Two masses $m_1=1 \,kg$ and $m_2=0.5 \,kg$ are suspended together by a massless spring of spring constant $12.5 \,Nm ^{-1}$. When masses are in equilibrium $m_1$ is removed without disturbing the system. New amplitude of oscillation will be .......... $cm$

  • A

    $30$

  • B

    $50$

  • C

    $80$

  • D

    $60$

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  • [AIPMT 2007]

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