Physics

Problem

A wheel is initially rotating at

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

in the anticlockwise sense. It is subjected to a constant angular acceleration of

-4\,\text{rad}\,\text{s}^{-2}

. How much time will it take for the wheel to come to rest? a)

4\,\text{s}

10\,\text{s}

5\,\text{s}

2.5\,\text{s}