A Cubical block of mass \( \mathrm{M} \) and edge a slides down a r...

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A Cubical block of mass \( \mathrm{M} \) and edge a slides down a rough inclined plane of inclination \( \theta \) with a
\( \mathrm{P} \) uniform velocity. The torque of the normal force on

W the block about its centre has a magnitude.
(1) zero
(2) \( M g a \)
(3) \( M g a \sin \theta \)
(4) \( \frac{1}{2} M g a \sin \theta \)
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