$2\mathrm{.}8\mathrm{.}26$ The dam shown in Fig. P$2\mathrm{.}8\mathrm{.}26$ is $61$ m long and is made

of concrete with a specific gravity of $2\mathrm{.}2.$ Find the magnitude and $y$

coordinate of the line of action of the net horizontal force.

FIGURE P$2\mathrm{.}8\mathrm{.}26$