Find the Fluid Force Exerted Against the Vertically Submerged Flat $500 w$

Multiple Choice

Find the fluid force exerted against the vertically submerged flat surface depicted in the diagram. Assume arbitrary
units, and call the weight-density of the fluid w.
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A) $500 w$
B) $250 \mathrm { w }$
C) $\frac { 375 } { 2 } w$
D) $375 w$