A weightlifter bench-presses a 1700 kg barbell from his, Ask an Expert

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A weightlifter bench-presses a 170.0 kg barbell from his chest to a height equal the length of his arms 0.750 m. How much work does he do? 1250.775 j I need to know What is the potential energy of the barbell relative to the weightlifter\'s chest after he lifts the barbell? and How many food calories does the weightlifter use if he does this lift 35 times? Assume the weightlifter does no work in letting the barbell drop back to his chest.

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