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".

http://ift.tt/1htunb3

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# conservation of energy- basics

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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".

http://ift.tt/1htunb3