A smooth inclined plane ends in a vertical circular loop, as shown in the figure. A small body is released from height h as shown. If the body exerts…

A smooth inclined plane ends in a vertical circular loop, as shown in the figure. A small body is released from height $\displaystyle h$ as shown. If the body exerts a force of three times its weight on the plane at the highest point of circle then the height $\displaystyle h=\alpha R$. The value of $\displaystyle \alpha$ is $\displaystyle \_\_\_\_$.