Question

3 particles,each of mass M are situated at the vertices of an
equilateral triangle of the side a.The only forces acting on
the particles are their mutual gravitational forces.It is
desired that each particle move in a circle,while maintaining
the original mutual separation a.Then the initial velocity
that should be given to each particle is

Answer 1

Each of these particles will apply force \(2F_g*\cos30\)
So, \( \frac{mv^2}{r} = 2F_g*\cos 30 \)