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A cube of mass $m$ slides down an inclined right-angle trough. If the coefficient of kinetic friction between the cube and the trough is $\mu _k$ , then the acceleration of the block is 
  • A$g\left( {\sin \theta  - {\mu _k}\cos \theta } \right)$
  • B$\sqrt 2 g\left( {\sin \theta  - {\mu _k}\cos \theta } \right)$
  • C$\frac{1}{{\sqrt 2 }}g\left( {\sin \theta  - {\mu _k}\cos \theta } \right)$
  • D$g\left( {\sin \theta  - {\mu _k}\sqrt 2 \cos \theta } \right)$
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