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An elastic spring of unstretched length ...

An elastic spring of unstretched length `L` and force constant `K` is stretched by amoun t `x` .It is further stretched by another length `y` The work done in the second streaching is

A

`((1)/(2)) ky^(2)`

B

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

C

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

D

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

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The correct Answer is:
D
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