A cubical block of side a is moving with velocity v on a horizontal smooth plane as shown in figure. It hits a ridge at point O. The angular speed of the block after it hits O is
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a
3v(4a)
b
3v(2a)
c
3v2a
d
zero
answer is A.
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Detailed Solution
Apply conservation of angular momentum about OMva2 = [Ma26+M(a2)2]ω⇒ω = 3v4a