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How much work is done during one repetition of a weightlifting exercise?
Keeping it simple, let's say a 1000 N barbell is bench pressed 0.5 m
up and then down at roughly constant speed. The bar was replaced on
the rack with a polite minimum of clanking.
The change in GPE for the bar is simple, it increases 500 J and then
decreases 500 J.
What energy expenditure does the person make?
Scott