Two springs of force constants $K$ and $2K$ are connected to a mass as shown below. The frequency of oscillation of the mass is
AIIMS 2003, Medium
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(c) $n = \frac{1}{{2\pi }}\sqrt {\frac{{{K_{effective}}}}{m}} = \frac{1}{{2\pi }}\sqrt {\frac{{(K + 2K)}}{m}} $=$\frac{1}{{2\pi }}\sqrt {\frac{{3K}}{m}} $
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