Question No$\mathrm{.}16$: A rectangular pontoon $10$ m long, $6$ m broad, $2\mathrm{.}5$ m deep weighs $687\mathrm{.}6$ kN$.$ It carries on its upper deck an empty boiler of $5$ m diameter weighing $588\mathrm{.}6$ kN$.$ The center of gravity of the boiler and the pontoon are at their respective centers along a vertical line. Find the metacentric height. Weight density of sea water is $10\mathrm{.}104$ kN$/$m$3..$