$A$ man of mass $m_1$ is standing on a platform of mass $m_2$ kept on a smooth horizontal surface. If the man starts moving on the platform with a velocity $v$ relative to the platform,then the recoil velocity of the platform is:
- A$\frac{m_2v}{m_1+m_2}$
- B$\frac{m_1v}{m_1+m_2}$
- C$\frac{(m_1 + m_2)v}{m_1}$
- D$\frac{(m_1 + m_2)v}{m_2}$
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