Physics question, help

As a cliff diver drops to the water from a height of 46m, his gravitational potential energy decrease by 25,000J
a) What is the diver's weight in newtons?

Potential Energy=(mass)(Force of gravity)(height)
Height=46m
Force of gravity=9.81
Energy=25,000
Just plug them in and solve for mass:
25,000=(mass)(9.81)(46)
mass=55.4
Mass is usually measured in Kilograms in physics, so just multiply the mass times the force of gravity to get Newtons:
(55.4)(9.81)=543.47 N
THe diver weighs 543.47 Newtons.

Gravitational potential= mass*gravity*height
Rearranged:
Mass=gravitation potential/(gravity*height)
Therefore :
Mass=25000/(9.8*46)
=55.46kg