2.24 A block 0.1 m square, with 5 kg mass, slides down a smooth incline, 30 below the horizontal, on a film of SAE 30 oil at 20 C that is 0.20 mm thick. If the block is released from rest at t =0, determine its initial acceleration. Derive an expression for the speed of the block as a function of time. Plot the curve for V t . Find the speed after 0.1 s. If we want the mass to instead reach a speed of 0 3m s at this time, find the viscosity μ of the oil we would have to use.