'The potential energy of the Particle.
Examples
>>> from sympy.physics.mechanics import Particle, Point
>>> from sympy import symbols
>>> m, g, h = symbols(\'m g h\')
>>> O = Point(\'O\')
>>> P = Particle(\'P\', O, m)
>>> P.potential_energy = m * g * h
>>> P.potential_energy
g*h*m'

@property
def potential_energy(self):

    return self._pe
