Two masses ${m_1}$ and ${m_2}$ are suspended together by a massless spring of constant k. When the masses are in equilibrium, ${m_1}$ is removed without disturbing the system. Then the angular frequency of oscillation of ${m_2}$ is
A$\sqrt {\frac{k}{{{m_1}}}} $
B$\sqrt {\frac{k}{{{m_2}}}} $
C$\sqrt {\frac{k}{{{m_1} + {m_2}}}} $
D$\sqrt {\frac{k}{{{m_1}{m_2}}}} $
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B$\sqrt {\frac{k}{{{m_2}}}} $
b (b)$\omega = \sqrt {\frac{k}{m}} $
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