138 A disc is at rest at the top of a rough incined plane It rolls without slipping At the bottom of inclined palne there is a

Question

138 A disc is at rest at the top of a rough incined plane It rolls without slipping At the bottom of inclined palne there is a vertical groove of radius R In order to loop the groove the minimum height of incline required is 1 15R 4 2 9R 4

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