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Homework Help: Natural length of spring

  1. Apr 25, 2009 #1


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    1. The problem statement, all variables and given/known data
    If 6 J of work is needed to stretch a spring from 10 cm to 12 cm, and another 10 J is needed to stretch it from 10 to 12 cm, what is the natural length of the spring?

    2. Relevant equations
    Hooke's Law

    3. The attempt at a solution
    Honestly, I stare at this problem and am at a loss as to where to start, and there are no examples in the book like this. Obviously I'm not asking for answers because I know the rules here, we're supposed to show effort; but if someone gave me some starting help it would be much appreciated.
  2. jcsd
  3. Apr 25, 2009 #2


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    Homework Helper


    PE = 1/2*k*x2
  4. Apr 25, 2009 #3

    Doc Al

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    Staff: Mentor

    Looks like you have a typo in the problem statement.

    Hint: Call the unstretched length of the spring L. How do you determine the work done to stretch a spring? (What's the expression for spring potential energy?)
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