Given,
The mass of the diver, m=70.0 kg
The height of the platform, h=3.0 m
The potential energy of a body is the product of the height at which the body is situated and the weight of the body.
That is the potential energy of the diver is given by,
Where g is the acceleration due to gravity.
On substituting the known values in the above equation,
Therefore the potential energy of the diver is 2058 J