A 5 kg ball (Ball A) traveling to the right at 4 m/s collides with a 2 kg ball (Ball B) at rest. After the collision, the 2 kg ball (Ball B) is…

A 5 kg ball (Ball A) traveling to the right at 4 m/s collides with a 2 kg ball (Ball B) at rest. After the collision, the 2 kg ball (Ball B) is traveling to the right at 5.714 m/s. What is the final velocity of Ball A?