Take the difference of the two velocities and divide by the difference of the two times, and you've got the acceleration.

求出速度的差值,除以时间的差值,这样就能得到加速度

耶鲁公开课 - 基础物理课程节选

It's useful to have the average acceleration, which you can find by taking similar differences of velocities.

平均加速度也是很有用的,你可以用类似方法,取速度的变化量求出来

耶鲁公开课 - 基础物理课程节选

All velocities I see you will add a certain number to get the velocities according to you.

而我观察到的速度,你也要给它加上某个数值,来得到你观察到的速度

耶鲁公开课 - 基础物理课程节选

That's because they could have been released from different heights with different initial velocities.

那是因为它们可能是从不同的高度,以不同的初速度被抛出的

耶鲁公开课 - 基础物理课程节选

This is the rule for adding velocities.

这就是速度叠加的法则

耶鲁公开课 - 基础物理课程节选