Once you've got that, one derivative will give you the velocity, then in a crunch you can eliminate t and put it into this formula.

一旦你得到了这个,求一阶导数就能得到速度,然后你可以消去t,把它代入这个式子

耶鲁公开课 - 基础物理课程节选

Charlie was just disappointed he couldn't contribute to the mass apple-biting moment: a wobbly tooth meant he couldn't crunch on his apple properly.

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