If a body were to be pushed or received an impulse from a force applied evenly by a spirit (in effect, no other type of force could be as even), and if it were to be driven in a void, it would always take three times more time to travel from the beginning of its movement up to the midpoint of the space to be traveled than from the midpoint of the space to its end, and so on. For because no void of this type can be created and because, whatever the existing space, it will always resist in some way: as such, the resistance always increases in geometric proportion to the speed of the movement, such that one ultimately arrives at the point where the speed is not perceptibly augmented and it becomes possible to determine a certain other final speed, to which it will never be equal
