'Returns the right hand side of the kinematical equations in explicit
form, q\' = G'

@property
def kin_explicit_rhs(self):

    if (self._kin_explicit_rhs is None):
        raise AttributeError('kin_explicit_rhs    is    not    specified    for    equations    of    motion    form    [1]    or    [2].')
    else:
        return self._kin_explicit_rhs
