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A man (mass = 50 kg) and his son (mass =...

A man (mass = 50 kg) and his son (mass = 20 kg) are standing on a frictionless surface facing each other. The man pushes his son so that he starts moving at a speed of `0.70 m s^(-1)` with respect to the man. The speed of the man with respect to the surface is:

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