conservation of momentum
The law of cat-servation of momentum.
Einstein was that meticulous when he derived the Lorentz-FitzGerald Transformations (LFT) from first principles for his Special Theory of Relativity (STR). Therefore, if you think about it, does this mean that momentum is a particle's elementary property that appears to be related to mass?
WHAT'S HAPPENING
WHAT'S HAPPENING