Time how fast?

时间有多快？

youdao

It tells us at any time how fast we are going, and in what direction. So, for example, observe.

它告诉我们在任何时间我们运动的速度，以及它的方向，那么，举个例子。

youdao

I realize how fast time flies.

我意识到时间过得真快。

youdao

A clock tells you what time it is, but you can also say what time it is by seeing how fast the particle is moving because you know it started with some speed.

时钟能告诉你现在的时间,但你也可以通过测量质点速度,来判断当前的时间,因为你知道它的初速度

耶鲁公开课 - 基础物理课程节选

If you want to know how fast it's moving at a given time, if you want to know the velocity, I just take the derivative of this answer, which is 10-10t.

如果你想知道它在给定时刻的运动有多快,如果你想知道它的速度,我只要对这个式子求导,得到10-10t

耶鲁公开课 - 基础物理课程节选

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