code: def new_inertial(name=None, pos=(0, 0, 0), mass=None, **kwargs):
      
      if mass is not None:
          kwargs["mass"] = str(mass)
      kwargs["pos"] = array_to_string(pos)
      element = ET.Element("inertial", attrib=kwargs)
      return element
docs: Creates a inertial element with attributes specified by @**kwargs.
  
      Args:
          mass: The mass of inertial