Suppose that an object travels from one point in space to af;izx 75c/p 0mi edc*dnother. Make a comparison between the displaczccdmp0fexi 5i;*/ d7ement and the distance traveled.

  When is the average velocity of an object equal to txcq lbndh*, w29;*x jvhe instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty inq.wutuo 7*+6kyx wnv* 8 6.un wtyo +k7 v*uq*wxs". This is a description of

  An object moving in the +x axis 6z4a*ts y2ps0c)3 f rc6vl qbcje329nw do- fcexperiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow down as 7 t5r q76sesqnit approaches a traffic light. Make a statement conce5sns 7tqqr76erning its acceleration.

  Suppose that a car traveling to thzc bwsqo2v y2ml;ac.s, +6v4 je West (-x direction) begins to slow down as it approaches a tcs+msbajw;. vy4o22l 6c qv z,raffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity( ux6nd,z2(zx vih * xgk)wof.. Make a statement concerning its accelera xvix(.2 6,(h wu dofnzg*k)zxtion.

  If the velocity of an object is zero, does it mean that the acceleration isdw tkk*y0v h)m:kg8 5j zero? Support your answehd0jkm :)*wtvg8y5k k r with an example.

  Can an object's velocity change dira12-q vrj. l)um uway5ection when its acceleration is constant? Support your answer with an exampla2r)wv.l1u5u mq yaj -e.

  Suppose that an object is moving with constant acceleration. Make a statemenuq)qkv s94 9mnt concerning its motioq nvkm)u9s 4q9n with respect to time.

  Can an object have increasing spee;+jjpr inp, )ji)rm)j d while its acceleration is decreasing? Support yourj)jmp,nj;p+)ji ir) r answer with an example.

  Suppose a can, after an initialhp2y /ov8w2qij o(dk4 wyw /f3 kick, moves up along a smooth hill of ice. Make a stok(qhj4y/wp wyf o/8v23i2d watement concerning its acceleration.

  Under what condition is seo2egej2yy/7u 9 lwb 0:ct:b4t *czyaverage velocity equal to the average of the object's initial and final velocitybwbsu42j2c9 tz :/ytye y o*e0e:c7gl?

  Objects A and B both start a;ojrs+xk1:qgnfpy-4/zn , h ct rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to thah 4x ,k; ysjozqngf:pr+c-n/ 1t of object B?

  Objects A and B both start from rest. They both accelerate at the same rate. 0mh7o go-7;njkwpjg: However, j7go pw gkn0h7-o;m: jobject A 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 releaswaczs 3k /l07-,rb+b ky c*wfzk,d 3vced from rest and falls in the absence of friction, which of the following is true concerni+az3*k,kf l ywc3wd7v0/cbs z, cr-bkng its motion?

  When an object is released from rest and falls in thee/)w , 5amvc3wufc ;wt absence of friction, which of the following is true cv 3uw ctfaew/,w);mc 5oncerning its motion?

  Suppose a ball is thrown straight up. Make a srshr 9z: + lx+g0khnu/tatement about the velocity and the acceleration when the ball reaches th l:ns9g/h rzxr+kuh +0e highest point.

  Suppose a ball is thrown straight up. What is its acceleration just before it kvjt a -bhh5)f*kzzw 1tqg y9z p)53i9reaches itak p-tzfqzh3kjt iw)9z*9h 5)b5 g1vys highest point?

  Suppose a ball is thrown straight up, reaches a maximum height, thum,cf6ne/-; w1ez t 01iio c2va ard)fen falls to its initial height. Make a statement abo v2 ez0itif - ,ae6do);c/wurnf1ac1 mut the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum heighfl;cfdi q/ :e.t, then falls to its initial heightf e;fci/q.:ld. Make a statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown dowhs1p*3jm :skb nward in the absence of air resistance. Make a statement concer hjm*s k1:ps3bning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her accelerationu3z/nt120fhapnvrm 46ogg4xfa: iw * when she she reaches term nw4 6go*ath2gpnf zxm0 fu/r4aiv1:3inal velocity?

  A ball is thrown vertically upward with a speed v. An identical second s 7)7uye txys-ball is th-txusey )77s yrown 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 ball go than the first ball?)

  Ball A is dropped from the top of a building. One second later, bm+jyn8 fghvtdu 2(3baims h g(yn.w5q;a;4z( all B is dropped from the same building. As time progresses, the distance s;hj2uyn b(am 4 58tdz gh.3qw+y(( vimafgn;between them

  Ball A is dropped from the topdhd4i,6 rot ezur1n28 of a building. One second later, ball B is dropped from the same building. As ti8n ,re1 iht dzru42do6me progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. Onw)sko:ovn46-hg wjv 6bm;s3 ue is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit the str6us v)m 64 ;n-:wvogk bshowj3eet?

  A brick is dropped from the top x fe )to0 e*myo,i(ig,of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resista ( xi,f)tgye0,* oiomence. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero veqic7.hu0s6eb 4ua 5 prlocity in the +x axis. The position sr5ua ubcpi 4eq6h0.7versus time graph of this object is

  An object is moving with constant1 y( kqchlff,9 non-zero acceleration in the +x axis. The position versus time kfy hq(9l c1f,graph of this object is

  An object is moving with constant non-zero velocity in the +xl +-v1e+nfsn(yw6 dbt axis. The velocity versus time graph of tte+(l w-6vfnyb1+ ndshis object is

  An object is moving with constant n//hv-- qntjeqg q5v /ron-zero acceleration in the +x axis. The velocity versus time graph otq vg rjq/n/v ehq--5/f this object is

  The slope of a position versuoeut2.+q3 0: s.fl l jol9nphqs time graph gives

  The slope of a velocity versus time gra+25 :z5i;mu fswfek y+:jljavrp-8jpph gives

  The area under a curve3cu:o gri*e +z in an acceleration versus time graph gives

  The area under a curve(xll2ge- f*d c t.mc*u in a velocity versus time graph gives

  If the position versus time graph of an object is a horizontal line, the w8/ dyovplg5; 3 wehu.object . 5o g;dluv3wwpeyh8/is

  If the position versus time graph of an object is a vertical *arwuq.tafh3/z+ft/vg: b 1 -vecuh *line, the object ish1 rea-*utv/a. t/+3:f hugbvfqw z*c

  If the velocity versus time graph of an object is a horizontal line, w+10 pn3p lyy mk34x,xz sgg-h;*gnvzthe object iy*zzv01hnpn-;k4 m, yxg3 pgsgl+ x w3s

  If the velocity versus time graph of an object ism x5k (ofe931keb0pth a straight line making an angle of 30 degrees with the tx1eebf( hp m3ko5k 0t9ime axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distance:0bjcb;3y2;;yktz sgyksx.e traveled and the magnitude of the displac:y yesk.k;bz t032b gcjy;xs;ement vector.

  A boat can move at 30 km/h in still water.uga-+2w*dg mh;c 0 oxh wp;t7n How long will it take to move 12 km upstream in a river flowing 6.0 km/coxw07hu-hw*gagd p;+nm;t 2h?

  55 mi/h is how many m/s? (ux1d9 kz c.*nz1 mi = 1609 m)

  What must be your averal9ibmfdu-0 jgt-2 v8 jge speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximat: 5ra aex:f-awely 42.0 km) in 2 hours and 57 min. What is the average speee x:5wa:rfaa-d of the runner in m/s?

  A car travels 90 km/h. How long does it take fcpw a ,qh-o4na;.mf3mgh f( v1q;;qc qor it to travel 400 km?

  A ly (light year) isb2w6n:u0 b1lx ac ajxv7 1bthqk 9/3kv the distance that light travels in one year. The speed of lighk a0bk1 vln17a 9ctv:2w3u/ bxjhxb 6qt 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 side for img7(1.dyqb krp27 z s4.0 s, how far do you travel during this inattentive pk2byqpi.r1m7ds z( 7geriod?

  If you run a complete loop around an outdoor track (40f)ktyar7p(b.n5ak 7 x0 m), in 100 s, your average velocit75 na7ypk .r()xa kbtfy is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km ea.3b*y rve+o 6g,w1edp/q:qy vz u awn:st, then 1.0 km north, thene: vq*ouwype gb v31,6a:nw/rq d+.zy 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 km sh :)/;)gpiobrpo )pay outh, then 1.0 km east, then 1.0 km north, then 1.0 km westob:;h/pop )gapyi r )) to return to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekebzo 8dgs at0y f*5+bj0nd from school at 55 mi/h for 110 miles. It then starts tbbdo5fstaz0+8gyj 0* o snow 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 km at 80 km/h and 160 km at 100 km/h. What isavh p-t* o 0gz1aiv-;z the averagzaio p;1zv- tah v-g*0e speed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. Wrc3.l -woa 9 efposo86hat is her averag9rfoo3sc68.op- aewle speed for the trip?

  An airplane travels at 300 mibscfc2,jt+s 4 /h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average sc s2j ,bts+cf4peed for the trip?

  In a 400-m relay race the anchorman (the p+v) nq w;jw-x9m, eqxwerson 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 thxwjq)-vq9wnm w , ex+;e team A runner starts the final leg of the race, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop after 13 srru2 :rp+b)g vp,+r lqzr o9g-. The car's average velocity during deceleration was 74 km/h. What was the car's deceleration wu+g , z- )rb:p+rgr9pvlo2 qrrhile slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average rat*c r, aqqb5vlgu4+ip,u*0 dic,o q;be e of u priuc5b+ed0ac, lqg,o*ib*, q ;v4q$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acceleratw-6 wnh9 kz4 1wyo+doyes 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 anbl aqh-3 fmagx q6* 3t19n7flld 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. It then speeds up with a constant a57gs2 2 13*.wfmeikbn ameinw cceleration of 32e naw*iignewk b 1m7f s52.m$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 7.4 m/s expotu feu gd1fgddsx/h(,)8 si:/ik :5periences a constant acceleration of fs,/ed8s): (idh 1po:uk5 g/dxiuf gt $2.8 \; m/s^2$. What is the cart's displacement during the first 5.0 s of its motion?

  A bullet moving horizontally to the righ atrx+evhf1f( fas08 -s7qvw) t (+x direction) with a speed of 479 m/s strikes a sandbagxsf 0)v(feqha8 -at1fs vrw7+ and penetrates a distance of 32.39 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is lap 7k3csg. ko+yunched from a catapult on an aircraft carrier. It reac3pgs c.o+yk7k hes a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant acceleration s92f fqs07qbmof $2.0 \; m/s^2$ 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/s1;e+u6 :wu 9qefhpef o to 80 m/s in a distance of 200 m. What is its average accelp;e e6+1qf:fuw h9ueoeration?

  An object starts from rest and undk+qld6;s 2e-8d2sl9yq hg3 nji0 s bgiergoes uniform acceleration. During the first second it travels 1.8 m. How far will ieilq3l-yd i s620gdh;k q9bsn 28j+gst travel during the third second?

  An object is moving in a straight line with constant acceleration. Initially it.jv/n vi /f6yx is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far dv6/vj/ifyn . xoes it move during this time?

  A car starts from rest and accelerates uniforhyy lt ;2s,f0a+o1hxc mly 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 dv1m biw qyay:gp*5)tszl (d.d,r2:u l ecelerate 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 tueq:.7shq nd* wrns green, a car that has been waiting at the intersection sdeh7 .qwnqs*:tarts 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/s on the surface og 4a 4c 7grmxw*uax:c6f planet X where the aw c74xcm*auga 6rg4:xcceleration 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 thhe 7(c nzu,jq8e surface of planet X where the acceleration j,nhuz7e8cq(due 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 of 15 m/s on the surface of planuu2ccrp5 4 7i0kr0dktet X where the aikc7pr4uk5tc r20u0 dcceleration 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 with a speed of 14 m/8udr e/u9d68k0,bb ic 7e ktvzp)o6 wps on the surface of planet X where the acceleration6w)v,ct7u8ue/0z b k96ikp d p8debro 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 ,2i ( nj0jcbs/zxqszu0n, 3cathan 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fa2x,(j,z3 a /0qnn0b ziucsjcs ll before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity after u8e3m9upj 82 ) hmmsgt3.0eh)j 8u2p8mt9ugm 3m s0 s?

  A bullet shot straig 59s 2 xy*s q,bjjtrn1c*4optkht up returns to its starting point in 12 s. What is the initial speed of the 1xykp t4r*cs*bqj, st92jo5nbullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does iu -z*6)ifr;ol 3qc sdot4c7o wt take to retz 64oq ;)3ious rwtccl*d 7of-urn to its starting point?

  A ball is thrown downward from the top of a building5mrdv35tzsllqd4d8 : n/p+wo with an initial speed of 22 m/s. It strikl wl83n5z:vrp o/5+qd m dstd4es the ground after 7.0 s. How high is the building?

  A ball is thrown straight up with/ unopdd82:07bq g+ enh(xr vz a speed of 30 m/s. (only fill in numerical value in bg2z 7n+o/v:h prxn8ud(de q0 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 stdufm8bz4) tc8r,tep4 :6en lk raight up into the air with a speed of 31.3 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 5 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 5.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the vjai4(wa) a))h39nvkzfuy wltv svb.q u+13x9elocity at t = 1.0 s?

  In Fig. below, what is the velocity at tv b: tj.9jgb+8skh -zi = 2.5 s?

  In Fig. below, what is the velocity a )i((80a mkjv:oxx md6wv-ndvlg)si7 t t = 4.0 s?

  In Fig. below, what is the velocity u ffo1jd m-ff3z-r.w5at t = 5.5 s?

  In Fig. below, what isv wawpk0u8u-3 the average velocity from 0 to 4.0 s?

  In Fig. below, what is the avera6twzthg 0efq +*afk-/ge velocity from 0 to 6.0 s?

  In Fig. below, what is the acc*ja0(6-fjur9r cp06nc+1pvc olhk eseleration at 1.0 s?

  In Fig. below, what is the accel+8pfy8 .r/m itoks k)9n:gj:oq pnli(eration at 3.0 s?

  In Fig. below, what is trcasgf+jsfydy 9 :)u8v e.p /2he average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average .g(o paob1)6q x)lcp+(bjvyne e- w+pacceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 *t1gg u6d0t wtrd 14uc8iwf5pdot)2 bto 8.0 s?

Does a car speedometer measure speed, ver 5l*/:p6 chmuxmmxns4 q2c ed8:4uoqlocity? {speed|velocity}

  An object can have a lsfd 5y0+eo51ybb g8rvarying speed if its velocity is constant.

  The velocity of an objec6c4 y8ok.h0aoz4- prpppd +ext can be negative when its acceleration is positive.

  If one object has a greater speed than a second object, the first must hawy(*( 0s jjfwo0 ycf9ove a greater acceleratiojfcys(w f0y*o o( 0w9jn.

  Two cars emerge side by side from a tunnel. Car A is twyfx huz.(x5ddm c o9*v-en))raveling 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 acceleration6*ehu ( /ra7ngrtwc9 b decreases.

  A baseball player hits a foul ball straight uh3+* l, :yhghaaxfiw- p into the air. It leaves the bat wi,-3x*l i a:w+ hhahfygth 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 ,m yi m8nynt8/object speeds up, what is happening to its acceleration, how does it cn8tn8m/m ,iy yhange if air friction is ignored?

  As a freely falling object speeds up, what is happening to its acceleration, u/ - (ab;jqgdkz+ zyu;how does it change if airq; /k(+jdua yzu;z-bg friction CAN NOT be ignored?

  An object that is thrown vertica-i7)+-3xhg;svu o2 bmghq r-z yy8wfxlly upward will return to its original position with the same speed as it had initially if airg2ywzs -hx-omgb+8hv- u r )3xq ;fyi7 resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at the same ti ynv0-e vq0ip4. v9;afudai +ame.

  An object can have nonzero velocity and zero acceleration at t(wn,rhtb )rx*ha*xh -v m;k+rhe same time.

  An elevator moving from the second floor to the fifth floor making no l pao2p,(,tbkrqz96 ostops along the wakl art,oq2p ( 6z,9pboy has zero acceleration all the time.

  A rolling ball moves fe pg6zvxywobw1k b-7 a(p ,:kvx17,g,bu;befrom $x_1=3.2 \mathrm{~cm}$ to $x_2=-8.0 \mathrm{~cm}$ during the time from $t_1=1.3 \mathrm{~s}$ to $t_2=5.3 \mathrm{~s}$. 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 $x_1=2.1 \mathrm{~cm}$ and at $t_2=4.3 \mathrm{~s}$ is at $x_2=8.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-mileu( y /cqn3cbnzk7)8 rh ($1 \; mile = 1609 \; m$) 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 line, moving 87 m away in 11h. m3hn7oh6f, ilkp4pl vr: v;.9 s. It then turns abruptly and gallops halfway h4p;lonh 7viflkr3v.p hm:6, 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 fronhni-mge(* k 4m $12 \; m/s$ 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 -sy z/kmil 0fn* s8-v9x gteo/$22 \; m/s$ to rest in a distance of 68 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a sp(lsapbfq0kj, 6 r.ow2k6mr1d u6xq /yeed of $30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.3 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burstzd*t-se3tcm : out of the blocks to essentially top speed aboutc :m-3zes td*t $10.4 \; m/s$ in the first 13.1 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 unif*g x;qhnhiq;sav7zb7p 2y b 44ormly from a speed of $16 \; m/s$ to rest in 5.55 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92zw 4niye 4 m0e-r 4afroi4(s-h m long on the highway. Assuming a 4(4r4efnsmeo4w hy-z0-ariideceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truckplx y f)9p2b*c 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).    $m$