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A weightlifter is trying to carry a 10 kg weight held over his head across the room. How much energy will be required to do this work on the 10 kg weight?

  • physics -

    No energy will be required, as no work is being done one the weight as it is carried across the room.

    Wnc = Fdcos90
    cos90 = 0
    Wnc = 0
    Wnc = change in Emech
    change in Emech = 0

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