*Problem 1: There are two fixed heavy masses of magnitude M of high density on x-axis at a distance 2d apart. A small mass m moves in a circle of radius R in the y-z plane between the heavy masses. Find the speed of the small particle.*

*Solution :*

Force of attraction between M and m is

By symmetry F_{x} components will cancel.

** ∴** The net force, which provides the centripetal force, is given by

As net force provides the centripetal force . Therefore ,