20. A ball of mass 6.0 kg, moving at 4m/s eastward, strikes head-on a ball of mass 20kg that is moving at 4m/s westward. The balls stick together after the impact. I Physics Semester 2 Final, 2020-2021 a What is the momentum of the first ball? b. What is the momentum of the second ball? c. What is the final velocity of the combined mass after the collision? d. What was the impulse for each ball? . ​