A cubical block of side \( a \) is moving with velocity \( v \) on a horizontal smooth plane as ....

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A cubical block of side \( a \) is moving with velocity \( v \) on a horizontal smooth plane as shown. It hits a ridge at point \( O \). The angular speed of the block after it hits \( O \) is
(1) \( 3 v /(4 a) \)
(2) \( 3 v /(2 a) \)
(3) \( \sqrt{3} v /(\sqrt{2} a) \)
(4) Zero


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