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**1. Homework Statement**

2 identical biliards balls collde after a glancing collision determine the speed of the other ball,

**2. Homework Equations**

MaVa + MbVb = MaVa' + MbVb' ?

**3. The Attempt at a Solution**

is this just as simple as the momentum formula before and after, or am I forgetting somthing obvious, because 5cm/s in the other direction dosent make any sense