An equilateral triangle 100.0 m on a side has a m1 = 15.00 kg mass at one corner, a m2 = 75.00 kg mass at another corner, and a m3 = 120.00 kg mass at the third corner. Find the magnitude and direction of the net force acting on the 15.00 kg mass.

Answer 1

Vectorially add the forces due to m2 and m3, acting upon m1. Use Newton's universal law of gravity for the individual forces.