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HallsofIvy is online now
Dec16-12, 06:26 PM
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Basically, it is inefficiencies in your muscle that account for your not getting the energy "back". It goes into increased heat in your body, a little increased heat in the air, because of air resistance, and, if you let the block hit the ground "hard", increased heat in the ground and block.

Generally, the answer to "where does the energy go" is "into heat".