Published by:
CGP EDU Academic Team
Published on: August 12, 2026
A circular disc of mass 
and radius 
is rotating about its axis with angular speed 
. If another stationary disc having radius 
and same mass 
is droped co-axially on to the rotating disc. Gradually both discs attain constant angular speed 
the energy lost in the process is 
of the initial energy. Value of 
is
Text Solution
Verified by ExpertsThe correct answer is:
20
(20) 
loss of K.E. 
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