Use the problem statement below to answer questions $19$ to $2I$

For the arrangement shown in Fig. Q$19-21,$ a $4$ m by $4$ m square gate is used to stop the flow of water from a dam through the use of a block.

$19.$ What the bydrostatic force acting on the gate?

a$.1\mathrm{.}57$ MN

c$.1\mathrm{.}75$ MN

b$.1\mathrm{.}05$ MN

d$.1\mathrm{.}50$ MN

$20.$ How far is the center of pressure below the centroid of the gate?

a$.0\mathrm{.}3313$ m

$.0\mathrm{.}1333$ m

b$.0\mathrm{.}1313$ m

d$.0\mathrm{.}1569$ m

$21.$ What force does the gate exert on the block?