1. The problem statement, all variables and given/known data Calculate the work against gravity required to build a structure out of brick. The structure has a square base with 10ft sides and is 20ft high. The density of brick is around 80lb/ft^3 2. Relevant equations W=∫F*d 3. The attempt at a solution First I found the volume where V=(102) Δy Then I found the mass=(ρ)(V)=(80)(102) Δy Then I found the force=(gravity)(m)=(32.2)(80)(102) Δy Then I integrated between 0 and 20 with respect to y=∫(32.2)(80)(102)y dy which gave me 128800y2 between 0 and 20= 51520000 ft*lb my answer is not correct and I'm not sure if I'm computing properly.