As shown in figure BEF is a fixed vertic...

As shown in figure BEF is a fixed vertical circular tube. A block of mass m starts moving in the tube at point B with velocity V towards E. It is just able to complete the vertical circle. Then.

Velocity at B must be `sqrt(3Rg)`

velocity at F must be `sqrt(2Rg)`

Normal reaction at point F is 2 mg.

The normal reaction at point E is 6 mg.

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