A block of mass $m$ is lying on an inclined plane. The coefficient of friction between the plane and the block is $\mu$. The force $(F_1)$ required to move the block up the inclined plane will be
A$mg\, \sin \theta + \mu mg\, \cos \theta$
B$mg\, \cos \theta -\mu mg\, \sin \theta$
C$mg\, \sin \theta -\mu mg\, \cos \theta$
D$mg\, \cos \theta + \mu mg\, \sin \theta$
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A$mg\, \sin \theta + \mu mg\, \cos \theta$
a $F=f+\mathbf{m g} \sin \theta=\operatorname{mg}(\mu \cos \theta+\sin \theta)$
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