Velocity of bodies in contact

Hi,

Maybe this is more a mechanical question, but here goes.

In a ring on block wear test, if both bodies are in motion, the speed of the ring (RPM) and the speed of the block in motion would both be differ on contact from what the were originally were.

Is there a way of calculating what the speeds of both bodies would be during contact? If one knows the speeds of both bodies before contact, can one calculate what the speeds would be when they come into contact before carrying out the actual experiment?
 

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