Power = Work Done / Time
Work Done = Force * Displacement
PE = mass * gravity * height
The Attempt at a Solution
I got the first part (i) right, so the mass of the sea water is 1.32 x 10^12 kg.
Part (ii) is the bit I am stuck on. My thoughts were that it must fall 10m, so the max loss in PE is (1.32 x 10^12)(9.81)(10), but the mark scheme says the height is 5m, so that it is (1.32 x 10^12)(9.81)(5). Why do we take the height to be 5m here when it falls through 10m?