$2.[8$ marks$]$ A $1\mathrm{.}75$ meter plug seals off a discharge pipe in a reservoir as shown below. The bottom edge of the plug is flush with the inside surface of the reservoir wall at a depth of $4\mathrm{.}2$ meters. Determine the magnitude and location of the resultant force acting on the plug. State the distance to the center of pressure as a vertical depth from the water surface.