Two discs of moment of inertia I 1 and I 2 and angular speeds 
are rotating along collinear axes passing through their centre of mass and perpendicular to their plane. If the two are made to rotate together along the same axis the rotational KE of system will be
A
B
C
D
None of these
Text Solution
Verified by ExpertsThe correct answer is:
C
By the law of conservation of angular momentum 
Angular velocity of system 
Rotational kinetic energy 
.
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