A Disc with Moment of Inertia I₁ = 40 Kg $\omega$

question 37

Multiple Choice

A disc with moment of inertia I₁ = 40 kg.m² and angular velocity $\omega$ ₁ = 20 rad/s is dropped on to a stationary second disc along the axis of rotation.The second disc has moment of inertia I₂ = 60 kg.m².How much rotational kinetic energy is lost?

• A)3200 J
• B)4800 J
• C)8000 J
• D)11300 J
• E)15000 J

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