A circular, solid disc of radius \( R \) and mass \( 2M \) is rotating with angular velocity \( \omega \). A second disc of radius \( R \) and mass \( M \) is dropped onto the rotating disc, and the two slide against each other until they reach the same final angular velocity. (a) What is the final angular velocity of the discs? (b) What percentage of the initial kinetic energy (KE) was lost during the collision?

Let m1 and m2, and I1 and I2 denote the masses and moments of inertia of the two discs. Let I denote…

Answered: A circular, solid disc of radius R and…

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