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Average power given velocity, kinetic friction, and mass

  1. Jul 13, 2013 #1
    A 23.5-kg rock is sliding on a rough, horizontal surface at 9.15 m/s and eventually stops due to friction. The coefficient of kinetic friction between the rock and the surface is 0.180. What average power is produced by friction as the rock stops?

    I think that the way to solve it is use determine the force first then use the definition of work from my textbook using the two vector quantities F*V. However, I cannot seem to determine the force.

    Please not if you do respond it would be helpful to me if you use math and not just say something like No, just use the standard constant acceleration equations. That really didn't help me with my last problem
  2. jcsd
  3. Jul 13, 2013 #2
    You know the coefficient of friction....you need to know the weight ( easy if you know ' g')
    So you know F and v....
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