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A powerlifter deadlifts a 365 lb (167 kg) barbell to a height of 0.85 m, and...

A powerlifter deadlifts a 365 lb (167 kg) barbell to a height of 0.85 m, and then lowers the bar, applying a constant upward force. The bar reaches the ground with a speed of 2 m/s. What was the work done by the powerlifter in lowering the bar to the ground (in J) ?

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