A system consists of two particles. at t = 0 one particle is at the origin; the other, which has a mass of 0.50 kg, is on the y -axis at y = 6.0 m. At t = 0 the center of mass of the system is on the y -axis at y = 2.4 m. The velocity of the center of mass is given by (0.75 m/s³) t2i.