2/23-pr-09-schol2
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| Attendere insuper licet, quod velocitatis gradus, quicunque in mobili reperiatur, est in illo suapte natura indelebiliter impressus, dum externae causae accelerationis aut retardationis tollantur, quod in solo horizontali {20} plano contingit; | Furthermore we may remark that any velocity once imparted to a moving body will be rigidly maintained as long as the external causes of acceleration or retardation are removed, a condition which is found only on horizontal planes; |
| nam in planis declivibus adest iam causa accelerationis maioris, in acclivibus vero retardationis: ex quo pariter sequitur, motum in horizontali esse quoque aeternum; si enim est aequabilis, non debilitatur aut remittitur, et multo minus tollitur. | for in the case of planes which slope downwards there is already present a cause of acceleration, while on planes sloping upward there is retardation; from this it follows that motion along a horizontal plane is perpetual; for, if the velocity be uniform, it cannot be diminished or slackened, much less destroyed. |
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