A square-shaped board (1 m 1 m) with weight of 16 N slides down a 30 o - inclined ramp with a terminal velocity of 22.5 mm/s. Between the board and the ramp there is a 1-mm-thin film of oil with specific weight of 8 kN/ 3 m . Assume the oil is a Newtonian fluid, and a linear velocity profile applies to the oil film. Determine the kinematic viscosity of the oil.