I understand why the speed of light is a constant in all reference frames, and the reason behind why the mass of an object increases as it approaches the speed of light.( Since the added energy has to go somewhere it turns out to be just mass.) Now, due to this and the fact that we require infinite energy to reach the speed of light, we will never be able to do that. But, people also seem to be talking about information and forces(like the electrostatic force) not being able to travel faster than the speed of light. I dont understand this statement.It is not mass anyway, then why is it restricted by the speed of light? (I AM NOT TALKING ABOUT QUANTUM ENTANGLEMENT, SINCE WE DON'T KNOW MUCH ABOUT IT;ALL CLASSICAL)