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Consider a disc of mass m and radius R p...

Consider a disc of mass `m` and radius `R` placed on a rough plank of mass `M` which is turn is place on a smooth horizontal surface. Now plank is pulled by a force `F` and disc starts to roll on the plank.
If there is no friction any where then find
`(a)` Fricition force acting on the disc
`(b)` Angular acceleration of the disc

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