1. The problem statement, all variables and given/known data A ball with an initial speed of v1 = 21.5 m/s collides elastically with two identical balls whose centers are on a line perpendicular to the initial velocity and that are initially in contact with each other. The first ball is aimed directly at the contact point and all motion is frictionless. >What is the speed of ball 1 after the collision? >What is the speed of ball 2 after the collision? 2. Relevant equations m1v1i + m2v2i = m1v1fcos(θ) + m2v2fcos(θ) KE = 1/2 mv12 + 1/2 mv22 3. The attempt at a solution So I know that the velocities have two components, x and y. I also know that at the collision point, the angle of the centers of mass are 30° (since the balls form an equilateral triangle). For the x-component, I tried using the conservation of momentum equation above with cos(30°) and using the KE equation to substitute for unknown values of v1 and v2. For the y-component I tried doing the same, but since the original velocity in the y-component is 0, I used 0 = m1v1sin(θ) + m2v2sin(30). For θ I tried 30, 60, and 180, but none of them worked. Now I'm a bit stuck and I'm getting confused from all the variables I'm trying here. Any direction is appreciated!