A circular disc is rotating about its own axis at constant angular acceleration. If its angular velocity increases from 210 rpm to 420 rpm during `21` rotations then the angular acceleration of disc is

Options

A. `5.5rad//s^(2)`
B. `11 rad//s^(2)`
C. `16.5 rad//s^(2)`
D. `22 rad//s^(2)`

Answer

A

Explanation

`alpha=(omega_(2)^(2)-omega_(1)^(2))/(2 theta)`