Home JEE Main - Previous Year Papers JEE MAIN 2020 PAPER-8 Two uniform circular discs are rotating inde…
JEE Main - Previous Year Papers JEE MAIN 2020 PAPER-8 Single Correct MCQ
Published on: August 13, 2026

Two uniform circular discs are rotating independently in the same direction around their common axis passing through their centres. The moment of inertia and angular velocity of the first disc are and respectively while those for the second one are and respectively. At some instant they get stuck together and start rotating as a single system about their common axis with some angular speed. The Kinetic energy of the combined system is:

A
B

C
D

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The correct answer is:
D


Now find

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