My number in class is 31

1 This is a protocol question. You must submit the knowns, the unknown, the equation/s, the equation work with check-check-question mark, the set-up, calculations, and the boxed answer-including units every step of the way. Keep your work organized, and you will be reminded of the need to submit your answer . about a minuter before time runs out. Question 1: Ball A of mass 5.00 kilograms moving at 20.0 meters per second collides with ball B of unknown mass moving at 10.0 meters per second in the same direction. After the collision, ball A moves at 10.0 meters per second and ball B at 15.0 meters per second, both still in the same direction. What is the mass of ball B? [Remember, the actual mass you must use for ball A is 5.00 kilograms plus your number in class]. F__