A disc of moment of inertia `2 kg m^(2)` is acted upon by a constant torque of 40 Nm. If it is initially at rest, then the time taken by it to acquire an angular velocity 100 rad/s will be

Options

A. 20 s
B. 10 s
C. 5 s
D. 4 s

Answer

C

Explanation

`t=(I(Delta omega))/(lambda)=(2xx100)/(40)=5` sec.