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A horizontal rotating disc placed on aro...

A horizontal rotating disc placed on arough surface has an angular speed of 8 rad`//`s when it is lowered on the surface. After 3 seconds, it is observed to have an angular speed of 2.6 rad`//`s. How many revolutions it made from the time of lowering`on the surface until it stops ? Assume the pressure on the surface due to disc is uniform on its area.

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The correct Answer is:
[2.83]
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PHYSICS GALAXY - ASHISH ARORA-RIGID BODIES AND ROTATIONAL MOTION-Unsolved Numerical
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