Q.

A solid sphere, a spherical shell, a ring and a disc of same radius and mass are allowed to roll down an inclined plane without slipping. The one which reaches the bottom first is

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a

Solid sphere

b

Ring

c

Spherical shell

d

Disc

answer is A.

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Detailed Solution

t=2hg sin2θ1+K2R2

Body of smaller K2R2 will take less time. so solid sphere will reach the ground first.

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A solid sphere, a spherical shell, a ring and a disc of same radius and mass are allowed to roll down an inclined plane without slipping. The one which reaches the bottom first is