Answer to Question #49251 in Mechanics | Relativity for Paromita Mukherjee

Four particles A,B,C,D each of mass m are kept at the corners of a square of side L. Now the particle D is taken to infinity by an external agent keeping the other particle fixed at their respective positions. The work done by the gravitational force acting on the particle D during its movement is?
Ans= -2Gm^2/L * [(2√2 +1)/√2]