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Spring with inclined plane

  1. Apr 21, 2009 #1
    1. The problem statement, all variables and given/known data
    30g object slides on slope of 20 degrees, with kinetic coefficient of .20. Object is launched up from a spring at bottom of slope, which was compressed by 10 cm. Spring constant = 25 N/m. Find the total distance object travels up slope before reversing direction.


    2. Relevant equations
    i don't know where to start with this. I tried equations of energy according to conservation of energy.


    3. The attempt at a solution
    initial: .5kx^2
    final: mgh
    therefore mgh=.5kx^2
    Then i rearranged for height.
    h=(kx^2/2mg)

    however, i think this is the wrong thing to do. I havn't even used the friction coefficient.
    Please help me get on the right track with this problem.

    Thanks in advance.
     
  2. jcsd
  3. Apr 21, 2009 #2
    The friction force does work on your object as it travels! How much work does it do, and how should you add this work into your energy equation?
     
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