A 35 -gram stainless steel ball on a track is moving at a velocity of 9 meters per second On the same track, a 75 -gram stainless steel ball is moving at a velocity of 7 meters meters per second After colliding, the 35 -gram ball moves at a velocity of 15 meters meters per second Assume there is no net force on the system. What is the velocity of the 75 -gram ball after the collision? Round to the nearest tenth.