Let's try the conservation of mechanical energy.
让我们试着用机械能，守恒定律解答一下。
So this is the conservation of mechanical energy.
因此这是，机械能守恒。
We have also the conservation of mechanical energy.
还是机械能，守恒。
I trust the conservation of mechanical energy 100%.
我百分百相信，机械能守恒。
We believe in the conservation of mechanical energy.
我们相信,机械能守恒定理。
Now I want to return to the conservation of mechanical energy.
现在我想回到，机械能守恒。
It follows immediately from the conservation of mechanical energy.
它紧跟着，机械能，守恒定理而产生。
We didn't even talk about it when we did the conservation of mechanical energy.
我们甚至没有讲过它,当我们运用机械能,守恒定理的时候。
There must be something fundamentally wrong with the conservation of mechanical energy.
肯定有什么，基础性的错误，这个机械能守恒定理。
LEWIN Shall we try the conservation of mechanical energy Is there anything wrong with that?
大声点。，lewin：，So, speak, up。，我们可以尝试用，机械能守恒定律吗？，这样用有什么问题吗？
I'm going to write down the conservation of total energy, mechanical energy.
我要写下整体的，能量守恒，机械能。
I'm going to write down the conservation of total energy, mechanical energy.
我要写下整体的，能量守恒，机械能。
应用推荐