When a body is placed on a rough plane inclined at an angle $\theta $ to the horizontal, its acceleration is
  • A$g(\sin \theta - \cos \theta )$
  • B$g(\sin \theta + \mu \cos \theta )$
  • C$g(\mu \sin \theta  - \cos \theta )$
  • D$g\mu (\sin \theta - \cos \theta )$
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