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Two equal masses are attached to the two...

Two equal masses are attached to the two ends of a spring of spring constant `k`. The masses are pulled a part symmetrically to stretch the spring by a length `x` over its natural length. The work done by the spring on each mass is.

A

`1/2 kx^(2)`

B

`-1/2 kx^(2)`

C

`1/4 kx^(2)`

D

`-1/4 kx^(2)`

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The correct Answer is:
D
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