JEE Main 2019 — Rotational Motion Question with Solution
From: JEE Main 2019 (Online) 10th April Morning Slot
Question
Two coaxial discs, having moments of inertia
I1 and I1/2, are rotating with respective angular
velocities 1 and
1/2
, about their common axis.
They are brought in contact with each other and
thereafter they rotate with a common angular
velocity. If Ef and Ei are the final and initial total
energies, then (Ef - Ei) is:
Choose an option
Show full solutionCorrect option: A
Correct answer
A
Step-by-step explanation
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This is a previous-year question from JEE Main 2019, covering the Rotational Motion chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.