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December 19, 2014

December 19, 2014

Posted by **christ** on Thursday, January 24, 2013 at 10:07pm.

- phy -
**Elena**, Friday, January 25, 2013 at 5:37amF=kx=k(L-L`)

k=F/(L-L`)

W=kx²/2= F (L-L`)²/2(L-L`)= F (L-L`)/2.

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