题目内容

The quantity of work equal to one joule is also equivalent to which of the following（）

A. watt
B. watt /s
C. watt∙s
D. watt /s^2

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A Hooke’s law spring is mounted horizontally over a frictionless surface. The spring is then compressed a distance d and is used to launch a mass m along the frictionless surface. What compression of

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