The displacement of a body depends on the reference P frame of the observer who measures it. It ...

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The displacement of a body depends on the reference
P frame of the observer who measures it. It follows that the work

W done on a body should also depend on the observers reference frame. Suppose you drag a crate across a rough floor by pulling on it with a rope. Identify reference frames in which the work done on the crate by the rope would be (a) positive, (b) zero, and (c) negative.
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