A disc is at rest at the top of a rough incined plane. It rolls without slipping. At the bottom of 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 of a rough incined plane. It rolls withou

1.	A disc is at rest at the top of a rough incined plane. It rolls without slipping. At the bottom of 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