Kinetic energy density on NerfEngrWiki

Today I nearly finished a page on kinetic energy density for NerfEngrWiki. KED is one of the more important concepts in the safety of Nerf guns (and that much was admitted by chiefthe, a former Hasbro engineer). I detail the most important topics about kinetic energy density, however, I do not make any suggestions about what critical KED value to design for. I do not think enough data is available to make that decision. However, I intend to limit the most powerful blasters I make to a KED of 20\tfrac{\text{mJ}}{\text{mm}^2}.

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