Here is the question:
I have posted a link there to this thread so the OP can see my work.How much work is required to pump the water out of the trough when it is full?
A trough has a trapezoidal cross section with a height of 5m and horizontal sides of width 2.5m and 5m. Assume the length of the trough is 15m. How much work is required to pump the water out of the trough (to the level of the top of the trough) when it is full? Use 1000 kg/m^3 for the density of water and 9.8 m/s^2 for the acceleration due to gravity.
W = Integrand p(<roe)gA(y)D(y)