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Which of the following will reach first ...

Which of the following will reach first on ground if objects are of same mass and radius are under pure rolling.

A

RING

B

CYLINDER

C

DISC

D

SOLID SPHERE

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The correct Answer is:
D
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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. The smallest kinetic energy at the bottom of the incline will be achieved by

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