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An elastic string of unstretched length ...

An elastic string of unstretched length L and force constant k is stretched by a small length x. It is further stretched by another small length y. The work done in second stretching is

A

`1/2k(x+y)^2`

B

`1/2ky(2x+y)`

C

`1/2ky^2`

D

`1/2k(x^2+y^2)`

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