A disc of radius r rotates about it centre with an angular speed ω0. If it is gently placed on a rough horizontal surface, the time after which it will start pure rolling is
1
\(x = {-b \pm \sqrt{b^2-4ac} \over 2a}\)\(\frac{5}{2} \frac{\omega_0 r}{\mu g}\)
2
\(\frac{\omega_0 r}{3 \mu g}\)
3
\(\frac{3}{2} \frac{\omega_0 r}{\mu g}\)
4
\(\frac{\omega_0 r}{\mu g}\)
5
Question Not Attempted