physics

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a skier moving at 15 m/s down a 20 degree slope encounters a region of wet snow of coefficient of friction is 0.8. how far down the slope does she go before stopping

  • physics -

    Beginning energy: 1/2 m 15^2
    lost energy while slowing: mg*(cos20)*(mu)distance

    gained energy while slowing: mg (d/sin20)

    final energy=0

    finalenergy=betinning enrgy+gained energy-lost energy

    0=1/2 m 15^2+mg*d/sin20-.8 mg*(cos20)*d

    solve for diistance d

  • physics -

    The mass is not given in the problem, does that mean it cancels out?

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