"Works" in what sense? Nobody is stopping you from plugging negative values everywhere, but the laws were formulated with sctrictly >=0 mass in mind. What woul

"Works" in what sense? Nobody is stopping you from plugging negative values everywhere, but the laws were formulated with sctrictly >=0 mass in mind. What would need to happen for you to claim that negative mass "doesn't work"? Some infinities somewhere? A division by zero in some place?