2zl;ba-;w eqrn vs()cnwacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity?z) ,p3qej p p0bnj7m8b {speed|velocity}

  An object can have a varying speed if7oo h l(x2cuc5 its velocity is constant.

  The velocity of an object can be negative when its acceleration is posm waljsyx3071itive.

  If one object has a greater speed than a second obozh;ff +o sa:swf6:1 lject, the first must have a gro:a s6wzf1+lf:fs ; hoeater acceleration.

  Two cars emerge side by side from a tunnel. Car A is trave sziyd) y/li:w z5m7u6ling 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 acce*ih bhdi*lk- uux,o5(o /s3unleration decreases.

  A baseball player hits a foul ball straight up into i8 .kiep7x7iothe air. It leaves the bat wiko87e7p xi i.ith 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 its accelxv.p t4xa sv:7eration, how does it changep 4sx7.vva: xt if air friction is ignored?

  As a freely falling object speeds up, w tg kn s91cm7( a,je8w3pp8ibshat is happening to its acceleration, how does it change aw7nsbp 39g(, 8sp ej81m ktciif air friction CAN NOT be ignored?

  An object that is thrown vmdplppptv :to7 /;ag m9: ep6/ertically upward will return to its original position with the same speed as it had initially if air resist p6tm9o/tp:pdpvg:p;m/ a7el ance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzerm0u: 6 pv.ifwfo acceleration at the same time.

  An object can have nortbnwspcwqh94g(c. -ug q- q wro8 ,2/nzero velocity and zero acceleration at the same time.

  An elevator moving from the second floore+vmx ww6 9qy1;5ib sm to the fifth floor making no stops along the way has zero accsm9 ebww; miv6+yq5x 1eleration all the time.

  A rolling ball moves from (,zrzvb x.ed2$x_1=2.1 \mathrm{~cm}$ to $x_2=-7.5 \mathrm{~cm}$ during the time from $t_1=1.6 \mathrm{~s}$ to $t_2=5.7 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.0 \mathrm{~s}$ is at $x_1=2.4 \mathrm{~cm}$ and at $t_2=3.6 \mathrm{~s}$ is at $x_2=7.7 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around n +.k2fbo hn-3 phmpv0a quarter-mile ($1 \; mile = 1609 \; m$) 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 from its trainer in a straight li08 tsy*lfn -q;rsoeu6cf0 cjs v5:rj.ne, moving 108 m away in 8.5 s. It then turns abruptly and gallops halfway back in 4.6 s. C6so0*j- jfqtnuy8 cv rsr0s.fl;ce : 5alculate (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 frossf d 5i4 2)5nw,oozokm $13 \; m/s$ to $24 \; m/s$ in 5.1 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 fro4 : 7c+nskbew3kygg n;m $19 \; m/s$ to rest in a distance of 78 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed o/fr9b*0dfx l ,(o)zglqbc3md5 .bc8 ojprv.uf $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.4 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can bur0onwl mm :g gg7c,yu:)st out of the blocks to essentially top speed about ggngou0c ,m) 7 ::ymlw$10.4 \; m/s$ 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 ftxd su*bm*9nz pt5w0dor0v/t f81h8 erom a speed of $20 \; m/s$ to rest in 4.03 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m llle+mvpxga*7q kk l,;sm676yjw -a- long on the highway. Assuming a decelem ae slll-vpa;kg-jyw l q,7x6*7mk+6ration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truc ag *i/9.cwzock 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 in less tha bm s26p+7miqa5vt)d fn 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must then accelerate atm+bqtvf2d7 6p5 ims)a $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$