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A cubical block of mass \( M \) and edge \( a \) slides down a rough inclined plane of inclination \( \theta \) with a uniform
\( \mathrm{P} \) velocity. The torque of the normal force on the block about its centre has a magnitude
W
(a) zero
(b) Mga
(c) \( M g a \sin \theta \)
(d) \( \frac{1}{2} M g a \sin \theta \).
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