I have been told over and over again that the kinetic energy of hand propelled projectiles of varying masses at different speeds is far greater than the mouth released projectiles of differing decibel levels and durations. While I cannot cite the exact research organization or the paper in which this was published nor can I say with any certainty that it was properly peer reviewed; I can, without any hesitation state, based upon the sheer number of repetitions of this saying in school yards across the world, there is raw data and therefore a high potential that the hypothesis has been or will be proved or disproved. Wow, now I feel all sciencie. Look at me talking kinetic energy and peer reviewed papers. Don’t worry, I’ve exhausted all my science so we can move on.