Rotational MotionHard
Question
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
Options
A.3v / 4a
B.3v / 2a
C.√3 / 2a
D.zero
Solution
R =
or r2 = 
Net toeque abou O is zero
Therefore, angular momentum (L) about O will be conseved
or Li = Lf
Mv
= I0(ICM + Mr2)ω
=
ω = 
M a ω ω ω =
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