Solve the Problem $4 \mathrm {~m}$ And Height $2 \mathrm {~m}$ Is Submerged Vertically, as Shown Below

Multiple Choice

Solve the problem.
-A right triangular plate of base $4 \mathrm {~m}$ and height $2 \mathrm {~m}$ is submerged vertically, as shown below. Find the force on one side of the plate if the top vertex is $1 \mathrm {~m}$ below the surface. ( $\mathrm { w } = 9800 \mathrm {~N} / \mathrm { m } ^ { 3 }$ )

A) 85,000 N
B) 52,000 N
C) 78,000 N
D) 170,000 N