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The height of a spring loaded pen

  1. Apr 10, 2010 #1
    Hi, you no those pens, that you have to push the top down, which is loaded with a spring to use? Well I was wondering if I released it on my desk how high would the pen travel?

    I know that the spring PE=0.5kx^2 and the the spring force is F=Kx, but not sure were to go from there?

    Thanks James
  2. jcsd
  3. Apr 10, 2010 #2

    jack action

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    Energy conservation:

    ½*k*x² = m*g*h

    where m is mass of the pen.
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