A fly wheel of moment of inertia 3 × 10^2 kg m^2 is rotating with uniform angular speed of 4.6 rad/s . It a torque of 6.9×10^2 N m retards the wheel, then the time in which the wheel comes to rest is

Q: A fly wheel of moment of inertia 3 × 102 kg m2 is rotating with uniform angular speed of 4.6 rad/s . It a torque of 6.9 × 102 N m retards the wheel, then the time in which the wheel comes to rest is

(a) 1.5 s

(b) 2 s

(c) 0.5 s

(d) 1 s

Ans: (b)