Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1porum velocitates in E& K& eodem argumento ſemper reperi­
entur æquales in ſubſequentibus æqualibus diſtantiis. que E. D.
LIBER
PRIMUS.
DE MOTU
CORPORUM
Sed & eodem argumento corpora æquivelocia & æqualiter a cen­
tro diſtantia, in aſcenſu ad æquales diſtantias æqualiter retarda­
buntur. Q.E.D.
Corol.1. Hinc ſi corpus vel funipendulum oſcilletur, vel im­
pedimento quovis politiſſimo & perfecte lubrico cogatur in li­
nea curva moveri, & corpus aliud recta aſcendat vel deſcendat,
ſintque velocitates eorum in eadem quacunque altitudine æquales:
erunt velocitates eorum in aliis quibuſcunque æqualibus altitudi­
nibus æquales.
NamQ.E.I.pedimento vaſis abſolute lubrici idem
præſtatur quod vi tranſverſa NT.Corpus eo non retardatur,
non acceleratur, ſed tantum cogitur de curſu rectilineo diſcedere.
90[Figure 90]
Corol.2. Hinc etiam ſi quantitas P ſit maxima a centro diſtan­
tia, ad quam corpus vel oſcillans vel in Trajectoria quacunque re­
volvens, deque quovis Trajectoriæ puncto, ea quam ibi habet
velocitate ſurſum projectum aſcendere poſſit; ſitque quantitas A
diſtantia corporis a centro in alio quovis Orbitæ puncto, & vis
centripeta ſemper ſit ut ipſius A dignitas quælibet An-1, cujus
Index n-1 eſt numerus quilibet nunitate diminutus; velocitas
corporis in omni altitudine A erit ut √Pn-An, atque adeo da­
tur.
Namque velocitas recta aſcendentis ac deſcendentis (per Prop.
XXXIX) eſt in hac ipſa ratione.

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