The mass of ball a is 10 kilograms and the mass of ball b is 5 kilograms. if the initial velocity is set to 3 meters per second for each ball, what is the final velocity of ball b if the final velocity of ball a is 2 meters per second? use the elastic collision equation to find the final velocity of ball b. assume ball a initially moves from right to left and ball b moves in the opposite direction. identify each mass, velocity, and unknown. show your work, including units, and indicate the direction of ball b in your answer.