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[" 21.A hoop of radius "2m" weighs "100k...

[" 21.A hoop of radius "2m" weighs "100kg" .It rolls along a "],[" horizontal floor so that its centre of mass has a speed of "],[20cm/s" .How much work has to be done to stop it? "],[[" (a) "3" ."," (b) "4]]

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