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An elastic spring of length L and spring...

An elastic spring of length L and spring constant K is stretched by a length x. It is then again stretched to a length y. The work done in the second case will be

A

(A) `1/2Ky^2`

B

(B) `1/2K(x^2+y^2)`

C

(C) `1/2K(x+y)^2`

D

(D) 1/2Ky(2x+y)

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The correct Answer is:
D
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