Help A 6.0 g ball moves south at 3.0 m/s when it collides head on with an identical...

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Gaga L

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...ball that is .........? A 6.0 g ball moves south at 3.0 m/s when it collides head on with an identical ball that is moving north at 2.0 m/s. Immediately after collision the first ball moves south at 1.0 m/s. What is the velocity of the 2nd ball?

please show me how to do this question
 
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