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A spool of inner radius R and outer radi...

A spool of inner radius `R` and outer radius `3R` has a moment of inertia `= MR^(2)` about an axis passing through it's geometric centre, where `M` is the mass of the spool. A thread wound on the inner surface of the spool is pulled horizontally with a constant force `= Mg`. Find the acceleration of the point on which is being pulled assuming that the spool rolls purely on the floor.
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