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[" 4.A disc of radius "2m" and mass "100...

[" 4.A disc of radius "2m" and mass "100kg" rolls on a "],[" horizontal floor.Its centre of mass has speed of "],[20cm/s" .How much work is needed to stop it? "],[qquad [" (1) "3J" ( "EET-2019]],[" (3) "2J," (2) "30kJ],[" (4) "1J]]

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