1. The problem statement, all variables and given/known data 2. Relevant equations 3. The attempt at a solution What I attempted to do is .80(1/2)mv2 = Ee Where v is the velocity of the falling water, m is the mass of the falling water, and Ee is the electrical power generated by the electric plant. So then I solved for m since you are given the Ee and the velocity and I got 3.86 x 10e5 kg/s.