$\begin {array} {1 1} (1)\;(D) & \quad (2)\;(C) \\ (3)\;(B) & \quad (4)\;(A) \end {array}$

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Q)

(A) Force of friction between the rims will disappear when the disc rotate with same angular speeds.
(B) Force of friction between the rims will disappear when they have equal linear velocities.
(C) Angular Momentum of the system is conserved
(D) Rotational Kinetic Energy of the system is conserved.

$\begin {array} {1 1} (1)\;(D) & \quad (2)\;(C) \\ (3)\;(B) & \quad (4)\;(A) \end {array}$

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