Two masses $m_1$ and $m_2$ are supended 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$\frac{{\left( {{m_1} + {m_2}} \right)\,g}}{k}$
  • D$\frac{{\left( {{m_2} - {m_1}} \right)\,g}}{k}$
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