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[" 7.A circular disc of radius "20cm" is...

[" 7.A circular disc of radius "20cm" is cut from one "],[" edge of a larger circular disc of radius "50cm.],[" The shift of centre of mass is "],[[" 1) "5.7cm," 2) "-5.7cm," 3) "3.2cm,4" ) "-3.2cm]]

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