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The body stores about 4 g of carbohydrates, equivalent to 6800 J of chemical energy. Starting from rest, a 68 kg runner climbs a stair

The body stores about 4 g of carbohydrates, equivalent to 6800 J of chemical energy. Starting from rest, a 68 kg runner climbs a stair of 2.7 m high. At the top, his speed reaches to 75 cm/s. What is the efficiency of climbing the stairs?

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