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A disc of mass m and radius R rotating w...

A disc of mass `m` and radius `R` rotating with angular speed `omega_(0)` is placed on a rough surface (co-officient of friction `=mu`). Then

A

The angular momentum of disc is conserved about centre of disc

B

The angular momentum of disc is conserved about point of contact of disc.

C

Initially the force of fricition acting on the disc is `mu mg` leftward.

D

Initally the force of friction acting on the disc is `mu mg` rightward

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