\[\begin {array} {1 1} (a)\;\frac{m_1m_2}{(m_1+m_2)}r^2 & \quad (b)\;(m_1+m_2)r^2 \\ (c)\;\frac{m_1m_2}{(m_1-m_2)} r^2 & \quad (d)\;(m_1-m_2)r^2 \end {array}\]

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