Three balls with masses of 5 g, 1 g, and 7 g, respectively, are connected by massless rods. The balls are located (in meter intervals) as in the figure. Imagine the first quadrant of a graph. The 5 gram is at point (3,8) The 7 gram is at point (5,2) The 1 gram is at point (9,6) What do do to find the center of gravity? I've looked online and I only see formulas for 2 objects instead of 3 so I'm stuck. Forgot to say they are all connected by massless rods.