I took out the main part of the footnote: it should be obvious that in a physical equation only compatible physical units can be used, and that otherwise conversion factors have to be introduced. But there is no problem, if we have c in feet/h, m in pounds, and E in pound*feet²/h² | I took out the main part of the footnote: it should be obvious that in a physical equation only compatible physical units can be used, and that otherwise conversion factors have to be introduced. But there is no problem, if we have c in feet/h, m in pounds, and E in pound*feet²/h² |