A cord is wound round the circumference of a wheel of radius r. The axis of the wheel is horizontal and its moment of inertia about this axis is I. A weight mg is attached to the end of the cord and is allowed to fall from rest. The angular velocity of the wheel, when the weight has fallen through a distance h, is

Options

A. `[(2gh)/(l+mr)]^(1//2)`
B. `[(2mgh)/(I+mr^(2))]^(1//2)`
C. `[(2mgh)/(1+2mr^(2))]^(1//2)`
D. `(2gh)^(1//2)`

Answer

B