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An athlete lifts a 160 kg barbell through a vertical displacement of 1 26 m...

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An athlete lifts a 160 kg barbell through a vertical displacement of 1 26 m requiring 4 40 s for the lift a Calculate the average mechanical power he must deliver to the barbell during the lift W b For a short period he lifts the barbell at a constant speed of 0 790 m s What instantaneous power does he deliver to the barbell during that W

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