Suppose that an object travels from one point in space to another. Make a com0 ai/ fjkrrt03parison between the disrjfr3a0/ t 0kiplacement and the distance traveled.

  When is the average velocity of an object equal to the instann-(j suh4qt xzr5sm84taneous velocity?

  A new car manufacturer advertises that their car can go "from zlxoc4 )c28nm vl-0bit;n /xipero to sixty in 8 s". This is a description ocibloix0 4n-pn;v cm2/)8 ltxf

  An object moving in the6 byrgxz yk3:2 +x axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car travel1b7o* dz7mi fiing to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleri*m df71i7zb oation.

  Suppose that a car traveling to the West (-x direction) begins to slow downj hj9;vy+3qg s as it approac jgs9q 3hyv+;jhes a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make/ z,uswi0hd4 h18myq/ c-g ril a statement concerning i/ zw g id0rih-4c8squhly,m/1 ts acceleration.

  If the velocity of an object isx .2aszm)a 1bj zero, does it mean that the acceleration is zero? Support your anssxamz a2j) b1.wer with an example.

  Can an object's velocity ch5)uzs8zsw uzr8n 39h lange direction when its acceleration is constant? Support your answer with an ex z)u8rwlhzns35 9 sz8uample.

  Suppose that an object is moving with constant acceleration.k gd;eb6 3yv g- ej;9s4lw5ia/w1 mewh Make a statement concerning its motion with resp h4we3 ma;vyb 5 j;9eglwwidks-ge6 /1ect to time.

  Can an object have increasing widg.m+1x2i yspeed while its acceleration is decreasing? Support your answer with an exampligdm+ y.2x 1iwe.

  Suppose a can, after an initial kick, moves up along n5fcq 75 r( jpnylv86v+t-rcsa smooth hill of ice. Make a statement concerning its 7rq vcs6vy+nncfl5p r8 t(5j -acceleration.

  Under what condition is average velocity equal to the averag*m.lb cetdw +yh.o g2) t6sa1ae of the object's initial and final tsecwhgyt6a *o)..m+l da 12bvelocity?

  Objects A and B both start at rest. They both accele )twus kx:rky4d+y7*erate at the same rate. However, object A accelerates for twice the time*d kyu+ ye):swk7t4rx 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 m1*dico .7wg sk ;he,drate. However, object A accelerates for twice the time as object B. What is the distance ig1hddeo *k7,m; sw .ctraveled by object A compared to that of object B?

  When an object is released from rest and fall3 8endt))hxnl s in the absence of friction, which of the fole) 3nl8t nhdx)lowing is true concerning its motion?

  When an object is released from rest and fao-2plhh4*p k.u eq21ada (k sqlls in the absence of friction, which of the following is2s-u.p q*h2 qplkda (hkeao1 4 true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocity and1l ow1e4.qre p t e.1weqrpo1l4he acceleration when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration jl/ ms,bb3fu.8u t (yxd)mc,c dust before it reac 8 m, bmbu(ydfux3clt,/)c s.dhes its highest point?

  Suppose a ball is thrown straight up7 vy3 eebtd9md j+*uv/, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration aseym9b / t3uded+jvv *7 the ball is going up.

  A ball is thrown straig5hs0(ufbc q6 1b1ssx(rwitt(/f q5njht up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is coming dowsqs11usx / i nj60(f(5q tb5crwb( fthn.

  Suppose a ball is thrown downward in the abyd -w k;( kazh kf5np4-*x:xk9+ix yqgsence of air resistance. Make a statement co(+khxyn 5;yk- wpxqak zf*:d-k9igx 4ncerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her acceleration /piy+uz*ntb z ..d1pcz z 3v3qwhen she she reaches terminalz +qtz.iu p*pzy 31/b3zvnc.d velocity?

  A ball is thrown vertically upward with a speed v. An identical second ball 43afw-ug/-uslr/+ b n-jyna v 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 f/ l ya-+ru- 3f-u/ nj4bswagvnirst ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. 1ih mwi lge* p6tr6.+xOne second later, ball B is dropped from t6x g*e+. rit16wi pmlhhe same building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, ball B j .fr+k( rrbre1 d56ut i+5xq ,8d mo-;gtzigmis dropped from the same building. As time progresses, the difference in their spee ;-x ob,q mr8f+gddzk(5ijeru156.i rrtm +gtds

  Two objects are thrown from the top of a tall building. One is thrown zy g:*ih tfjxj0(.r) rup, and the other is thrown down, both with the same initial speed. What are their speeds when the)g x: fyji(h .jrt*0zry hit the street?

  A brick is dropped from j-zm4vkz+5 cx the top of a building. A second brick is thrown straight d+mxv-kc jz z45own 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 constant non-zero velocity in the +xd;cbd( zxah0 / axis. The position versus time graph of thbaz0/;( d cdxhis object is

  An object is moving with constant non-zero acceleration in the +x axis. The q.drqt(m zm, x4f3.m hposition versus time mf xmd.3rmh tz4(q, .qgraph of this object is

  An object is moving with constant non6 rp 1yr;dt3oj m9u*6viner3m-zero velocity in the +x axis. The velocity versus time graph of this objectoi*du6m t93yrv 6 pe1r; 3mnrj is

  An object is moving with constant non-zero acceleration in the +x a1 /b9-vanc1t4mj civwxis. The velocity versus time gra/j4-mv91 tvbn1c awicph of this object is

  The slope of a position versus (gs 62gu hm4uxd/m 0cltime graph gives

  The slope of a velocity versus tyw +a :qror6 n -l3rbt+qz-*qvqg m*v;ime graph gives

  The area under a curve in an acrj(dy z k 5baw878yrf78 p4zikceleration versus time graph gives

  The area under a curve in a veloc21a*vtulm yj2ibl)+w b*3* mear bjq /ity versus time graph gives

  If the position versus time graph of an object is a horizontal line, the objec,aur75 u1ju pdt isaur uu ,7j51dp

  If the position versus time ge*. 5makc8gonraph of an object is a vertical line, the object is k8e*c. maong5

  If the velocity versus time gt5dk-p1b hu 6qraph of an object is a horizontal line, the object is td5u6 pb1h-kq

  If the velocity versus time graph of an object is a straight line n10 nc97 ysqntmaking an angle of 30 degrees w9sy17tc nqnn0 ith the time axis, the object is

  An object moves 15.0 m north and then 1w2 4q)dlf,jqp(j qo2o1.0 m south. Find both the distance traveled and the magnij2p,dq4ooq)(qj 2f lwtude of the displacement vector.

  A boat can move at 30 km/h in still water. bor k0b;gdq7 ;How long will it take to move 12 km upstream in a river flowing 6.0 km/h0b kbr7dgqo;;?

  55 mi/h is how many m/s? (1 mi = 1609 m)l7lc en.bpwsv2tt8p7bvj ,y +50k,cr

  What must be your average speed in ot,wn,2ok/s.2 fkxs.tex 0qd order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.-9usith a;8f au 7slzd4bof)3 0 km) in 2 hours and 57 min. What is the averagdu9fulzs4ai-a 8t7bs 3h; of) e speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel 404c p3gmikr mmux3 ;;:xlh7-fb0 km?

  A ly (light year) is the distance that light travels in one year. T,d-jucvz,n6 .g;afv wte( wg ,he speed of l6vwg ,ut ,ag(nevczjfd -w. ;,ight 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 alku2.yzl,23 ux,gl y3a qwhj4bo *utl7ong a straight road and you look to the side for 4.0 s, how far do you travel duri47 2u2 tjql l.gzbwa k,o3y u*h3x,luyng this inattentive period?

  If you run a complete loop aroun ;3kawu r1i4kzd an outdoor track (400 m), in 100 s, your average vkz;ua34k w1irelocity is

  A polar bear starts at the North Pole. I,iasbkj/kn l.n *3 wr,es/i2d5gk:au t 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 4l,jkwes u:5g/ird,a 3ibk*/2 n an.sk5 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It trave o spb/bxxjvys24 x j9sm*z436ls 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its vp jsbz/m*b63 jyx4s sox 2x94starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at 558 -zmbs*iqs xznbt +b*pdd006 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after drb qsmp0 8bb*ndst* izd-x0z6 +iving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h wrxewbb7(sr7 i8gag+ 3,r3ml. What is the average speed of the motorist for this trip a 3 wixbrrs,bw38gmlre7 g7(+?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 krrfm /rr0ra ;4m/h. What is her average speed for t rfmra0/rrr4 ;he trip?

  An airplane travels at 300 mi/2b3*vxs * t f86ec(equax+ qdst8k2rdh south for 2.00 h and then at 250 mi/h north for 75erqb c2sq * 3tduxxks(8v2 6ad+te8f *0 miles. What is the average speed for the trip?

  In a 400-m relay race the anb(k q0q ikmite8,9c 6fchorman (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 l9qi, femciq (bk8t6k0ead 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 uniformjcowhm6u s :0ew56 xa 8q88bkxy6am o-ly and comes to a stop after 10 s. The car's average velocity during deceleration was 40 km/h. What was the car's deceleration whio a6w6 q 0-aw5sjo:hxm8u m68kxyb 8ecle slowing down?

  An airplane increases its speed from 100 m/s to 160 5h oq+3boz3zyok0ba p;iix0+ m/s, at the average rate of oo+ 3bq;ip 0izyxh 5z0 obak3+$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/hh v/g2+*kq3mu iw mmx- 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 accelerates a 962foy/h y2rk r7am,,f h3fpuvfe5u wt $4.0 \; m/s^2$ 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 thelj3 0ar:tr *akn speeds up with a constant acceleration otrkl:*30 j raaf $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 5.8 m/s experiences 55(-y, xeq01cjzbro ny mv ew4a constant acceleration o x,1jye(n5vz-y cbm 0qre o54wf $3.6 \; m/s^2$. What is the cart's displacement during the first 5.2 s of its motion?

  A bullet moving horizontally to the right ,s ssu5aq/.bs(+x direction) with a speed of 440 m/s strikes a sandbag and penetrates a distance auq/,b .sss s5of 74.79 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an kkz8ah 1vg y)gc p b5eqi 4g(eo-/2mr:aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constagkiyg 8 bcq-)gh42a 1r:p(emo 5z/kv ent, what is the length of the catapult?

  A car starting from rest moves with constant accelera/ims 7 nuk4rq876aenkfl5) xt vez7 s6tion 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 200x9c j-2*zfp uu76es4w5my(kpka9b if m. What is its average accele*a uiucp5kf ybzpk(x 6mw992 j- 47sefration?

  An object starts from rest and undergoes uniform acceleration. During the first1rgwud c) +a6vsxwkpkr :95 x* second it travels 3.3 m. wrdsa6r x1kw)cu kp *v5+9:gxHow far will it travel during the third second?

  An object is moving in a straiq84l oru q0g s3 lu4bpo+41rqaght line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this tilug o04q o3b4aq8r 4r1lsq pu+me?

  A car starts from rest and accelerates uniformly u98 q)dodo6.nd;o ue nat $3.0 \; m/s^2$. 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 -7j h +izypp dtqz4::yg6t 3vwdry 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 light turns green, a car that has been w vymcht)-*8 qeaiting at the intersection starts ahead with a constant acceleramtq-c*hev) y8 tion 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 planet sk/+b mh,h r*:666 betoos svrX where the acceleo6rr s*ov hes,sth:b+b/6km6ration 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/v2coso2 oik* .s on the surface of planet X where the acceleration due to .o *osko2ic2v gravity is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upward with a speed of 15 m/s on the surface of pl vu* ide 7p+sdrc*m2ku.pm 6)zdpdo40anet X where the accele mzo7)ue2 pdmd ** 0dp4ukscd.vi6+rpration due to gravity is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

  An object is thrown upward wit7;athe3hj a 46ul vhv;h a speed of 14 m/s on the surface of planet X whe;46; a3h7vjeu tvah hlre 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 u).53bjbzrptuv x9xh/sually greater than 0.10 s. If your friend holds a ruler between your.p vxzb)u xt 93jb/5hr fingers and releases it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity j3:o0 t.di7fb + bjinxgb*1peafter 3.00 b i7b*gj tfodn310ebxij :+.ps?

  A bullet shot straight2+ewy 1z3ghnb)yoku-mk.p/ e up returns to its starting point in 6 s. What is the initial-bnymwk) 1/ekye h z+o2 3.gpu speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does i :3zgnni nr mgm79b/p0t take to return to its stp m7n i0ng:r /gnz9m3barting point?

  A ball is thrown downward from the top of a building with ajb7osf+w7 /hf bn8 0of1p w(d1 otmvy(n initial speed of 25 m/s. It strikes the ground after 5.5 s. How high is t n (hty1fw1+ofbfv 7po0sd7o j8b(/ mwhe building?

  A ball is thrown straight h,2ri6noamu, dzn/ k8z +*bpy14ivli up with a speed of 30 m/s. (only fill in numerical value npa,ymv, b/r o*inizz k8+24i1 udh6lin the 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 with a speed of hmog c/ /.9d(dq n)jopkn*uo4 45.6 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 6 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 6.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = k g riec8;rb 8p *4f 1pn0-29yfn.w.osgdplvo1.0 s?

  In Fig. below, what is the veloc3a s32dkni2uv ow ;6ikity at t = 2.5 s?

  In Fig. below, what is the vuz8 r1mqkr4.g je mm--elocity at t = 4.0 s?

  In Fig. below, what is the v)ukwv9wku;lbie;f-;(6 3a l7jn fhp nelocity at t = 5.5 s?

  In Fig. below, what is the average velocity fro9zq:j ea am-r28w9 x ev,ts4sem 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6.0 1x+-gkdi wm,2 nm1i ids?

  In Fig. below, what is the accneid08l*o.l a /z/jb8 tiuh w 0bxbv98eleration at 1.0 s?

  In Fig. below, what is the acceleration at 3.0 -m4h,xqx cfr0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0 srf:zw z 6pdm-)zepu .go7xat4 mku02.?

  In Fig. below, what is the average acceleration from 0 t1ov+jg hq4 n1thm,-x jo 8.0 s?

  In Fig. below, what is the disploh1a/nysb9wlx rz n,kdp2w 7kr mdpl85 y8.+5acement from 0 to 8.0 s?

Does a car speedometer measure 7q tnayv qlaf 65vt,lge3a9rw2eklcb 3:/k66speed, velocity? {speed|velocity}

  An object can have a varying speed if its ;xi f rd(-+4 3obpvajzvelocity is constant.

  The velocity of an object can be negative when itc. 82 cvrj/os4ar8hfws acceleration is positive.

  If one object has a greater speed than a second object, the first mus202 ,yhlpkyfo4x4ni a t have a grea 2o02ya44,nkxhfpiyl ter acceleration.

  Two cars emerge side by side from a tunnel. Car ct ,srv q:71;03fhx(xfz keknA 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 acceleration decrea c.hg8u)y4e ndwi8d/ mses.

  A baseball player hits a foul bak zh.c8(wiqky p )j g1g.p(7iqll straight up into the air. It leaves the bat with a speedjp zik q.p1. h8wy(k7i ggq)c( 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 isl (ctxt t2:.tb happening to its acceleration, how does it change if air frict2lttct.t x b(:ion is ignored?

  As a freely falling object speeds ja5b 6 aepjmoez8):33xyy.(;u ehegjup, what is happening to its acceleration, how does it chh;.y )b 3z uxj(5 je6eg3a:maop8yeje ange if air friction CAN NOT be ignored?

  An object that is thrown ver1aiqk2 p 1a4gptically upward will return to its original position with the same speed as it had initially if air resistance is negligible. Ik4 gp12paai 1qf air resistance is appreciable, how will this result be altered?

  An object can have zero vebah m.7m9(hw zlocity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the sa2 n mbbrp-i,rr3c0s8nme time.

  An elevator moving from t-hu-jedi 1jr 61zt+:mbc w +eehe second floor to the fifth floor making no stops along the way has zditj1- b-eu+6 :m+1crewezj hero acceleration all the time.

  A rolling ball moves frj-3nvyqhj +j4 +hpm3qx9w 2kd om $x_1=1.8 \mathrm{~cm}$ to $x_2=-8.4 \mathrm{~cm}$ during the time from $t_1=1.1 \mathrm{~s}$ 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 $t_1=-4.1 \mathrm{~s}$ is at $x_1=2.4 \mathrm{~cm}$ and at $t_2=3.0 \mathrm{~s}$ is at $x_2=7.8 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight cgapjlfvb7paq.,) 908m. n qpo omplete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 9.2 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its tra v*3 -kmjtxqea:dt1y/ iner in a straight line, moving 87 m away in 8.1 s. It then turns abruptly an*vd akt-qymte/: 3 x1jd gallops halfway 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 froquz*i8osf, c56kl 8a,b ;w tfbm $11 \; m/s$ to $23 \; m/s$ in 4.8 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 frows2j9o )x.cynw 6kzc;o-a tu 2m $19 \; m/s$ to rest in a distance of 79 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must re,dw zr;bwcw7t *g br+5ach a speed of $33 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.8 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter ey/joldpr:b2s tol.ab 0)w0;can burst out of the blocks to essentially top speed about ty0wrl as /jb2;blo 0.o p:)de$11.0 \; m/s$ in the first 13.5 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 us*2w3gtw.*7o tt b:ao 5clsva speed of $17 \; m/s$ to rest in 4.93 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. Assuming 7zqck rrchze uw6-nwx.5;/4 ta decelerch wtcr4 76kz;q/.e5 rzwx n-uation of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trdz; da;vq d)e+uck 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 10,0z ilfvnu4 -3ig 0-6env00-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must ti04-v uf nle3 ni-vg6zhen accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$