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Homework Help: Coefficient of kinetic friction of skis

  1. Oct 29, 2007 #1
    1. The problem statement, all variables and given/known data

    Sam, whose mass is 75 kg , takes off down a 50 m high, 10 degree slope on his jet-powered skis. The skis have a thrust of 200N . Sam's speed at the bottom is 40 m/s . What is the coefficient of kinetic friction of his skis on snow?

    2. Relevant equations

    Fk = uk N
    u = Fk / N

    3. The attempt at a solution

    Theres an answer to this question in the back of my book and I've been trying to figure out why the author got this answer uk = 0.165 . The reason I am doing this is to apply the same technique to figure another problem like this on masteringphysics.com. Thank you for your help!!!
  2. jcsd
  3. Oct 29, 2007 #2
    Use work-energy principle.
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