Physics

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I'm having a problem understanding a question. "If a man exerts a 200N force while pushing a crate 5.0 m across a floor against a frictional resistance of 40N, how much energy was expended by the person pushing?" I can figure out work done on the box and those sorts of questions but I don't get what is meant by how much energy is the man expending.

  • Physics -

    The work expended is the applied force (200 N) times the distance the crate moved (5.0 m). The amount of friction does not affect that result.

  • Physics -

    Thank you.

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