A block of mass m, placed on a horizontal surface is being pushed by a force F making an angle $\mathrm{\theta }$ with the vertical. The coefficient of friction between block and the surface is µ. The force required to slide the block with uniform velocity on the floor is

• A

  $\frac{\mathrm{\mu mg}}{(\sin \mathrm{\theta }-\mathrm{\mu cos}\mathrm{\theta })}$

• B

  $\frac{(\sin \mathrm{\theta }-\mathrm{\mu cos}\mathrm{\theta })}{\mathrm{\mu mg}}$

• C

  $\frac{\mathrm{\mu mg}}{(\sin \mathrm{\theta }+\mathrm{\mu cos}\mathrm{\theta })}$

• D

  $\frac{(\sin \mathrm{\theta }+\mathrm{\mu cos}\mathrm{\theta })}{\mathrm{\mu mg}}$