Trying to calculate the velocity of center of mass - Is this correct?

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Homework Statement



I have to find the velocity of center of mass of a elastic collision.

Momentum:

Ball Ai = .23 J
Ball Af = .06 J

Ball Bi = .02 J
Ball Bf = .19 J

Am I correct in saying that all you have to do is you take the total momentum of both balls and divide by the total mass of the two balls and thats the velocity before and after the collision.

So, total momentum divide by mass of 2 balls = .50 / .500 ? Is that correct?





Homework Equations





The Attempt at a Solution

 

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