I used the formula P = 1/2 mv^2/t. Then multiplied by s on both sides to get P.s = 1/2 x mv^2/t x s
==> P.s = 1/2mv^3 and then expressed v = root(2gh) and equated.
BUT I Got h = (1/2g) x (2sP/m)^2/3 but the answer is h = (1/2g) x (4sP/m)^2/3
Any idea where I am going wrong?