A cubical block of side \( a \) moving with velocity \( v \) on a h...

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A cubical block of side \( a \) 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 \( (1999,2 \mathrm{M}) \)
\( P \)
W
(a) \( 3 v / 4 a \)
(b) \( 3 v / 2 a \)
(c) \( \sqrt{3} / \sqrt{2} a \)
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