Three objects are situated along the y-axis. Their masses and positions are: An object of mass m1=2.80 kg at position y1=-0.200 m; an object of mass m2=2.40 kg at position y2=3.30 m; and an object of mass m3=3.40 kg at position y3=-3.60 m. Determine the position in m along the y-axis of the center of mass of the objects.