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Homework Help: Kinetic friction problem

  1. Dec 11, 2007 #1
    1. The problem statement, all variables and given/known data
    A baseball player slides into third base with an initial speed of 7.90 m/s. If the coefficient of kinetic friction between the player and the ground is .41, how far does the player slide before coming to rest?

    2. Relevant equations

    3. The attempt at a solution

    I have absolutely no idea how to solve this question.
  2. jcsd
  3. Dec 11, 2007 #2
    I'll start it for you:

    f(net) = ma

    f(friction) = ma

    mu(k)*g*m = ma

    mu(k)*g = a

    Then you can use these two formulas and you should be able to solve it:

    a = (v(final)-v(initial))/t

    d = 1/2*a*t^2 + v(initial)t

    Just a hint: remember that g is negative.
  4. Dec 11, 2007 #3


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    Science Advisor
    Homework Helper

    The energy the player expends sliding is frictional force times distance. The initial energy of the player coming in is (1/2)*m*v^2. Equate them.
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