p2 So they're both p2. external is p2 p2 V2 T2 and I have p2, V2, T2, on the other side.

都是2,这样末态是。

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As long as we understand that, we can do this cancellation and this says on the left-hand side the change in the quantity v square over 2 is a times the change in the quantity x.

只要我们明白这一点,我们就可以这样做简化,在等号左边,v^/2的变化量,为a乘以x的变化量

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