And so you could have used the work-energy theorem or you can use the conservation of mechanical energy.

所以你也可以用，功能定理，或者是机械能，守恒定律。

youdao

And so you could have used the work-energy theorem or you can use the conservation of mechanical energy.

所以你也可以用，功能定理，或者是机械能，守恒定律。

youdao