Posted by **Erika** on Wednesday, November 14, 2012 at 6:27pm.

A 50.0 Kg ball rolling at 10.0 m/s eastward (on a frictionless surface) collides with a 20.0 Kg ball rolling westward at 20.0 m/s. After the collision the two balls stick together (coalesce). What is the momentum after the collision?

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