A uniform disc of mass 
and radius 
is rotating at 
about a perpendicular axis passing through its centre. A boy of mass 
standing at the centre of the disk suddenly jumps to a point which is 
from the centre of the disc. The final angular velocity of the boy (in rad/s) is
Text Solution
Verified by ExpertsThe correct answer is:
A
Since no external torque, so angular momentum is conserved
Therefore final angular velocity,
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