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physical science

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A 136-lb. student races up stairs with a vertical height of 4.8 m in 6.0 s to get to a class on the second floor. How much power in watts does the student expend in doing work against gravity?

  • physical science -

    power = work/time
    work = force * distance

    136 lb * 4.448N/lb = 605N
    605N * 4.8m / 6.0s = 484W

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