Suppose that an object travels from one point in sp4:8odd7d( d hks8xi wcace to another. Make a comparison between the displa x8:8kddh4i( 7d ocsdwcement and the distance traveled.

  When is the average velocity of an object equal to the instan*9ej : /z/ yr /g;v+bsikouysptaneous velocity?

  A new car manufacturer advertises that w3oyh, 7t iyo.their car can go "from zero to sixty in 8 s". This is a desoiw,3tyh yo7.cription of

  An object moving in the +x ax j9iqgjrp 25+zgf m4hmtms8 ;-is experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x r)a1 p4naj3fzq3nt e-sja,r,direction) begins to slow down as it approaches a traff 3e4 rfrs)jazq1anp, n,tj 3-aic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direct 0u8dliob( 1diion) begins to slow down as it approaches a traudl(d 10bi8oiffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a statementtoc fyv)m .0)o6fr-om 2ms8tk concerning its otmm8)r ycf. 6fvskt 0oo-)2macceleration.

  If the velocity of an object is zero, does it mean thatt/ h8s m,z9dcn3jbvyy u.2j5 d the acceleration is zero? Support your answjujt 2b3n8s dz9d.vy my5h,/cer with an example.

  Can an object's velocity change direction when its accelerjp/;tn.wfwn h: - s7csation is constant? Support your answer with fstcwnn:w 7 /h;sjp -.an example.

  Suppose that an object is moving with constant accelerl r0u/wmh 4r 1 w1hkoioy8p3m0ation. Make a statement concerning its moti0r/ wyow13o81l ih40hrp umm kon with respect to time.

  Can an object have increasing speed m9rb z*t5 i5scl3z1u0d xzj(v while its acceleration is decreasing? Support your dr1u3c v z0ms z*i59(5lxbtjz answer with an example.

  Suppose a can, after an initial kick, moves *ykzdlwi e a 2g0314hhoekl7zy6y9 ;eup along a smooth hill of ice. Make a statement concerning its aca* ok 2zd1 4h9ygye6z3 eh;7ekiwl0yl celeration.

  Under what condition is average velocity equal to the average ny(ey7gx m/t5pjo*i1cfx*u :of the object's initial and fin *y omi(5uj*tnx7e 1gyx f:c/pal velocity?

  Objects A and B both start at rest. Th:cp,mulh )om6cjh0 3hey both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of obc lh:3ujh hm0)cp6m,o ject A compared to that of object B?

  Objects A and B both start from rest. They both accelerate/0,bs h84u/n r vmscrl at the same rate. However, object Ab04// hvr8usr sl,cnm accelerates for twice the time as 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 absence of friction, whichvjdv-0 8kq;tf e* 5 l: )yuf4hg1tkwla.r+gee of the followiyk )lrgtlf 0vdgkv.8hf+5ua1:j; e4 w*-eq teng is true concerning its motion?

  When an object is released frn: 5hs n-(5fcc8dx * vodazp*fom rest and falls in the absence of friction, which of thxncndf o5cf *(:zhpd-v8* sa5e following is true concerning its motion?

  Suppose a ball is thrown straig alssgp5 u2l13lc.sa1ht up. Make a statement about the velocity and the acceleration when the ball reaches the gp1sual 5lls23 s1 a.chighest point.

  Suppose a ball is thrown straight up. What is its acceddo5zmi t(tjj65n 3r;d+divp w+*ma4leration just before it reaches its highest poin5 j6+ dm d ad4+prv5izjnmw(oitdt3* ;t?

  Suppose a ball is thrown straight up, reaches a malbhuu0u/v:hwn u62v. ximum height, then falls to its initial height. Make a statement about the diru /hl0b wn.:h2uu6u vvection of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then fg1e m*c/.v qj8wdlx +balls to its initial height. Make a statement about th1vwm g8q lxjc/ +e.d*be direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Make a yfbs,mm9/f7 vx9 keuy 9feb +9statement cof sb97 9xv+9yffmek ,b/ 9euymncerning its acceleration.

  Suppose a skydiver jue kfe,a s6lmewk /25:vmps from a high-flying plane. What is her acceleration when she she reaches terminal veloci5ak:ke f /e,2w6vmslety?

  A ball is thrown vertically upward with a speed v. An identical,p caw9f)a(dpy c pd)/ second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height fppw9 ad)(d ycc,ap)/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, bco*i:51n iu fvall B is dropped from the same building. As tim c1o iu:vfn*i5e progresses, the distance between them

  Ball A is dropped from the top of a buzpz*)k lt9h1x ilding. One second later, ball B is dropped from the same building. As time txz)lhz p*91kprogresses, the difference in their speeds

  Two objects are thrown i 0okbtseu)5 7kmgy4;b mp;w0from the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. W0pb m4me; g0)swtykio75 uk; bhat are their speeds when they hit the street?

  A brick is dropped fraa6hc+ .yxwc*om the top of a building. A second brick is thrown straight down from the same building. They are *yahxcac+. w 6released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with cgg, is b+d40sf *lf3p mo74wtvonstant non-zero velocity in the +x axis. The position versl4gi b*pm7 o+0vdsfs4g3f,t wus time graph of this object is

  An object is moving with constant non-zero acceleration in7ym +o(s. 77rcurmetg*h i c:f the +x axis. The position versus time graph of this(e *.sry7g7 o ummhicf7+c:tr object is

  An object is moving with ( wdzcs)eimdhhy 0 +../jti.dn5 (ealconstant non-zero velocity in the +x axis. The velocity versus time graph of je. i ia(dt/c.5l+hm(dn. )d hs zyew0this object is

  An object is moving with cona4 0xjpb q(d9jstant non-zero acceleration in the +x axis. The velocity versus time grapqdj9 40 pjaxb(h of this object is

  The slope of a position versus time;m br2, osetrzp.d/4- di:r ge graph gives

  The slope of a velocity v o3x7b5y0zm ;8+fvh itgu 7asfersus time graph gives

  The area under a curve in an accelera-p /i /z69ub /qwulbck*0zplugw l4j:tion versus time graph gives

  The area under a curve in a velocity versus j f) y zlb 3m7iw;bo1bwe(e3t2time graph gives

  If the position versus time graph of an object is a horizontal line, the object :*hg:9kjcncg is: j9c:*nkgh cg

  If the position versus time graph of an objeq d,3gvuz+ae)m7mflngp u r08w8e 2f-ct is a vertical line, the object is ,8rn-f0 8fmuz 3qdp+a 27mugewv ge)l

  If the velocity versus time graph of an object is a horizontal o, 5pr1sx* wz6lefl/ k)*rjkmline, the object fr 5k*/reo6zm j,skll1w*)xpis

  If the velocity versus time graph of an object is a straight line mak0 e9h.4bsxrl+c5uqn3) f o hoting an angle of 30 degrees with the time atrb 5s4.)co9oxe 0h+h qu nf3lxis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find )bmjhxicox 9ek o/(; 8both the distance traveled and thxc oj;bhm (8i k/)ex9oe magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to move 12 km llmtbl */anxcko(4r b.)j723cae :u cupstream in a river c7.lrtno*4bc x2cebk )/la3:l (umja flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi .6zvntgu(:pt = 1609 m)

  What must be your average speed in order to travel 350 km in 5.15pc/(fht4j3/5 hv adza h?

  A runner ran the marathon (atpu3fbe a ,x9-pproximately 42.0 km) in 2 hours and 57 min. What is the average speed of the runner in m/ebft93uxa,p -s?

  A car travels 90 km/h. How longc 8kp/hogo 00c )0cakd does it take for it to travel 400 km?

  A ly (light year) is the distanc)6iwc 5k(fb6 6ctxtape that light travels in one year. The speed of lig56t k ) ft(66acicwpxbht 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/ hn9fty mv- e5c(zylm7/hl5f,h along a straight road and you look to the side for 4.0 s,(c/z5m5f 7le myy,fv tn-9lhh how far do you travel during this inattentive period?

  If you run a complete loop around an outd4rr:ef 5lz oyk9;f -cgoor track (400 m), in 100 s, your average- 5:olcrrk z;f ey9gf4 velocity is

  A polar bear starts sjh4k , ;zov +z5alqf4at the North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km nojs 4az+lqk4v,zfho 5 ;rth, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 kq f9hjm fm:j0t rnz2n3f;(pm :(d:vlem 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 the b ;rf (m:m9j0z q:ndtjpl (:fnv h32mefear's average velocity?

  You are driving home on a we(; qrjw8q)rawtl7 q :wekend from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arr) lt: j;qrqww8(aw7qrive 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 x hioz ic,;k.z-04r, dz)mebb km/h. What is the average speed of tdo.,x)hbe0m, ir -zkz zib;c4he motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. Wr t rhrag jfn7h*.+fo6 tsbi-67s::r 9 frhyb;hat is her averag r9iafjbrhf*:hb rt:o; r-n6s.f +rsyt767 ghe speed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at uql/ 3;(oqiyrn+x:uz 94rave 250 mi/h north for 750 mileeivy4 xu:l+/a3q; o r9nq(u zrs. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the persg9cl.ha+bpb2z k8) qk on 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 team A rkz8+hg) bp bl.qa9kc 2unner not lose the race?

  A car decelerates uniformly and comes to a stop*d 4.0,r*tk4ef: e 9 t.5dkro pyigjchp vz4mp after 14 s. The car's average velocitm, .9evjz p*odf4t 5:4t cydkg.0pk pirh4e*r y during deceleration was 67 km/h. What was the car's deceleration while slowing down?

  An airplane increases its :l d em+0sw1ofvs;86b kp.zsospeed from 100 m/s to 160 m/s, at the average rate of ;.l6 8sm1ops+ ke0d wvob:fs z$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at .us i(jthv.n fqy1s ,/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 accelerates attsntu 3vi o4.4 $4.0 \; m/s^2$ 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 soy 0q;n 0u9 .dbeifg9.ddpdc .rjce/6 peeds up with a constant acceleration o9.j0yurdedoc0b idfe 9 pgq.; nd6./cf $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 1.7 m/s experiences 6ktfobh (m5n 8a constant acceleration ofh 5kob6 nf(tm8 $4.8 \; m/s^2$. What is the cart's displacement during the first 8.9 s of its motion?

  A bullet moving horizontally to the right (+x di mi )fu1da*b;e,9 eemgrection) with a speed of 254 m/s strikes a sandbag and penetrates a distance of 39.72im a1bd 9em*,;ugef)e cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is v c6fu3) haoj55:isww launched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assumin)f35i6j u5ww h oavc:sg the acceleration is constant, what is the length of the catapult?

  A car starting from rest mo1n g 4okz-x07t ,vr4;sqeoivkves 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 mjwexeu4 yv 8 )hwhd(*//s to 80 m/s in a distance of 200 m. What is its average accelera)j(hhe /8wd4v xu*eywtion?

  An object starts from rest and undergoes uniform acceleration. kb -pe;30j9rs vc *qxb During the first second it travels 5.6 m. How far willpvrj b-s*qc3ek0 ;9bx it travel during the third second?

  An object is moving ie r06+4 yl .oy:cnbvicn a straight line with constant acceleration. Initially it is traveling at 16 m/s. y bve.i ny c+0r:64ocl Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and avk;nh02ju-gk)o s tmyb tka53q ii28;ccelerates 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 dda0b3): o u *vjb 0a3j3cjjzfqecelerate 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 turns green, a car that has been waitazqt robqyw4;8,uk. 7ing at the intersq 8y zt4,qr;a.kb wu7oection starts ahead with a constant acceleration of $2.00 \; m/s^2$. At that moment a truck traveling with a constant velocity of 15.0 m/s overtakes and passes the car.
(a.) Calculate the time necessary for the car to reach the truck.    $s$ (only fill in numerical values)
(b.) Calculate the distance beyond the traffic light that the car will pass the truck.    $m$ (only fill in numerical values)
(c.) Determine the speed of the car when it passes the truck.    $m/s$ (only fill in numerical values)

  An object is thrown upward with a speed of 12 m/ic6 11000bf1bqtwgg q1zutg j s on the surface of planet X where the acceleration due to gravigu 1 0t16q tq0bbwz0fcji1gg1 ty is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speil- 6j3e6 a:oenyyh/fed of 12 m/s on the surface of planet X where the acceleration due toei6oy3y-e/hal6 :f n j gravity is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upwardr:o 5nyg**oy p with a speed of 15 m/s on the surface of planet X where the acceleration *ygro yn* :po5due 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 s3blsssly v4z6 qtca)8l, (y r;peed of 14 m/s on the surface of planet X where the accelet;cbvs q6zr(,4 s yly 8)lsal3ration 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 t21b,9tnvzsn5(jg )uoio;mt h han 0.10 s. If your friend holds a ruler between your fingers and releases it without warningo5sn, ()tom ibg nu2tjv; h1z9, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocit hepvv (;t6 b/,*swi7xere1cmjzrx +) y of 19.6 m/s. What is its velocity after 3.00 s )x s1ij;w rheczt+ebrvx67pm( ,e*/v?

  A bullet shot straighthvcrsf :55i:g up returns to its starting point in 19 s. What is the ini5 ivc:s:gf5hr tial speed of the bullet?

  A ball is thrown strgdgge8j 0aix vl q..5:aight up with a speed of 36.0 m/s. How long does it take to return to its starting poini.a5d g 8jvqeg.x gl0:t?

  A ball is thrown downward f:anv2mf(52 qzz- j t v.o; o;tt*jhlazrom the top of a building with an initial speed of 25 m/s. It strikes the ground after 1.5 t ; zvh.vz:*2jlana;omz-f j5o(2ttqs. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in npa/ck vs6nemvzq0c 1u 7c p:;/umerical value in the blanks v1nesk0 m7a6zcc c/v /;u:pqp)
(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 wiy,m+d72bof ;2vqzb1+ic2ka kb 8akrm th a speed of 34.7 m/s. (use $g=10 \; m/s^2$, only fill in numerical value in the blank)
(a.) Calculate the time required for the ball to rise to its maximum height.  (数值)  $s$
(b.) Calculate the time for the ball to fall back to the height at which it was hit.  (数值)  $s$
(c.) Calculate the maximum height reached by the ball.  (数值)  $m$
(d.) Calculate the ball's speed 1 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 the velocity at t = 1.0 ss3nw7x 5r0z)ozqw,f a?

  In Fig. below, what is the ve w66ubt.tlb 7ylocity at t = 2.5 s?

  In Fig. below, what ia 9l aq5a+jtt.sa -z)us the velocity at t = 4.0 s?

  In Fig. below, what is the velocitrq4 e.9hs p-ecy at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.0 sj6+g tz8kd lt7r4hg d9?

  In Fig. below, what is the avera/f.)t uwo 93zywmhf6fge velocity from 0 to 6.0 s?

  In Fig. below, what is the acry4zj1 m0g zn dok hw*5n6l6 wwat01(bceleration at 1.0 s?

  In Fig. below, what is the accb)tq3a 1lt5 bee3 0kfzeleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0 s?sj:*p55gn /rks7ufp v

  In Fig. below, what is v.j jbo5u,3qe8jht0wi2n 0yb the average acceleration from 0 to 8.0 s?

  In Fig. below, what is the d4 art77.y/z raph,anu isplacement from 0 to 8.0 s?

Does a car speedometu6 q;25- rw.6 0mapcv nehwnoher measure speed, velocity? {speed|velocity}

  An object can have a varying speed if l7fj0eoh/aj 7 dfy84gits velocity is constant.

  The velocity of an objetv/ tablw 7(buqf ))6xct can be negative when its acceleration is positive.

  If one object has a greater sp9+v7v ijwp w*lm(c9p reed than a second object, the first must have a greater accelrlw 9mp j(i9w*+vp7 cveration.

  Two cars emerge side by side from a tunnedtx l1zn( --s bb)4clal. 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 h n5jarj7ph0y(ts5*f cceleration decreases.

  A baseball player hits a foul ball straight up intci9 ;-iv dw awe+-jfh)o the air. It leaves the bat witwcf; e9 w)v-+hj-diiah 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 itsx jj,uc1;p48w8 jwg ao acceleration, how does it changecwpjw8 x4gj , ja;uo81 if air friction is ignored?

  As a freely falling object speeds up, what is happening to its acceleeba)/q kyzv2f1has1nwqi*yn;r- k e67 vcp 1*ration, how does it change if air friction CAN NOT be ignorn2b1iaq rk/)qf;*esapv1w7 e c1 *h-vkynz6 yed?

  An object that is thrown vertically upward will return to its l nrx b/r7v 90uadv8x(wx2 kp;2i3rakoriginal position with the same speed as it had initially if air resistance is negligible. If air resistance ixux/a8r3;dr lka(ikxv7 p br2v 9w2n0s appreciable, how will this result be altered?

  An object can have zero velocity and n c*a6:7 psv (x.7usinwgtd.fit0tbi(onzero acceleration at the same time.

  An object can have nonzero velocit0 ;omd4 58ypnw sqzg;7cr0p rgy and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making no syt/(a q uujza+7a:7pbtops along the way has zero accelerat( tu 7y uj+z/q7aabpa:ion all the time.

  A rolling ball moves from vqn2 g0b;( dof(tk8ysidt 6t +$x_1=2.3 \mathrm{~cm}$ to $x_2=-5.7 \mathrm{~cm}$ during the time from $t_1=3.0 \mathrm{~s}$ 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 $t_1=-4.0 \mathrm{~s}$ is at $x_1=2.1 \mathrm{~cm}$ and at $t_2=3.7 \mathrm{~s}$ is at $x_2=7.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-miym7 8j l4x8qtvle ($1 \; mile = 1609 \; m$) track in a total time of 6.7 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 lineqiusg/ am)b/)hfa )d;, moving 104 m away in 11.7 s. It then turns abruptly and gallops halfway back inqa )/bdhi)/);mgfau s 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 frzj4: gm2 lxr n2;fn5qeom $13 \; m/s$ to $23 \; m/s$ in 5.8 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 fro3i(1s(vlg0h ojr rt 8b 7qxzb)m $20 \; m/s$ to rest in a distance of 63 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reacyyoq/ ) fj8 ystg/g14jh a speed of $31 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.1 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the ;ri 38f6ihsz4 ztmn9dblocks to essentially top speed abous im9nr4hfdz z 3;i8t6t $10.6 \; m/s$ in the first 11.1 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 unifor hrp.s , :.(tlwv(zt1*dphasfmly from a speed of $19 \; m/s$ to rest in 4.43 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, aomhc 2(v8 tc;i car leaves skid marks 92 m long on the highway. Assuming a deceleration oioh8ct(;2vcm f $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck+g;rsh 4 81gq5 braaqa 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 iaj f1;quv/ jcqgct, 0q,c.-vfn less than 30.0 min. After exactly 27.0 min, there are still 1100 m to goc 1 tc,-q,/g fjf0vcqqa.ujv;. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$