A block has been placed on an inclined plane. The slope angle \( \theta \) of the plane is such ...

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A block has been placed on an inclined plane. The slope angle \( \theta \) of the plane is such that the block slides down the plane at a constant speed. The coefficient of kinetic friction is equal to
(a) \( \sin \theta \)
(b) \( \cos \theta \)
(c) \( g \)
(d) \( \tan \theta \)
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