A vertical rectangular plane surface is submerged in water such that its top and bottom surfaces are 1.5 m and 6.0 m res-pectively below the free surface. The position of center of pressure below the free surface will be at a distance of | Fluid Mechanics Questions

a)    3.75 m
b)    4.0 m
c)    4.2m
d)    4.5m
Ans: c