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If you slide a block along a frictional surface, you do work against friction. Suppose you...

If you slide a block along a frictional surface, you do work against friction. Suppose you smack the block so that it slides along for a while, but comes to a stop. The block started at rest and ends up at rest, but you’ve done work. Does the work-energy theorem fail, here? If so, why? If not, where did the energy go?

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Work energy theorem does not fail.

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