A disc of moment of inertia 9.8/π^2 kg m^2 is rotating at 600 rpm. If the frequency of rotation change from 600 rpm to 300 rpm, then what is the work done

Q: A disc of moment of inertia 9.8/π2 kg m2 is rotating at 600 rpm. If the frequency of rotation change from 600 rpm to 300 rpm, then what is the work done

(a) 1467 J

(b) 1452 J

(c) 1567 J

(d) 1632 J

Ans: (a)