Calculate the potential energy of a 50 kg diver on a board 5 meters above the water.

This is for connections grade 8 unit 4 sample work and I don’t understand help please:(

How much work would you put in to lift the diver 5 meters?

work = increase in potential energy = Force * distance in direction of force = m g h
force up = m g = 50 kg * 9.81 m/s^2
distance up = 5
so work in = 50 * 9.81 * 5 Joules = potential energy gained = 2452 Joules