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A circular disc A of radius r is made f...

A circular disc `A` of radius `r` is made from an iron plate of thickness `t` and another circular disc `B` of radius `4r` is made from an iron plate of thickness `t//4`. Equal torques act on the discs `A` and `B`, initially both being at rest. At a later instant, the linear speeds of a point on the rim of `A` and another point on the rim of `B` are `v_(A)` and `v_(B)`, respectively. We have

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