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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 inclined plane of inclination `theta` with a uniform velocity. The torque of the normal force on the block about its centre has a magnitude

A

zero

B

Mga

C

Mga `sintheta`

D

`(1)/(2)Mgasintheta`

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The correct Answer is:
D
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