A ring, a solid sphere and a thin disc of different masses rotate with the same

Question

A ring, a solid sphere and a thin disc of different masses rotate with the same kinetic energy. Equal torques are applied to stop them. Which will make the least number of rotations before coming to rest

Options:

A . Disc

B . Ring

C . Solid sphere

D . All will make same number of rotations

Answer: Option D
:
D
As

W = τ θ = E n e r g y \Rightarrow θ = \frac{E n e r g y}{τ} = 2 n π

So, if energy and torque are same then all the bodies will make same number of rotation.

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