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ive using a formula l x e = y

l being length or depth in this case

e being value of water which i found to be 1 x 10 to power of 3 kg/m3

y being the pressure at the centroid

so in my case thats 5 x 1x10powerof 3= 50000n/m2

the to work out force on the plate ive used

pressure x area

so 50000 x 5 = 250Kn

have i gone horribly wrong?? doesnt seem right to me