A mass \( m \) attached to a spring oscillates every \( 2 \mathrm{~...

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A mass \( m \) attached to a spring oscillates every \( 2 \mathrm{~s} \). If the mass is increased by \( 2 \mathrm{~kg} \), then time-period increases by \( 1 \mathrm{~s} \). The
\( \mathrm{P} \) initial mass is [CBSE PMT 2000;AIIMS 2000; MP PET 2000;

W
DPMT 2001; Pb. PMT 2003]
(a) \( 1.6 \mathrm{~kg} \)
(b) \( 3.9 \mathrm{~kg} \)
(c) \( 9.6 \mathrm{~kg} \)
(d) \( 12.6 \mathrm{~kg} \)
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