The masses and coordinates of three spheres are as follows: 20kg, x = 0.50 m, y = 1.0 m; 40 kg, x = – 1.0 m, y = – 1.0 m; 60 kg, x = 0m, y = – 0.50 m. What is the magnitude of the gravitational force on a 20 kg sphere located at the origin due to these three spheres?