The natural frequency of the system shown
(a)$\sqrt{\frac{k}{2m}}$ (b)$\sqrt{\frac{k}{m}}$
(c)$\sqrt{\frac{2k}{m}}$ (d)$\sqrt{\frac{3k}{m}}$
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(b)$\sqrt{\frac{k}{m}}$ 
(d)$\sqrt{\frac{3k}{m}}$ 