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Conservation of energy of a spring problem

  1. Jun 29, 2009 #1
    1. The problem statement, all variables and given/known data
    A 1.20-kg piece of cheese is placed on a vertical spring of negligible mass and force constant k = 1800 N/m that is compressed 15.0 cm. When the spring is released, how high does the cheese rise from this initial position? (The cheese and the spring
    are not attached.)

    2. Relevant equations
    Conservation of Energy equation.

    3. The attempt at a solution
    Actually what i wanna know is, while calculating the gravitational potential energy, should i include 15.0 cm(ie distance by which spring is compressed) or should i start from the point from where it leaves the spring?? kindly clarify.
  2. jcsd
  3. Jun 29, 2009 #2

    Doc Al

    User Avatar

    Staff: Mentor

    The initial position is the compressed position--measure changes in gravitational PE from that lowest point. (Measure the final height from that point as well.)
  4. Jun 29, 2009 #3
    Thanks Doc :-)
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