9) (12 points) A trapezoidal plate, with 9111 and 5m bases and 3m height, is submerged vertically in a tank of water so that its top is 2m to the water surface (as gure below). Calculate the hydrostatic force against one side of the plate. (Water mass density p = 1000 kg/m3, and g = 9.8 m/sZ) 5m 2M\" [an '(m 10