If a particle is launched with kinetic energy as it gets further from the mass (eg a planet) the kinetic energy decreases. However Potential Energy GMm/r also decreases the further you get from the mass. Where does all this energy go? Granted, the calculation U + K = 0 does give an answer that I have seen all over the place for escape velocity but I always thought energy is conserved and we have initial kinetic and potential energy but no final energy. I was wondering if energy is a vector quantity and there is no resultant energy.