Question

A 1.00 kg particle has the xy coordinates (-1.00 m, 1.00 m) and a 2.00 kg particle has the xy coordinates (0.800 m, -0.800 m). Both lie on a horizontal plane. At what (a) x and (b) y coordinates must you place a 3.00 kg particle such that the center of mass of the three-particle system has the coordinates (-0.400 m, -0.500 m)?