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Streching a spring, please help!

  1. Feb 13, 2008 #1
    To stretch a spring a distance 3.09cm from its unstretched length, an amount of work of11.1j must be done. How much work must be done to compress this spring a distance 4.08 from its unstretched length?

    I have been using the equation


    So I plug 718N into
    I get 14.6 but it is still not the right answer someone please help
  2. jcsd
  3. Feb 13, 2008 #2


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    You've put in an unneeded extra step here in solving for F, and in so doing, you have made in error in your last equation. If you solved that k = 718/.0309 in the first step, why are you using k=718/.0408 in the other? The k must be the same.
  4. Feb 13, 2008 #3

    Doc Al

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    You won't need this, since you don't care about the force.
    You'll need this.

    First step: Use the data for the 3.09 cm stretch to find k.
  5. Feb 13, 2008 #4
    Thank you, I didnt even notice that
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