The figure shows two blocks that slide toward each other on a frictionless table. The blocks are made of a very hard and non-sticky material. Block A has a mass m_A = 6.0 kg and block B has a mass m_B = 4.0 kg. Block A has an initial speed of 5.0 m/s and block B has an initial speed of 3.0 m/s. What are their velocities after the head-on collision? Use the coordinate system at the bottom of the figure.