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A solid sphere spinning about a horizontal axis with an angular velocity $\omega$ is placed on a horizontal surface. Subsequently it rolls without slipping with an angular velocity of
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The correct answer is:
$2 \omega / 7$
From cons. of anguler momentum about $\mathrm{A}$
$\Rightarrow v=\frac{2 R w}{7}$
$\Rightarrow W^{\prime}=\frac{2 w}{7}$
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