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A body of mass \( m \) is attached to the lower end of a spring whose upper end is fixed. The spring has negligible mass. When the mass \( m \) is slightly pulled down and released, it
\( \mathrm{P} \) oscillates with a time period of \( 3 \mathrm{~s} \). When the mass \( \mathrm{m} \) is

W increased by \( 1 \mathrm{~kg} \), the time period of oscillations becomes
5s. The value of \( \mathrm{m} \) in \( \mathrm{kg} \) is
[NEET (Phase-II) 2016]
(a) \( 9 / 16 \)
(b) \( 3 / 4 \)
(c) \( 4 / 3 \)
(d) \( 16 / 9 \)
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