A disc of radius \( 10 \mathrm{~cm} \) is rotating about its axis a...

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A disc of radius \( 10 \mathrm{~cm} \) is rotating about its axis at an angular speed of \( 20 \mathrm{rad} / \mathrm{s} \). Find the linear speed of a point on the rim,
(1) \( 1 \mathrm{~m} / \mathrm{sec} \)
(2) \( 4 \mathrm{~m} / \mathrm{sec} \)
(3) \( 2 \mathrm{~m} / \mathrm{sec} \)
(4) none of these
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