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A cubical block of mass m and edge a sli...

A cubical block of mass m and edge a slides down a rough inclned plane of inclination `theta` with a uniform speed. Find the torque of the normal force acting on the block about its centre.

A

zero

B

Mga

C

Mgasinθ

D

1/2Mgasinθ

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The correct Answer is:
A
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