A uniform disc of radius R is put over another uniform disc of radius 2R of same thickness and density. The peripheries of the two discs touch each other. The position of their centre of mass is

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at R/3 from the centre of the bigger disc towards the centre of the smaller disc

at R/5 from the centre of the bigger disc towards the centre of the smaller disc

at 2R/5 from the centre of the bigger disc towards the centre of the smaller disc

none of the above

answer is B.

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Detailed Solution

for uniform disc, distance from centre of bigger disc is

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