Two equal masses are attached to the two ends of a spring constant \( k \). The masses are pulle...

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Two equal masses are attached to the two ends of a spring constant \( k \). The masses are pulled out symmetrically to stretch the spring by a length \( x \) over its natural length. The work done by the spring on each mass is :
(A) \( \frac{1}{2} k x^{2} \)
(B) \( -\frac{1}{2} k x^{2} \)
(C) \( \frac{1}{4} k x^{2} \)
(D) \( -\frac{1}{4} k x^{2} \)
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