A square plate with 0.5m side length is placed in a water tank so that its centroid is in a depth of
2.9m. If the flat surface of plate is placed in vertical plan and top edge is parallel to the free
surface, calculate the distance to the horizontal pressure force acting on one side of the surface
from the free surface.
(a) 2.907 m
(b) 3.000 m
(c) 2.900 m
(d) 3.010 m