1. The problem statement, all variables and given/known data Similar to the other one... On billiard ball is shot east at 2.6m/s. A second, identical billiard ball is shot west at .8m/s. The balls have a glancing collision, not a head-on collision, deflecting the second ball by 90 degrees and sending it north at 1.58m/s. What are the speed and direction of the first ball after the collision? 2. Relevant equations 3. The attempt at a solution I tried using (P1x)f + (P2x)f = (P1x)i + (P2x)i ----> (m1xv1x)f + (m2xv2x)f = (m1xv1x)i + (m2xv2x)i. I tried solving for (v1x)f. I assumed since the billiard balls are identical that the mass cancels out.