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Nov14-12, 03:23 PM
P: 5,462
Finally, your statement: Spring force = 0.5kx2 is not correct. F = -kx.
In case this was a simple slip, the formula

[tex]W = \frac{1}{2}k{e^2}[/tex]

W = work, e = extension, k = spring constant

Refers to the work done in extending a spring = potential energy stored in that spring on extension.