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 DAll will make same number of rotations As W=τθ=Energy⇒θ=Energyτ=2nπ So, if energy and torque are same then all the bodies will make same number of rotation.