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A hoop of radius 2 m weighs 100 kg. It r...

A hoop of radius 2 m weighs 100 kg. It rolls along horizontal floor so that its centre of mass has a speed of `20 cm s^(-1)`. How much work has to be done to stop it?

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Total energy ` = K_("trans") + K_("rot") = (1)/(2)mv^(2) + (1)/(2)Iomega^(2)`
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