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The work done by a spring force when a spring is stretched from x1 to x2 is:

A1/2 k(x2 - x1)^2

B1/2 kx2^2 - 1/2 kx1^2

C- [1/2 kx2^2 - 1/2 kx1^2]

Dkx2 - kx1