A compact disc spins at when the motor is turned off

PHYSICS · Subjective · CBSE · Physics · System of Particles and Rotational Motion · System of Particles and Rotational Motion

Problem

A compact disc spins at

480\,\text{rev/min}

when the motor is turned off. The disc experiences a constant angular deceleration and completes

300\,\text{rev}

before coming to rest. Determine (a) the magnitude of the angular deceleration in

\text{rad/s}^2

and (b) the time it takes for the disc to stop.