You guys probably know that too from your days at the daycare, but I want to derive the formula and put it up, then we'll see how to use it.

你们可能从幼儿园起就已经知道这个式子了,但是我想重新推导一遍,再来看如何进行运用

耶鲁公开课 - 基础物理课程节选