A flywheel slows down uniformly from an initial angular speed of to rest in

PHYSICS · Single correct · CBSE · Physics · System of Particles and Rotational Motion · System of Particles and Rotational Motion

Problem

A flywheel slows down uniformly from an initial angular speed of

20\,\text{rad s}^{-1}

to rest in

4\,\text{s}

. What is the magnitude of its average angular velocity during this interval? (a)

12.5\,\text{rad s}^{-1}

(b)

5\,\text{rad s}^{-1}

(c)

10\,\text{rad s}^{-1}

(d)

20\,\text{rad s}^{-1}