While slippling a on rough spherical sur...

While slippling a on rough spherical surface of radius 'R' , block A of mass 'm' comes with velocity `sqrt(1.4 gR)` at bottom B. Work done in slippling the block from 'B' to 'C' is

`(mgR)/4`

mgR

1.3 mgR

`5/4` mgR

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