Discorsi Propositions
2/23-pr-09-schol3
Discorsi Proposition
2/23-pr-09-schol3

Amplius, existente gradu celeritatis per naturalem descensum a mobili acquisito, suapte natura indelebili atque aeterno, considerandum occurrit, quod si post descensum per planum declive fiat reflexio per aliud planum acclive, iam in isto occurrit causa retardationis: in tali enim plano idem mobile naturaliter descendit; quare mixtio quaedam contrariarum affectionum exurgit, nempe gradus illius celeritatis acquisitae in praecedenti descensu, qui per se uniformiter mobile in {30} infinitum abduceret, et naturalis propensionis ad motum deorsum iuxta illam eandem proportionem accelerationis iuxta quam semper movetur.Further, although any velocity which a body may have acquired through natural fall is permanently maintained so far as its own nature [suapte natura] is concerned, yet it must be remembered that if, after descent along a plane inclined downwards, the body is deflected to a plane inclined upward, there is already existing in this latter plane a cause of retardation; for in any such plane this same body is subject to a natural acceleration downwards. Accordingly we have here the superposition of two different states, namely, the velocity acquired during the preceding fall which if acting alone would carry the body at a uniform rate to infinity, and the velocity which results from a natural acceleration downwards common to all bodies.

Discorsi Propositions
2/23-pr-09-schol3
Discorsi Proposition
2/23-pr-09-schol3