A disc is at rest at the top a rough incined plane. It rolls without. At the bottom of the inclined plane there is a vertical groove of radius 'R'. In order to loop the groove, the minimum height of incline required is

A disc is at rest at the top a rough incined plane. It rolls without.

1.	A disc is at rest at the top a rough incined plane. It rolls without. At the bottom of the inclined plane there is a vertical groove of radius 'R'. In order to loop the groove, the minimum height of incline required is
Answer» `(15R)/(4)` `(9R)/(4)` `(5R)/(2)` `(7R)/(5)` ANSWER :A