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March 29, 2017

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A weightlifter holding a 500 kg barbell waist high carries the barbell at a constant height and a constant speed to a rack 2 m away, and places the barbell on the rack at the same height at which he was carrying it. How much work does the weightlifter do on the barbell?

  • physics - ,

    Constant height? He did not work against gravity, then.

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