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A soldi sphere a hollow sphere and a dis...

A soldi sphere a hollow sphere and a disc, all haing 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

A

the solid sphere

B

the ring

C

the disc

D

all will take the same time

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The correct Answer is:
D
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