A wheel has moment of inertia `5 xx 10^(-3) kg m^(2)` and is making `20 "rev" s^(-1)`. The torque needed to stop it in `10 s` is….. `xx 10^(-2) N-m`

Options

A. `2 pi xx 10^(-2) N-m`
B. `2 pi xx 10^2 N-m`
C. `pi xx 10^(-2) N-m`
D. `4 pi xx 10^(-2) N-m`

Answer

A