Gravitational potential energy (GPE) is energy within an object with respect to its height. The equation of gpe is:
GPE = mgh
where:
m = mass of object
g = gravitational constant, 9.81 m/s^2
h = height
For a given gpe of 20 J, the height can be calculated as follows:
*Remember to be consistent with units. Since Joule is derived from SI units, make sure to use SI units for the other variables
GPE = 20 J = 1 (9.81) (h)
h = 2.04 meters
