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Elastic Potential Energy Stored

  1. Oct 23, 2006 #1
    Question - A stretched elastic band of mass 0.67g is released so that its initial velocuty is horizontal, and its initial position is 9.6 com above the floor. What was the elastic potential energy stored in the stretched band if, it has a horizontal displacement of 3.6 m from its initial position?

    Solution

    Find v
    At finish (h = 0)
    Et = Ek + Eg
    Et = 0.000335v^2

    At Start (h = 0.096m)
    Et = Ek + Eg
    Et = 0.000335v^2 + 0.0006309792
    by Law of Conservation of Energy (LCE)
    Et = 0.000335v^2
    0.000335v^2 = 0.000335v^2 + 0.0006309792

    so when I got there, I was stuck and thought I went down the wrong track

    But my method was going to be to find the velocity so I could find Ek which equals Ee because:

    W = Ek
    W = 1/2 k x^2
    Ee = 1/2 x^2
    so
    Ee = Ek
     
  2. jcsd
  3. Oct 23, 2006 #2

    OlderDan

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    Science Advisor
    Homework Helper

    Your last appraoch will relate the velocity the band acquires at the intitial height to the elastic energy. Then it is a projectile problem to find that velocity.
     
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