hey @karthik
FRICTION IS AN EXTERNAL FORCE SO TORQUE BY IT WOULD BE EXTERNAL
BUT IF WE CONSERVE ANGULAR MOMENTUM ABOUT BOTTOMMOST POINT THE TORQUE BY FRICTION BECOMES ZERO (AS FRICTIONAL FORCE PASSES THRU BOTTOMMOSTPOINT) & HENCE NOW ANGULAR MOMENTUM CAN BE CONSERVED
KARTHIK THE FORMULA WHICH YOU HAVE APPLIED MVR + IW IS ABOUT THE BOTTOMMOST POINT(NOT ABOUT THE CENTRE WHICH U THOUGHT 
)
HOPE YOU UNDERSTOOD
CHEERS!!!!!!!!!!!!!!!!!!!!
Moderation Team
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