Prop. III. Prob. I.
Corporis, cui dum in Medio similari recta ascendit vel descendit, re∣sistitur in ratione velocitatis, quod{que} ab uniformi gravitate urgetur, definire motum.
Corpore ascendente, ex∣ponatur
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Corporis, cui dum in Medio similari recta ascendit vel descendit, re∣sistitur in ratione velocitatis, quod{que} ab uniformi gravitate urgetur, definire motum.
Corpore ascendente, ex∣ponatur
ascensus totius EGB, tempore AB 2G 2D spatium descen∣sus BF 2G, at{que} tempore 2D 2G 2g 2d spatium descensus 2 GF 2e 2g: & velocitates corporis (resistentiae Medii propor∣tionales) in horum temporum periodis erunt ABED, ABed, nulla, ABF 2D, AB 2e 2d respective; at{que} maxima velocitas, quam corpus descendendo potest acquirere, erit BC.
Resolvatur enim rectangulum AH in rectangula innumera Ak, Kl, Lm, Mn, &c. quae sint ut incrementa velocitatum aequalibus totidem temporibus facta; & erunt nihil, Ak, Al, Am, An, &c. ut velocitates totae, at{que} adeo (per Hypothesin) ut resistentia Medii in
tertii, quarti, &c. Proinde cum areae aequales BAKq, qKLr, rLMs, sMNt, &c. sint viribus grauitatis analogae, erunt areae Bkq, qklr, rlms, smnt, &c. resistentiis in mediis singulorum temporum, hoc est, (per
Corol. 1. Igitur velocitas maxima, quam corpus cadendo potest acquirere, est ad velocitatem dato quovis tempore acquisitam, ut vis data gravitatis qua perpetuo urgetur, ad excessum vis hujus supra vim qua in fine temporis illius resistitur.
Corol. 2. Tempore autem aucto in progressione Arithmetica, summa velocitatis illius maximae ac velocitatis in ascensu (at{que} etiam earundem differentia in descensu) decrescit in progressio∣ne Geometrica.
Corol. 3. Sed & differentiae spatiorum, quae in aequalibus tempo∣rum differentiis describuntur, decrescunt in eadem progressione Geometrica.
Corol. 4. Spatium vero a corpore descriptum differentia est duorum spatiorum, quorum alterum est ut tempus sumptum ab initio descensus, & alterum ut velocitas, quae etiam ipso descen∣sus initio aequantur inter se.