1. The problem statement, all variables and given/known data Assume an elastic collision (ignoring friction and rotational motion). A queue ball initially moving at 4.3 m/s strikes a stationary eight ball of the same size and mass. After the collision, the queue ball’s final speed is 2.3 m/s . Find the queue ball’s angle with respect to its original line of motion. v1i = 4.3 v1f = 2.3 2. Relevant equations p1i + p2i = p1f + p2f KEi = KEf 3. The attempt at a solution sqrt(4.3^2 - 2.3^2) = v2f = 3.6 m/s 4.3 = 2.3*cos θ + 3.6*cos φ (for x direction) 0 = 2.3*sin θ - 3.6*sin φ (for y direction) 2.3*sin θ = 3.6*sin φ Not quite sure how to proceed from here.