Suppose that an object travels from one point in space to another. Make a compt:p o,q0 w,(q x k(/ljnj: 3rgr1apjfparison between the displacement and the distan,ogpr tk/:j(n: j3qw x pqp0farjl(1,ce traveled.

  When is the average velocity of an oqlc: ;xjn7 pt:bject equal to the instantaneous velocity?

  A new car manufacturer advertises that their car cleuh smnu7t 9s+r mo49k1wk61an go "from zero to sixty in 8 s".979tr uk6n o4m uh1swslm 1+ek This is a description of

  An object moving in the +x axis experiences an acceleratp qkwy2v6 g*.ma f5w,e8toz5xion of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x di+c r.czmgxe yfh(3bo0 tu( f)d;t(u.g rection) begins to slow down as it approaches a traffic light. Make a stateme t hc(ydgm.ucb+ f gxe). u(z(0or;tf3nt concerning its acceleration.

  Suppose that a car traveling to the West (-xit8r0 ,ha,xacvlff +47i l1dh direction) begins to slow down as it app iv acla0+i7,l84dhhrx1tf f,roaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make wywi4 )6y4)w :silnyp a statement concerning its pw 4sl4:y6)iyw ywn i)acceleration.

  If the velocity of an object is zero, doer) mugfw4m 1)os it mean that the acceleration is zero? Support your answer w 4fg)rmo1)um with an example.

  Can an object's velocity change direction when its acceleration is conszyn2- af16 xmhtant? Suppor2 yh-m6xz1fnat your answer with an example.

  Suppose that an object is moving with constant accel tq0n ee8)sz1ieration. Make a statement consnze 8 )iq0e1tcerning its motion with respect to time.

  Can an object have increasing speed while its ac t)t1k)qq4e55ur u.ew hjzwq5 celeration is decreasing? Support your5u5jq5 u1zh)wtq)req. e 4t wk answer with an example.

  Suppose a can, after an initiao4kvul;d3:k wj 5uk v2 h q)jjsh;.s4hl kick, moves up along a smooth hill of ice. Make a statement concerkh5l v.42 4sj;qjjkh ;s u vdho3)wu:kning its acceleration.

  Under what condition is average velocity equal to the average of the objev-8-oturv,rz5b6.t oetbop +ct's initial and fin- z rter-5ov8tbo.+vbo6u p,tal velocity?

  Objects A and B both start at rest. They both accelerate at theqkjm 0uw9.5s0g q c*gii8 b6hs same rate. However, object A accelerates for tw*gwjm.6q qb0ihucsg i89ks 5 0ice the time as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the same .y,gqgw3j)t3zac ; l4z bn e;x6v7twqrate. However, object A accelerates for twice the time aw3eqw7jx,b).ygtgcq ;n3;6vz a z tl 4s object B. What is the distance traveled by object A compared to that of object B?

  When an object is released from rest and falls in the abrb1+ur4w24 xh7 rumr qsence of friction, which of1 q4ur 7wx r2mrbu4r+h the following is true concerning its motion?

  When an object is re8a )eln/m ;6 vz 55cgakoj0.t8stnhsvleased from rest and falls in the absence of friction, which of the following is true concerning its moticak8n05vsg5h nl8z)sat vj.6oe; m/ t on?

  Suppose a ball is thrown straight up. Make a statement about the velocity and mm 3p5::y;p ayaljr4qhns4+lthe acceleration when the ball reaches the highest poinmpjh:q;r 4la4 ly5anp 3:y+s mt.

  Suppose a ball is thrown straight up. What is its acceler1w .l(asg5gyipo k( 7cation just before it reaches its highestaslkwc(17 g.i(po 5yg point?

  Suppose a ball is thrown straight up, reaches a maximum height, then far42.iy oamh0ells to its initial height. Make a statement about the direction of th 2. ery0aio4hme velocity and acceleration as the ball is going up.

  A ball is thrown straightgg/h cu0 0id3h up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity00h 3hgi/dcgu and acceleration as the ball is coming down.

  Suppose a ball is thrown .en0u n d)aaq1cs3xs d .sn1hleam1:3downward in the absence of air resistance. Make a statement concerdsd3uscnqh 11nm es:0a xe anl3.1a .)ning its acceleration.

  Suppose a skydiver jumps from a hivl4* bh2 y:wmfgh-flying plane. What is her acceleration when she she reacheyhb4lm f 2:wv*s terminal velocity?

  A ball is thrown verticallyeb8:u4:sufza upward with a speed v. An identical second ball 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 se:fu4bu ez a:s8cond ball go than the first ball?)

  Ball A is dropped from the top of a bui r/ds ;:7 j;+gknc0mqbnmj z,alding. One second later, ball B is dropped from the same building. As gqmnn ; ,ad+ :sr0/mcj7;bzkj time progresses, the distance between them

  Ball A is dropped from the top of a buildi;jts20fxsm: qar,; m jng. One second later, ball B is dropped from the same building. As time progres tqm;aj;rjs,0 sxf2m:ses, the difference in their speeds

  Two objects are thrown from the top of a tall buio-ho s,wolct()5-r d )m,y wjklding. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when theymd)jr-ks 5o ,w(oyl )wt, -cho hit the street?

  A brick is dropped from the top of a building. A second brick is thrown straig;rz3ue*c8nu e ht dow3u*ruzne ;c8 en from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with cos nvz4rqo33+cnstant non-zero velocity in the +x axis. The position versu+s4vn cor z33qs time graph of this object is

  An object is moving ms1)6 b; ou6nzhi e; :g3sy cjk5wiki(with constant non-zero acceleration in the +x axis. The position versus time g zym6niio63 s( 1;5wchk): ksguej;ibraph of this object is

  An object is moving with c l+pk9z9l bt6-s,y jvronstant non-zero velocity in the +x axis. The velocity versus time graph of this+s6z rtyl-blpj k,v9 9 object is

  An object is moving with constant non-zero acceleration in the +x axis. The7: a cmnx;n -pj6qqty6 velocity qtp6x;qy n:j-7can6mversus time graph of this object is

  The slope of a position i lsp:c1 kp obkv(,2a7versus time graph gives

  The slope of a velocity versus time graph :93+-ckuzpflh1aggz gives

  The area under a curve in an acceleration versus time gra*zl8gfq2we f2n: m kg6ph gives

  The area under a curve in ,w ae0b0x al)2e ev-lk q,cq+aa velocity versus time graph gives

  If the position versus time g90 0)b0;ytk-(qtutodi yna abraph of an object is a horizontal line, the object i900iutttqya-b ;bnoa kd( )0 ys

  If the position versus tid7x 93itb(rn fme graph of an object is a vertical line, the object isi7 t3( r9dxfnb

  If the velocity versus tz-yq8xy2no i+xu1o:eime graph of an object is a horizontal line, the object i: yo2oux q-1i8+zex nys

  If the velocity versus time graph of an object is a straight s;e- xzm;d33/br sqcf04f gsmline making an angle of 30 degrees with the time axis, the ob sc;fds3srx4z;b -/meq0 g3 mfject is

  An object moves 15.0 m north ad +p /btyqyvsle7jn1e d53 q2*nd then 11.0 m south. Find both the distance traveled and the magnitude of tyd b3 lst2 1/qeyp 7qvnd+5je*he displacement vector.

  A boat can move at 30 km/h in still wateogod+c0 29s+ )vgabo hr. How long will it take to move 12 km upstream in a river flowin2s9d a)vo+ob gc+oh0g g 6.0 km/h?

  55 mi/h is how many m/s? (1 mi zz(* bnv h/ym63:ummcu,8go/ nz.okl= 1609 m)

  What must be your average speed in order to tra5y7 d;oyak/v3i:dvu vvel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and1 sus1yy guc8n qt077a 57 min. What is the average spes10qacy8s7yt 7u1 ngu ed of the runner in m/s?

  A car travels 90 km/h. How long doescv0fm hv6)jg3 - mv7wr it take for it to travel 400 km?

  A ly (light year) is the distance that light tqas/ 0w2dv jttvgqf k(1 :5x,iravels in one year. The speed of light isa( ,:twv5xd0 2qkis vq tfjg/1 $3.00 \times 10^8 \; m/s$. 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 xu5mx2.p+1ufp,w u1z)cvw ku the side for 4.0 s, how far do you travel during this inattx1+uwp )wzufp ,1c5u2m.xukv entive period?

  If you run a complete loop (l g89yvdooe +around an outdoor track (400 m), in 100 s, your average ov 9yl8 +odge(velocity is

  A polar bear starts at the North Pole. It travels 1.0 km sou/ea-wgaw 4h(1vdlx:ey (e 4j3ahv0 eeth, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This tri34hjagve- 4d( (vw1ewaeel h e/0y:x ap takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. m6 b+e0vhp(4zts wc n 5;/iocick 7:agIt travels 1.0 km south, then 1.0 km east, then 1 p /z :anobvsc4mh 5gi;7(e+w6kic0tc.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 weekewj)aa:yge s .pt*pe61nd from school at 55 mi/h for 110 miles. It then starts to snow aep *wa)t.p:e6s yj1g and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 *vpgvmk+h myf. ) opx(j9tj;7km at 80 km/h and 160 km at 100 km/h. What is the average speed of the mom.hxjmgv 7pjv9kf tp ;)yo+*(torist for this trip?

  A motorist travels for 3.0 h at 8 ckstt3hrhc+72sgdkr/5e f : 20 km/h and 2.0 h at 100 km/h. What is her average speed for the t7et ft3: rhh5sc2sc rk/2g +dkrip?

  An airplane travels at 300 mi/h south for 2. to3k,l:9oz f8cbsx6t um ;o6n00 h and then at 250 mi/h north for 750 miles. What is the averagzk ubt :;tno8696sfml cx3o o,e speed for the trip?

  In a 400-m relay race the amj-c:9rf5 1cq2k*ueqse3b tq rv.u3g nchorman (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 race, in order that the teqr :ke1ctqvrgf29-*s cu3e5 .jb3qu m am A runner not lose the race?

  A car decelerates uniformly and c dl9sz+4ga n2 u.gobzl4/c hqheg2;c1omes to a stop after 9 s. The car's average velocity during deceleration was 53 km/h. What was the car's decelerati4;1g9hlzub o q4accn g sgl22d+.e h/zon while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the avyj 40si-(pqjp erage rate of 0jpj(i yp s4q-$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rahz 1q y9h6yf vy:g,2fkte 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 am g.n0 *bvo9khnd accelerates 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. hh3/.a wgyb7r It then speeds up with a constant accelerationa3./ y7ghb rwh of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 3.4 m/s experiences a constant acce7 cn)hhqk1abn )2;i )abr3eeeleration oaqnh7nkechb)))e;13aer 2 ibf $4.3 \; m/s^2$. What is the cart's displacement during the first 9.2 s of its motion?

  A bullet moving horizontally to the right (+x direc 5asrlwoy5-/7n/yld +-zegi t tion) with a speed of 578 m/s strikes a sandbag anrl - 5ayy 7o/-ied /gns5ltzw+d penetrates a distance of 46.87 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an airc3 ad azscnh 3df;vqm l+83.mm:raft carrier. It reaches a speed of 42 m/s at the end of the caaz+mvh8 d:n3dcmm s3qlf a;. 3tapult, 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 acceleration of1,e sm; rui5ld $2.0 \; m/s^2$ 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 ui .d 5:zv-mf3g yhgz*of 200 m. What is its average accele. 3y5 gi*-:hmfvdz zguration?

  An object starts from rest and undergoes uniform( qo:7l2e dws7cpes ,t acceleration. During the first second idwpot,s sleqe :c727( t travels 8.2 m. How far will it travel during the third second?

  An object is moving in a straight line with constant acce.ndzh,.+uhi g 43v jleleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. Hn3id +,4 uzhlhv .j.egow far does it move during this time?

  A car starts from rest and accelerates uniform; gb5* ffq,,w)ycjvpc ly 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 drya k5 zy/ez:6qfhg*k -y 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 traffic l l fdsj.u 4h89cawpo2gjx m17h9(n1qdight turns green, a car that has been waiting at the intersection starts ahe. n9 owxgs8j29qhauhf7c1dm 1l(pd4j ad 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 the surface of pl3a 60npoh bv/ipercu6 ro+6- nanet X where the6on rapuh i0e6v / b+-nc6por3 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 planet X(6)lt - chyy9htr-yzi where the acceleration due to grav-hthz-69lycry t) (iy ity 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 mp -o7)e,5 scjl ud)7a uqjd(ox/s on the surface of planet X where the acceleration due to gravity ( ,5s7od7j pa)ouju-e )lcxqdis $2.5 \; m/s^2$. 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 p nujc3vv14lvx1p7y9lf, ha- qlanet X where the acceleration dny141,vhl793lv pfu-qj v axcue 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 friez pb:jn hle.m6 w3y28zw/qp4hnd holds a ruler between your f wz3 h62hbpz.:nwmepy jq8/l4ingers 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 (8: bvrom+mtb/s. What is its velocity after 3.00 s?:m+bmt vor8( b

  A bullet shot straight up ix3btv7d 3 5eereturns to its starting point in 5 s. What is the initial speed of i3x 537 ebtvedthe bullet?

  A ball is thrown straight up with a sp.uyezm m,68i *sq8)f 9t ftex dy5s6zdeed of 36.0 m/s. How long does it take to d*zqm 6s8. xdy6,5fst 9fu m8teiyze) return to its starting point?

  A ball is thrown downward from td543o qd+dqws he top of a building with an initial speed of 6 m/s. It strikes the ground after 5.3 s. How high is the buildingw 3d4dds+oqq5?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numerical vaf/0 op /sca a; elcnmd,0ukc32lue in tha3s0ucdcm o,ecpkf2l/n 0 a;/e 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 into the air w5pdnbwd/ fo .rrociqc( gmc;1.*ru )) ith a speed of 42.9 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 7 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 7.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velo q37chd6ve( .wm -xqmjcity at t = 1.0 s?

  In Fig. below, what is to n.dx)0zawq x9+*;ekx4lxqqt(*rfnhe velocity at t = 2.5 s?

  In Fig. below, what i+l mlih j);: ,az95(*rbaxszkz,bpecs the velocity at t = 4.0 s?

  In Fig. below, what is the velocity at t = -wf/hgg,-i+b40 9zl e gz5xq u6jkflz5.5 s?

  In Fig. below, what is the average velocity from 0m1g9 s9nc b)5goaw3zb to 4.0 s?

  In Fig. below, what is the average velocity from 0f il)3 37wms(bk4,g(nu bvw ea to 6.0 s?

  In Fig. below, what is the acceler3oe8k kkqz7ik4d8ea z8 8bse4ation at 1.0 s?

  In Fig. below, what is the accele imbfgyt jc-* l(*y+c(ration at 3.0 s?

  In Fig. below, what is the average aueos1g g 4rf49cceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 8.0 kkow)y 9fw 78as?

  In Fig. below, what is the displacement yxbn(1his2 1 ati*q;r4g7a 9 q5jucavfrom 0 to 8.0 s?

Does a car speedometer measure speed, vefo u6c9u5(jogqy8r z2+y hmg5locity? {speed|velocity}

  An object can have a varying speed if its velocity is cogucitc.9(slg - gve94 nstant.

  The velocity of an object can be negative when its acceleration is srx l8c3is2kq*r*h* upositive.

  If one object has a greater speed than a s; k oo6h4emi(iecond object, the first must have a gri6me ;hoo4(i keater acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling with a speed qdqzud/69 dvsy7x+n5 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 increa,f wwtxdt; (+hm+gx*h ak6z+using in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the aic2d3 da1bkl d 9+ne7esj *8fqgr. It leaves the bat with a speed of sqa7923d 8lgfc end *1+dbjek$120 \; km/h$. 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 objec1um4x j)eyfh2b)ovu p2*xcz4t speeds up, what is happening to its acceleration, how does it change if air friction is ign)b 22ue z)14jmxxv hypfu co4*ored?

  As a freely falling object speeds up,w2spgsc:,m9s: ga7px h60yeqoc4z y8b 25 m uh what is happening to its acceleration, how6x 2c78swsb g 4 gh05:eo2apzcp:hm,ymyu s9q does it change if air friction CAN NOT be ignored?

  An object that is thrown vertically u.ii 3 lb-r-cwj53j2ra.bs-o zfn6evs pward will return to its original position with the same speed as it hab3sw32jfnvi-s-c. .lo ar5 e6jzr bi-d initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zerj +njad6f 20o)h.s sqao velocity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero ap3k/(vx q5g odmiaj87 cceleration at the same time.

  An elevator moving from the second flc2(/ h3bgx86zwozr h u)qlej9wr. g,xoor to the fifth floor making no stops along the way h2lujww ) herb, 3 z/z8xx6(gg9oq.r chas zero acceleration all the time.

  A rolling ball moves from uq9z2uou56j/c:i iwhp2 vmq)$x_1=2.1 \mathrm{~cm}$ to $x_2=-6.9 \mathrm{~cm}$ during the time from $t_1=2.9 \mathrm{~s}$ to $t_2=5.1 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.5 \mathrm{~s}$ is at $x_1=2.6 \mathrm{~cm}$ and at $t_2=3.8 \mathrm{~s}$ is at $x_2=8.0 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps arounea;erk z;y9yp0uv9y (d a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.2 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 linekg5zr7 ke5j82tjk-xoyng f1p .d t)f7 , moving 112 m away in 14.0 s. It then turns abruptly and gallops halfjkkto-)pjx5gkf1 . 8ytern d75f 27zgway back in 4.5 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 frl;i:ku(;im k,usfx , 7ohm u+zom $12 \; m/s$ to $25 \; m/s$ in 4.2 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 p.a3: mgmhflsi,qz 1 m:) 2hex$20 \; m/s$ 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 spe1 nt4h3 pe;aon p3wnl.ed of $25 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.9 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out,iuo)e xqv 9:m of the blocks to essentially top speed about :),uxe9qiv om $11.3 \; m/s$ in the first 14.1 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 hk b g55l2jg.qspeed of $19 \; m/s$ to rest in 4.35 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 highway. Assuntt2 e 6l2;c :clds0ciming a deceleration lt: 2;teds6l0n2 ccci of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck go1wn0 qy6c- yzwp iqr24ing $25 \; m/s$ 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)v/pruo q (a:hmca y38qu8z0 kn less than 30.0 min. After exactly 27.0 min, there are still 1100a:kamqv)c/8u(rp q 0 oyz u3h8 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?    $s$