CONCEPT:
Potential energy is given by:
PE = m g h.
Here, PE is the Potential Energy, m is the mass, g is the acceleration due to gravity, and h is the height at which the object is placed
CALCULATION:
Given that:
Mass (m) = 10 Kg
Height (h) = 20 m
P.E. = 10 x 10 x 20
P.E.= 2000 J
P.E. = 2 kJ