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A 132 lb. (60 kg) person does a standing vertical jump. Starting from rest, she jumps...

A 132 lb. (60 kg) person does a standing vertical jump. Starting from rest, she jumps vertically and reaches 70 cm (= 0.7m). The push-off phase takes 0.5 seconds. After being airborne, the landing takes 0.5 seconds before she comes to rest. How much mechanical work did the leg muscles produce during the push-off?  

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