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If no external force is acting on a two ...

If no external force is acting on a two body system, what will happen to (i) velocity of centre of mass and (ii) angular momentum ?

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(i) Whatever be the interaction between the two bodies, their centre of mass would remain remain unaffected if no external force is acting. So, if the centre of mass is at rest or in motion initially it would continue in that state, i.e, would be at rest or in motion with a uniform velocity.
(ii) External force = 0, so, external torque on the system =0. Hence, the angular momentum of the system would remain conserved.
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