Say you had a crystal lattice box on a micro scale. You can push it with a bigger piston to accelerate it. Say it's lying on a friction-less surface (or this happens in minimal gravity and vacuum). My question is, would the possible kinetic energy that you can impart on this cube be quantized? Or is this a large scale free particle question? I.e. are there are kinetic energies as a whole that this box literally cannot assume?