Three balls with masses of 3.0 kg, 1.0 kg, and 5.0 kg are located at coordinates (8.0m,8.5m), (8.5m,4.5m), and (4.5m,1.0m), respectively, and are connected by massless rods. What is the x-coordinate of the center of mass? For the three balls above, what is the y-coordinate of the center of mass?