A cubical block of side \( a \) and density \( \rho \) slides over a fixed inclined plane with c...

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A cubical block of side \( a \) and density \( \rho \) slides over a fixed inclined plane with constant velocity \( v \). There is a thin film of viscous fluid of thickness \( t \) between the plane and the block. Then the coefficient of viscosity of the film will be
(a) \( \frac{3 \rho a g t}{5 v} \)
(b) \( \frac{4 \rho a g t}{5 v} \)
(c) \( \frac{\rho a g t}{v} \)
(d) None of these
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