$A$ block of mass $M$ is sliding down an inclined plane. An external force $F$ is applied vertically downwards on the block. The coefficient of static friction is $\mu_s$ and the coefficient of kinetic friction is $\mu_k$. The friction force acting on the block is:
- A$\mu_s Mg \cos \theta$
- B$(F+Mg) \sin \theta$
- C$\mu_k (F+Mg) \cos \theta$
- D$(Mg+F) \tan \theta$
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