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A solid sphere, a hollow sphere and a disc, all having same mass and radius, are placed at the top of an incline and released. The friction coefficients between the objects and the incline are same and not sufficient to allow pure rolling. Least time will be taken in reaching the bottom by

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The solid sphere
The hollow sphere       
The disc
All will take same time

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detailed solution

Correct option is D

As friction is not sufficient to allow rolling, all the bodies will slip down

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