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A mass \( M \) is suspended from a massless spring. An additional mass \( m \) stretches the spring further
\( \mathrm{P} \) by a distance \( x \). The combined mass will oscillate

W with a period
(1) \( 2 \pi \sqrt{\left\{\frac{(M+m) x}{m g}\right\}} \)
(2) \( \left.2 \pi \sqrt{\left\{\frac{m g}{(M+m) x}\right\}}\right\} \)
(3) \( 2 \pi \sqrt{\left\{\frac{(M+m)}{m g x}\right\}} \)
(4) \( \frac{\pi}{2} \sqrt{\left\{\frac{m g}{(M+m) x}\right\}} \)
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