2 A wall holds back water in a reservoir as shown in the figure Some of the water is below ground level to a depth h but the above ground wall increases the amount of water that can be stored For all parts of this problem the height of the wall h 2 5 m and the depth of the water below ground h 2 m hw wall ha V hg ground level Figure for problem 2 a a Typically the water level in this particular reservoir is at height he shown in the figure If ha 2 m find the total force of the water on the wall if its length perpendicular to this cross section is 30 m Find the center of pressure of this force