Calculating Coefficient of Restitution for Two Solid Balls Colliding

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nysnacc
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Homework Statement


upload_2016-10-12_21-10-1.png


Homework Equations


MaVa1 + MaVb1 = MaVa2 +MaVb2

The Attempt at a Solution


I found Va2 = 2 m/s

e is found to be 1.75, correct?
 
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I found it 0.81 something! thanks