Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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ris, decreſcet recta
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DC
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in ratione Geometrica ad modum veloci
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tatis, & partes rectæ
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AC
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æqualibus temporibus deſcriptæ decre
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ſcent in eadem ratione. </
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LIBER
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SECUNDUS.</
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PROPOSITIO III. PROBLEMA I.
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Corporis, cui dum in Medio ſimilari recta aſcendit vel deſcendit,
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reſiſtitur in ratione velocitatis, quodque ab uniformi gravitate
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urgetur, definire motum.
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<
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>Corpore aſcendente, ex
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ponatur gravitas per datum
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quodvis rectangulum
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BC,
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&
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reſiſtentia Medii initio aſ
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cenſus per rectangulum
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BD
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ſumptum ad contrarias par
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tes. </
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>Aſymptotis rectangulis
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AC, CH,
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per punctum
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B
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de
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ſcribatur Hyperbola ſecans per
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pendicula
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DE, de
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in
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G, g;
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&
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corpus aſcendendo, tempore
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DGgd,
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deſcribet ſpatium
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EGge,
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tem
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pore
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DGBA
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ſpatium aſcenſus totius
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EGB
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; tempore
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AB
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2
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G
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2
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D
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ſpatium deſcenſus
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BF
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2
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G,
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atque tempore 2
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D
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2
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G
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2
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g
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2
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d
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ſpatium
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deſcenſus 2
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GF
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2
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e
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2
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g
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: & velocitates corporis (reſiſtentiæ Medii
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proportionales) in horum temporum periodis erunt
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ABED,
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ABed,
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nulla,
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ABF
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2
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D, AB
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2
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e
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2
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d
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reſpective; atque maxima
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velocitas, quam corpus deſcendendo poteſt acquirere, erit
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BC.
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gulum
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AH
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in rectangula
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innumera
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Ak, Kl, Lm, Mn,
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&c. </
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>quæ ſint ut incrementa
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velocitatum æqualibus tot
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idem temporibus facta; & e
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runt nihil,
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Ak, Al, Am, An,
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&c. </
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<
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>ut velocitates totæ, at
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que adeo (per Hypotheſin)
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ut reſiſtentiæ Medii princi
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pio ſingulorum temporum
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æqualium. </
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<
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AC
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ad
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AK
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vel
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ABHC
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ad
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ABkK,
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ut vis gra
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vitatis ad reſiſtentiam in principio temporis ſecundi, deque vi gravi-</
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