If the period of oscillation of mass $m$ suspended from a spring is $2\, sec$, then the period of mass $4m$ will be .... $\sec$
AIIMS 1998, Medium
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(d) $T = 2\pi \sqrt {\frac{m}{k}} $
==>$\frac{{{T_2}}}{{{T_1}}} = \sqrt {\frac{{{m_2}}}{{{m_1}}}} = \sqrt {\frac{{4m}}{m}} = 2$
$ \Rightarrow {T_2} = 2 \times 2 = 4\;s$
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