NEET PhysicsClass 11Angular momentum and its conservationHardSingle correct

A disc with moment of inertia I spins freely at ω₀ about a frictionless vertical axle. A second disc, at rest and with moment of inertia 2I about the same axle, is dropped gently onto it, and the two soon rotate together. What fraction of the initial kinetic energy is lost?

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A disc with moment of inertia I spins freely at ω₀ about a frictionless vertical axle. A second disc, at rest and with moment of inertia 2I about the same axle, is dropped gently onto it, and the two soon rotate together. What fraction of the initial kinetic energy is lost?

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