Two equal masses are attached to the two ends of a spring of spring...

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Two equal masses are attached to the two ends of a spring of spring constant \( k \). The masses are pulled out symmetrically to stretch the spring by a length \( x \) over
\( \mathrm{P} \) its natural length. The work done by the spring on each

W 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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