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A solid homogeneous sphere is moving on ...

A solid homogeneous sphere is moving on a rough horizontal surface, partily rolling and partially sliding. During this kind of motion of the sphere.

A

Total kinetic energy is conserved

B

Angular momentum of sphere about the point of contact is conserved

C

Only the rotational kinetic energy about the centre of mass is conserved

D

Angular monentum about the centre of mass is conserved

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The correct Answer is:
B
Since all the forces pass through point of contact only angular momentum remains constant
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