A 3.00-kg ball moves at a speed of 4.00 m/s toward the right. It collides elastically with a 6.00-kg ball that is initially at rest. Define the positive direction of motion as pointing to the right. Determine the velocity U2,f of the 3.00-kg ball after the collision. U2.f = m/s Determine the velocity v4,f of the 6.00-kg ball after the collision. VAf = m/s