An experiment was set-up to measure an unknown fluid's viscosity. two flat plates are separated by a gap of 4.5 mm and move relative to each other at a velocity of 5 m/s. the space between them is occupied by the unknown viscosity. the motion of the plates is resisted by a shear stress of 10 pa due to the viscosity of the fluid. assuming that the velocity gradient of the fluid is constant, determine the coefficient of viscosity of the fluid.