Three objects A,B,C are placed 50.0 cm apart along a straight line. A and B have a mass of 10.0 kg, while c has a mass of 15.0 kg. The objects are floating in deep space.

Question

a) what is the net force on B due to A and C

Answer 1

Since C has greater mass, and all are the same distance, the net force will be in the direction of C
F_ac = G*10*10/.50^2
F_bc = G*10*15/.50^2
Now just subtract

Answer 2

would F_ac distance be 1 meter instead of .50