Take into account that the gravitational potential energy is given by:
U = m*g*h
where,
m: mass of the person = 97.3kg
g: gravitational acceleration constant = 9.8m/s^2
h: height of the top of the building = 51.9m
Replace the previous values of the parameters into the formula for U and simplify:
U = (97.3kg)(9.8m/s^2)(51.9m)
U = 49488.726 J
Hence, the potential energy is approximately 49488.726J
