This document discusses the unification of concepts in Newtonian mechanics. It describes how Galileo first unified rest and uniform motion. Newton then unified Galileo's work with his laws of motion (F=ma and F=mg). Einstein further unified these concepts by incorporating electromagnetism into special relativity and equivalence between gravity and acceleration. The document proposes unifying acceleration and uniform motion by postulating that observers have multiple existences based on Schrodinger's cat thought experiment. This multiple existence allows inertial and non-inertial frames to be considered equivalent from the perspective of different existences of the observer.