An 85-kg refrigerator is located on the 70th floor of a skyscraper (4km above the ground) what is the potential energy

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