Two springs of force constant $K$ and $2K$ are connected to a mass as shown below. The frequency of oscillation of the mass is
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$\frac{1}{\mathrm{K}_{\mathrm{eq}}}=\frac{1}{\mathrm{K}_{1}}+\frac{1}{\mathrm{K}_{2}}$
$=\frac{1}{\mathrm{K}}+\frac{1}{2 \mathrm{K}}$
$\mathrm{Keq}=\frac{2 \mathrm{K}}{3}$
$\mathrm{n}=\frac{1}{2 \pi} \sqrt{\frac{2 \mathrm{K} / 3}{\mathrm{M}}}=\frac{1}{\pi} \sqrt{\frac{\mathrm{K}}{6 \mathrm{M}}}$
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