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A 16.0-N weight slides down a rough inclined plane that makes an angle of 28.0° with the horizontal. The weight, which started from rest, gains a speed of 15.0 m/s after sliding 150 m. How much work is done against friction?

  • physics -

    use the work-energy theorem

    determine mass = 16.0N/9.8 m/s^2
    initial velocity = 0; so initial KE = 0
    final velocity = 15.0 m/s
    final height = 0; so final PE = 0
    initial height = 150 sin 28.0 degrees

    substitute values in the work-energy theorem expression

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