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Notes for The Flight of an Arrow
1. This law states that the force which retards the fall of small spheres in air is proportional to the velocity.
2. That this assumption is erroneous is shown by the fact that his formula indicates that an arrow shot vertically upward will rile higher in air than it would in vacuum. When one determines the path of the arrow at the higher angles of elevation, using the English equations for positions, the computed path rises above the trajectory in vacuum for the same elevation. Both results are obviously incorrect.