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A mass \( M \) is suspended from a light spring. An additional mass \( m \) added displaces the spring further by a distance \( x \).
\( \mathrm{P} \) Now the combined mass will oscillate on the spring with

W period
[CPMT 1989, 98 ; UPSEAT 2000]
(a) \( T=2 \pi \sqrt{(m g / x(M+m))} \)
(b) \( T=2 \pi \sqrt{((M+m) x / m g)} \)
(c) \( T=(\pi / 2) \sqrt{(m g / x(M+m))} \)
(d) \( T=2 \pi \sqrt{((M+m) / m g x)} \)
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