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

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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 \( O \).
\( \mathrm{P} \) The angular speed of the block after it hits \( O \) is

W
[IIT-JEE 1999]
(a) \( 3 v / 4 a \)
(b) \( 3 v / 2 a \)
(c) \( \frac{\sqrt{3} v}{\sqrt{2} a} \)
(d) Zero
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