Suppose that an object travels from one point in space to anotheur.rqo7kc,t+e:pa7 dg4r2 xm r. Make a comparison between the displacement and thqoekp:a+r tr.x42udg c, 7m7 re distance traveled.

  When is the average velocity of an object equal to the instantaneous veloemdr+pny ,si:6a0 0xmcity?

  A new car manufacturer advertises that their car can go "frotm/l9fqnsfn ).4xqz8qn,.) uxa y4bb m zero to sixty in 8 s". This is a description of)m.xysq,t89fz qx4 /na4n )u. bbfqln

  An object moving in the +x axis experiences an acceleramqu : 33v5uhlz+; pvcjtion of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the Etivr))e2+ e-8ufw i 8s-cn uaaast (+x direction) begins to slow down as it approaches a traffic light. Make a s)fw+veie ci)8u 2r-t anu-8astatement concerning its acceleration.

  Suppose that a car traveling toxfx*a9-(9 exujrn (ky the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement cur*9-k xjf9 xe(xa(ynoncerning its acceleration.

  Suppose that an object is moving / dna)*kceuv:with a constant velocity. Make a statement concerning its accelerationcak: du v)n/e*.

  If the velocity of an objehp+62u:xmtl8h h- u qjct is zero, does it mean that the acceleration is zero?+2 m8qu-hhpu hx6lj:t Support your answer with an example.

  Can an object's velocity change direced+c2.ew6kuo tion when its acceleration is constant? Support youu +ed6k.cweo2r answer with an example.

  Suppose that an object is moving with constant acceleration. Make a st;ndnkzg* 8o wo71.yss atement concerning its moo s;k*z1yso.g n8n7dwtion with respect to time.

  Can an object have increasing speed while its acceleration is decreasing? Suppm4u s);0w-r 6divpf8xeo(f lzl 4lw i/ort your answer with an ex4(v)w0lfwm f6x z-li;8ru/o4pe isdlample.

  Suppose a can, after an initial kick,s v0z y bwv grcd7nkf38,h-m-5 moves up along a smooth hill of ice. Make0f --3 s,cg5nhrkw m zyd8vv7b a statement concerning its acceleration.

  Under what condition is average velocity equal to the average of th0f j4r*blf+7cudb*iw o (un6ge object's initial and final velocd04ngw6b7b ur *o+l ufci( fj*ity?

  Objects A and B both start at rest. They both 0azf xo n:xwf 8qdb51a) v7m7nq-ku)saccelerate 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 thbxs7 qmdufx:wa 78)1)az-v f50nqko nat of object B?

  Objects A and B both start from rest. They bo1+w -xp rs)mqoth accelerate at the same rate. However,m)r- x o1wp+sq object 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 released from r0:dhy ryijew7l-v l1*p1.vxs est and falls in the absence of friction, which of the following is true concernvx1yjpi-wl.1l7 yh0s*d:evr ing its motion?

  When an object is releaaq(bmui : 50vjsed from rest and falls in the absence of friction, which of the following is tru(v: mia0jbq 5ue concerning its motion?

  Suppose a ball is thrown straight up. Make a stateme2j8n9rvd wi88z ;upz t2a.lscnt about the velocity and the acceleration when the bu;.rdwn2acp 89 jzvs8l8i t z2all reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceler*jk q(stxp)xe-g2-phk (; s bration just before it reaches its highest poiq g*b2xrhs jtke--p pxs;k()(nt?

  Suppose a ball is thrown straism186ls9 bfaqght up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the ve mf91l8asbsq6 locity and acceleration as the ball is going up.

  A ball is thrown str+yo4 ;t3nlyi maight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the vellni4+y t y3mo;ocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. M5/pvscy76eh4bn 5 rrfake a statement concerning its accelerasr5nf 6 rpvh b/e45y7ction.

  Suppose a skydiver jumps from aie/swgis*+q rxsh 8- c+5s e(0sr(wad high-flying plane. What is her acceleration when she she rea -(w rcgi0eas x8(ss+i5s/ qrhsd +ew*ches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical second ball isoc f rc(t2ia2 r 7f-wdjrc:9q* thrown upward w a9qc( t jrcio22cd-7*:wfrrfith 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 o;0 us5: akqo61bc xfeyf a building. One second later, ball B is dropped from the same building. As time progsk ca:1ye6 ;x u0oqb5fresses, the distance between them

  Ball A is dropped from the top of 2 x)(bzib 73lvbt;ujh pm7e9 ea building. One second later, ball B is dropped from the same building. As time progress3e et v72bh x9b7p;izljbum)( es, the difference in their speeds

  Two objects are thrown from the top of a tall building. myc0oqv 2nr(+ One is thrown up, and the other is thrown down, both with the same initial speed. What are thei om2vyc 0n+qr(r speeds when they hit the street?

  A brick is dropped from the top of a buildi1jqc vi6nmz /f6c3hx 2ng. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resi h6zcvxfnjc/i6mq1 23stance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero vel yn)w0m y,jhmddbhp2f6t240x h m01n rocity in the +x axis. The position versus time01mmyj2ym6 fxh,rd)hn 2bpn40d wht 0 graph of this object is

  An object is moving with constant non-zero accelerati,z 3qax e+wih t,w:sr(on in the +x axis. The position versus time graph of this object ix(r hz3wq: sta+,,ew is

  An object is moving with constant non-zero velocity in the +x axo yv zk5 wol:0d+gv3c5is. The velocity versus time graph dozy530:5v cgv + olkwof this object is

  An object is moving with constant non-zero acceleration in the +x axis.k8pubxzhd9n n5 82g3v The veloci bp x8n3v9ukn85d z2hgty versus time graph of this object is

  The slope of a position versus time graphcc8zcr/q)/wm ;j z0)xki)ex j5 a,acm gives

  The slope of a velocity3x4 ;( nm0/*n jprmsvfi*wqygjbae 6 9 versus time graph gives

  The area under a curve in an acceleration versus time3)a 3jan ): -edkbgnpxh2wpu: graph gives

  The area under a curv)znf*rq1xt5tab8 t( tk8hukfpy 3 y /.e in a velocity versus time graph gives

  If the position versus time graph of an object is a horiz 3 eo4qc.w)q:zd 4bfbcontal line, the object iqw 3bqe:)z44c.fbd cos

  If the position versus time graph of an object is a vertical line,dh7v85 our rh, the object is, 7o 8rhuvh5dr

  If the velocity versus time graph of an object is a horizontal line, 4:6 g,par q9hoq7bjgx5grc-rkk55r j) q) v vqthe object i5jv4:q) rgxo -6q pg q7 )hvbrcj59qg, ra5kkrs

  If the velocity versus time graph of an object is a straight line making an ay6(a. h1 5kxrz0jdenjngle of 30 degrees with the tim61( j. dxn0kj hrayze5e axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distanc7x h*czgxso+ 4 :hp3 (z/ gyfobk.ah4ae traveled and the magnitude of the f+a 4xa3* hgsbhh xg(k .4c oypz:oz/7displacement vector.

  A boat can move at 30 km/h in still water. How long w +umqb 9ops2ex*3n/ o0qq lz1i-2ih0yx qmzs5ill it take to move 12 km upstream in a river flowing 6.0 p hq2yiun9ozxme3+q1 m b*q 0 is502sxo/zlq-km/h?

  55 mi/h is how many m/s? (1 mi = 1609 yitp8*3xlm mxcw y+).m)

  What must be your average speed in ord ++/x(by1baqy(k:c 9kdbyec5b x uni4er to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42e3w7l mxpw. 3 z80/xlnux:qxd.0 km) in 2 hours and 57 min. What is the average speed of the runnerx /.wl pxe7x3mul0:nz8qdxw3 in m/s?

  A car travels 90 km/h.yk82z (mnsyj1 How long does it take for it to travel 400 km?

  A ly (light year) is the wpg v (s1/ j/mvu1pyh6y4dzj4distance that light travels in one year. The speed of light i/ udjsjy6ph(m pg/1z4 vwy4v1s $3.00 \times 10^8 \; m/s$. 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 roac0l * ty2 fusczulgg /nsl7;i23 srtr/s8(,pad and you look to the side for 4.0 s, how far do you travel during this sgr r*,3t;uif(t8g0 cp7y2zl//asu2 l nclss inattentive period?

  If you run a complete loop around an outdoor track (pum 3jl:izxg;2 o8j +c400 m), in 100 s, your average velocity mpgl3ij; cz: +ojx82u is

  A polar bear starts at the Nortiyhs)qn5l bn+/ 7 lg6sh Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its stn/ 6glb+ nis7)hy 5slqarting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.h58v(hygnao2jri5ily m.5 d30 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its startingi55 mdv giy l28 n(5hj.3hyora point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles. q,v4g zzrkxc pqn) l, u-1jl539j7zux It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometoujl pr17x,zq9v xuzc j 3lkn54gq,z )-wn from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. Whaudw2j9ogkm( m u;*y ,p. q-m1kl5 lvuft is the average speed of the motorist for mdkv;. 2*luk5 9 wlumgp-yu1mq, oj(fthis trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. Whjxgtb5as2e2l 52dx 0ihe rr(+ at is her averagd(2 erg ij5xr es2+x2h lt05abe speed for the trip?

  An airplane travels at 3gnzqj mi*:ps t(56pz:00 mi/h south for 2.00 h and then at 250 mi/h north for 750 milestp( *5zzi:js6 pnqm:g . What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs thee7sre0 y +qs94 *ul fs7wqh6n 88i zqx3h-qgaq 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 ruq8 *w uh867qqrsx34 sezyag 79lq+qeh -0fni snner 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 uniformly and comes to a stop after 12 s. The vqojcyk vo+z,r9f,is,8 )s 0 q7uz6bc car's average velocity during deceleration was y ,ok9,scs brfvu,+q8oqv)07 j zczi 640 km/h. What was the car's deceleration while slowing down?

  An airplane increases its sp9k j7 7dwgfu.feed from 100 m/s to 160 m/s, at the average rate of 9.f gkuf7 wd7j$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the ra2big 2: wzx )xo8dffs7te 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 accelerat anuwr4w e5ysp*n/3l;es 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 kqex-e-5rr- t with a constant acceleration o--rq rkxe5 te-f $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 5.9 m/s experien-a- :s,ee4c+vc)plsl vlwbvad020hhces a constant acceleration of ecl4vcl2) -wse :sb,-vh aldap00+ vh$4.1 \; m/s^2$. What is the cart's displacement during the first 6.8 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a sn(u ha;+hx xxvd9as+ -peed of 373 m/s su;x+d-ns+ hhaax(x9vtrikes a sandbag and penetrates a distance of 51.66 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 carrier.7v4 ymch5p.wy mbom7. It reaches a speed om by7h5pw4o.m7yv c. mf 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 consb;zshyn8h9(;orq 6 tc *bf+bvtant 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 80 m/s in a distance of 200 tm.gk is l-7x:;k9 kaum. What is its average acceleration?:glu .t-x7; ksiak m9k

  An object starts from restei(bgk/m 4 3 55 9ix gkfuj1rdfxmkp)p1/b,p o and undergoes uniform acceleration. During the first se i1/m,ej9pxgxo(u1prd3f)b pb fki5 mg 5kk4/cond it travels 8.5 m. How far will it travel during the third second?

  An object is moving in a straight line with constant bgvj1fcygfu/n9 :1vi ( *l.psacceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at .ggu:(v v 1 fcfb*p9l /y1sijn10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniformly k(2lx zx ac(ohc3/qm1at $3.0 \; m/s^2$. 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 deceler3-k i 3xgou9yuate 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 cb (p3;n.ob -m ; tn,p;ode- ztmd.baswar that has been waiting at the interse -m.td zn; n3a;b,-bdo w obmps;.(etpction 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 upwbt5/,r jh/ xs6yp hi),f- bwo b4b0mcward with a speed of 12 m/s on the surface of planet X where the accelerationx05hb-w, pb/ybo6j/scrt)mh4,bifw due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upwardp2fchc a- ,k x(p;ue.g with a speed of 12 m/s on the surface of planet X where the acceleration due to a c pe,hgu(pfk.- 2cx;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 fb2n vdc 2)5b s:zcvu8m/s on the surface of planet X where the cuz8)dvf b:c52sn2bvacceleration 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/s on theqlf d+bv--5tqha)t-l surface of planet X where thdlv+5-qtlqb fa - h-t)e 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 tzg cpdq55d :1 0nsyhjc;pd).usually greater than 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 fall btcz 5 d0y5h ;jps)ngd:1cq. pdefore you catch it?

  A ball is thrown upwar+n) :6jk12m 5*aq je)u7vmr ov pjubaud at a velocity of 19.6 m/s. What is its velocity after 3.00 s?oqkbvm um1:e+2)ur6*jv7a j uj n5ap )

  A bullet shot straight up retz , npdtr.wn.0urns to its starting point in 17 s. What is the initial speed of the 0t,znndr . p.wbullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it takfsb 89i.7nu dj1a0(eckthhkny)2 l27f ;ss ml e to retk y1e 0uj 7h 2sn 7bf)l;fhm(lidat2ssn.kc89 urn to its starting point?

  A ball is thrown downward from the top of a building with an ini *8e nag40hodotial speed of 14 m/s. It 8ong h eo0d*a4strikes the ground after 5.1 s. How high is the building?

  A ball is thrown straie3+ kb 1wysoi3ght up with a speed of 30 m/s. (only fill in numerical value in the+ ob1ywe3s 3ki 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 spencl , 96 bo:wpnsk3v hsq*qe ze2c5q))ed of 36.9 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 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 they(i)y/wz qp)h velocity at t = 1.0 s?

  In Fig. below, what is the velocity at t = 2.5 :mm ffr-e4nq cjn)q8)p :bqq1s?

  In Fig. below, what is the velocity at t = 4.mb z/dxd(9 qj;0 s?

  In Fig. below, what is the velocity at /mp(rv. rrzw i7e4 ux-t = 5.5 s?

  In Fig. below, what is the average veloc.v:k 23ym brh8gh3g2c puov2vity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6.0 *o nyn1, bv8pzylb)m 9s?

  In Fig. below, what su/ 4yklu, w n.5rif4pis the acceleration at 1.0 s?

  In Fig. below, what is the acceleratiogf9 : l*c;:/nmt- gij8gnlq /k )grlarpfx*j, n at 3.0 s?

  In Fig. below, what is the average ac7hi))esa a:gfceleration from 0 to 5.0 s?

  In Fig. below, what is the average a jnn 9t4wnsga5.6f +3tup c:tz 9,xplncceleration from 0 to 8.0 s?

  In Fig. below, what is the disp,+ yjj ;ehm 2pocr+grtf/gc*i:f*q i+mm- 5znlacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|veloctu+ 4 ezqo2;padl)hp 0s2a ::uq8.yvjf kxi2uity}

  An object can have a varying speed if its velocity is constanae dhkw)h8 yao za) )g9f2*b9jkn:l -st.

  The velocity of an object can be negative when its ac/,q72b vl,sjr)pvycurw:lf3celeration is positive.

  If one object has a greater speed than a second object, the first muhleog ;4 8ge780*o x;uckq,k yyyp.oist have a greao 8opk ,kg4.*eg ly;cix8oe0h q7 yyu;ter acceleration.

  Two cars emerge side by side from a tum93xjvz ) w)4sua.mqxsw, 9y hnnel. 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 acceleration - k97b .8qjjm e.hyfe7mehu;rdecreases.

  A baseball player hits a foul ball straight up into .hwb- yj w7b2u ju2ya9nya0k( the air. It leaves the bat with a speed of kwn02aj.ywjh y ub(-7y u9 ab2$120 \; km/h$. 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 ha 7 + hs/s/bq37t6ehgm cwu1jdkppening to its acceleration, how does it changk7m7 ghsh eb sj+ct/q /d6uw13e if air friction is ignored?

  As a freely falling objece8d)x9oi+6zjuv eu3a9nrh 7d3rz x q( t speeds up, what is happening to its acceleration, how does it change if air friction CAN NOT be igr)+v n33 ozauh67j9 9 eui8xerqx dd(znored?

  An object that is thrown vertically upward will return to its original(ayb*j11x 71lly ns vl position with the same speed as it had inilyxja1 71b nl*vy1 ls(tially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzeod- yx e: :oqiu vb+-xn:8z9cero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the sam4mz tmz t6i62nav, +d;gnnc m;e time.

  An elevator moving from the second floor to the fifth flp w)q:w3l+ 1zrbb gqffr/q;q/ oor making no stops along the way has zel/;bwfqr p q /w3r)qq: bgz+1fro acceleration all the time.

  A rolling ball moves ft9g54sk(hc) n+ccs,r*xxkc 4nz fj+rrom $x_1=2.0 \mathrm{~cm}$ to $x_2=-8.8 \mathrm{~cm}$ during the time from $t_1=1.5 \mathrm{~s}$ to $t_2=6.1 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.4 \mathrm{~s}$ is at $x_1=2.2 \mathrm{~cm}$ and at $t_2=3.1 \mathrm{~s}$ 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 quartee9px6 axpce5p/3q q0 zr-mile ($1 \; mile = 1609 \; m$) track in a total time of 11.3 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from itsjve9 /mb *g;xbm* (nggw-ss)l trainer in a straight line, moving 107 m away in 1-bbw)xmge gg9 *m ;( sn/lsj*v1.8 s. It then turns abruptly and gallops halfway back in 4.6 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 fr :fdp*9qh qghf963se njmw5(xom $11 \; m/s$ to $25 \; m/s$ in 4.9 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 fro ;d-;i+ ppksodm $16 \; m/s$ 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 in+qd9 gn0n05b7ng cp speed of $28 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.2 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can but0od ;l8 ra4wlrst out of the blocks to essentially top speed abou84 t;wr0ol ldat $11.0 \; m/s$ in the first 11.0 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 fr . qps8y+k gxed/nj4(fom a speed of $16 \; m/s$ to rest in 5.70 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop,z 9wuep4s,s/ +vurhp- z4 gt7m a car leaves skid marks 92 m long on the highway. Assuming a deceleration 9z umupsz r g 7/t+4whps-e,4vof $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck gpj h5 ecvozdqqr/p26m/r );7iw 0 wd2going $25 \; m/s$ 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).    $m$