He said, first, let it go a little distance, take the distance over time, that gives you the velocity now.
他说,首先,让它运动一小段距离,距离除以时间,你就能得到现在的速度
Let it go a little more, that gives you the velocity later.
让它再运动一小段距离,那就能得到稍后的速度
It's the pace or speed of the-- Piece.
是什么的进行速度呢,一段乐曲
The pace or the speed of the piece?
一段乐曲的行进的步调或速度
Second formula tries to relate the final velocity of some time, t, to the initial velocity and the distance traveled with no reference to time.
第二个式子能把某段时间t的末速度,和初速度,经过的路程联系在一起,并且不引入时间
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