Potential energy can be calculated using the following rule: potential energy = mgh where: m is the mass = 85 kg g is the acceleration due to gravity = 9.8 m/sec^2 h is the height = 4 km = 4000 meters
Substitute in the above equation to get the potential energy as follows: Potential energy = 85*9.8*4000 = 3332000 joules
