A non uniform ball of mass M and radius R, rolls from rest down a ramp and onto a circular loop of radius r. The ball is initially at height h above the bottom of loop. At the bottom of loop the normal force on ball is twice its weight. Moment of inertia of ball is given by  $I=\beta M{R}^2$. Find  $\beta$ (Assume h>>R and r>>R) (centre of mass of ball will lie at it’s centre)