JEE Main 30-Jan-2024 Shift 1 Solved Paper

Consider a Disc of mass 5‌kg, radius 2m, rotating with angular velocity of 10‌rad∕ s about an axis perpendicular to the plane of rotation. An identical disc is kept gently over the rotating disc along the same axis. The energy dissipated so that both the discs continue to rotate together without slipping is______ J.