A ring of radius 4a is rigidly fixed in ...

A ring of radius 4a is rigidly fixed in vertical position on a table. A small disc of mass m and radius a is released as shown in the fig. When the disc rolls down, without slipping, to the lowest point of the ring, then its speed will be

`sqrt(ga)`

`sqrt(2ga)`

`sqrt(3ga)`

`sqrt(4ga)`

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