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  • a subway train starting from rest along a straight track has a uniform acceleration of 1.8m/s2 for the first 20m it trav

    a subway train starting from rest along a straight track has a uniform acceleration of 1.8m/s2 for the first 20m it travels.
    a.calculate its speed when it has traveled 10m.
    b.When it has traveled 20m,will its speed be less than double,double,or more than double its speed at 10m?
    c.Now calculate its speed when it has traveled 20m .Does this agree with you answer B
    英語人氣:907 ℃時間:2020-03-26 07:29:51
    優(yōu)質(zhì)解答
    題目說的是火車從靜止開始 做加速度1.8m/s^2的直線運(yùn)動.1.計(jì)算10m時的速度2.當(dāng)運(yùn)行了20m,火車的速度和10m的2被什么關(guān)系、大于?小于?3.計(jì)算20m的速度,是否和你在2中選擇的一樣.S=Vt^2/2a10m時候的速度Vt=6m/s20m時候...
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