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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

A
Disc
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B
Ring
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C
Solid sphere
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D
All will make same number of rotations
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Solution

The correct option is D All will make same number of rotations
As W=τθ=Energyθ=Energyτ=2nπ
So, if energy and torque are same then all the bodies will make same number of rotation.

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