A $2m$ long hydraulic prism with triangular cross$-$ moving within a V$-$channel at a constant speed of $0\mathrm{.}15\frac{m}{s}.$ The clearance between the prism and the tube is filled with oil having a specific gravity of $0\mathrm{.}85$ and a kinematic viscosity of $3\mathrm{.}5*{10}^{-4}\frac{m^2}{s}.$ Determine the thickness, $h$ of the oil if the prism is pushed by a force of $10N.$