Rotational Motion: JEE Main 2020 Physics question

JEE Main 2020 · 4 Sep, Morning shift · Q53

JEE Main 20204 Sep, Morning shiftPhysicsHardRotational Motion140× since 2002

A circular disc of mass M and radius R is rotating about its axis with angular speed

{\omega _1}

. If another stationary disc having radius

{R \over 2}

and same mass M is droped co-axially on to the rotating disc. Gradually both discs attain constant angular speed

{\omega _2}

the energy lost in the process is p% of the initial energy. Value of p is __________.

Your answerType your answer. Integers and decimals are accepted.

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