If a disc of radius R /2 is cut from a disc of radius R and mass M then what is the mass of

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If a disc of radius R /2 is cut from a disc of radius R and mass M then what is the mass of cutted disc ?
Ans. 𝑀/4

If a disc of radius R /2 is cut from a disc of radius R and mass M then what is the shift of centre of mass ?
Ans. Shift = 𝑅/6
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