A solid spherical ball of mass m is rele...

A solid spherical ball of mass m is released from the topmost point of the shown semi - spherical shell. The track is sufficiently rough to enablle to enable pure rolling motion. The normal force between the ball and the shell at the lowest position is

`(12)/(7)mg`

`(7)/(9)mg`

`(17)/(7)mg`

`(10)/(7)mg`

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