Question:

Two discs of moment of inertia I1 = 4 kg m² and I2 = 2 kg m² about their central axes & normal to their planes, rotating with angular speeds 10 rad/s & 4 rad/s respectively are brought into contact face to face with their axe of rotation coincident. The loss in kinetic energy of the system in the process is_____J. 

                                                JEE-2024

Solution:                
Two discs of moment of inertia I1 = 4 kg m² and I2 = 2 kg m² about their central axes & normal to their planes, rotating with angular speeds 10 rad/s & 4 rad/s respectively are brought into contact face to face with their axe of rotation coincident. The loss in kinetic energy of the system in the process is_____J. JEE-2024

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