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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