A man of mass m1 = 80 kg is standing on ...

A man of mass `m_1` = 80 kg is standing on a platform of mass `m_2` = 20 kg that lies on a frictionless horizontal surface. The man starts moving on the platform with a velocity `v_r` = 10 m/s relative to the platform. Find the recoil speed of the platform.

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The correct Answer is:

8.0 m/s

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