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Find the acceleration of slid right circ...

Find the acceleration of slid right circular roller `A`, weighing `12kg` when it is being pulley by another weight `B (6 kg)` along the horizontal plane as in figure `(` pulley in massless `)`. The weight `B` is attached to the end of a string wound around the circularference of roller. Assume there is no slipping of the roller and the string is inextensible.

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