A mass \( M \) attached to a spring oscillates with a period of \( ...

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A mass \( M \) attached to a spring oscillates with a period of \( 2 \mathrm{~s} \). If the mass is increased by \( 2 \mathrm{~kg} \) the period increases by one sec. Find the initial mass \( M \) assuming that Hooke's
\( \mathrm{P} \) law is obeyed.
(1979)
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