Which type of wave on the electromagnetic spectrum has the longest wavelength

Potential energy is

Explanation:

The potential energy depends on the mass, the acceleration of gravity g and the height at which the object or person is.

Potential energy  

In this case we would need to know the exact mass of the hiker in order to calculate the potential energy.

But we know the values of g and h

So, the potential energy

m is the mass of the hiker, wich is not in the description of the problem.