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The spring as shown in figure is kept in a stretched position with extension \( x \) when the system is
\( \mathrm{P} \) released. Assuming the horizontal surface to be

W frictionless, the frequency of oscillation is
(1) \( \frac{1}{2 \pi} \sqrt{\frac{k(M+m)}{M m}} \)
(2) \( \frac{1}{2 \pi} \sqrt{\left.\frac{m M}{k(M+m)}\right]} \)
(3) \( \frac{1}{2 \pi} \sqrt{\left[\frac{k M}{(m+M)}\right]} \)
(4) \( \frac{1}{2 \pi} \sqrt{\left.\frac{k m}{(M+m)}\right]} \)
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