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; the amplitude of vibration is
- A$m_1g / k$
- B$m_2g / k$
- C$\frac{(m_1 + m_2)g}{k}$
- D$\frac{(m_2 - m_1)g}{k}$
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