'The potential energy of the RigidBody.
Examples
>>> from sympy.physics.mechanics import RigidBody, Point, outer, ReferenceFrame
>>> from sympy import symbols
>>> M, g, h = symbols(\'M g h\')
>>> b = ReferenceFrame(\'b\')
>>> P = Point(\'P\')
>>> I = outer (b.x, b.x)
>>> Inertia_tuple = (I, P)
>>> B = RigidBody(\'B\', P, b, M, Inertia_tuple)
>>> B.potential_energy = M * g * h
>>> B.potential_energy
M*g*h'

@property
def potential_energy(self):

    return self._pe
