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Conservation of energy- basics

  1. Mar 1, 2014 #1
    The mass is released at height h above the spring, how far will the spring move? Ei=mgh,Ef=kx2/2+mgx...why the second equation isn't Ef=kx2/2−mgx? Since it is below the "zero".
     

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  3. Mar 1, 2014 #2
    Your equation for Ef is correct.
     
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