As shown in Figure, a mass of 100 kg is held between two springs. The natural frequency of vibration of the system in cycle/s, is
(a) $\frac{1}{2\pi }$ (b) $\frac{5}{\pi }$
(c) $\frac{10}{\pi }$ (d)$\frac{20}{\pi }$
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$\frac{1}{2\pi }$ (b) $\frac{5}{\pi }$
$\frac{10}{\pi }$ (d)$\frac{20}{\pi }$ 