Borelli, Giovanni Alfonso, De motionibus naturalibus a gravitate pendentibus, 1670

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1
De vi per­
cuſs.
cap. 5.
axio. 1. eiuſ­
que corolla­
rio.
Cap. 10. de
æquitempo­
ranea natu­
rali veloci­
tate grauium.
PROP. CCVIII.
Quælibet corpora homogenea inter ſe inæqualia ex ſui natu­
ra æquè velocia ſunt.
SInt duo quælibet corpora homogenea A, & B,
quorum A maius ſit quàm B; dico æquali veloci­
tate deſcendere, ablatis tamen
152[Figure 152]
omnibus impedimentis.
Si
enim hoc verum non eſt ma­
ius corpus A deſcendet cele­
riùs, vel tardiùs, quàm B; &
primò ſi fieri poteſt, maius
corpus A celeriori motu fe­
ratur, ſcilicèt eodem tempo­
re T, percurrat A maius ſpa­
tium C, verùm B pertranſeat
ſpatium minus E; ſumatur aliud corpus G homoge­
neum ipſi A, vel B, quod maius ſit ipſo A, ſed com­
menſurabilem proportionem habeat ipſi B, ſcilicèt
eius partes ſit.
erunt igitur (ex præced. prop.) cor­
pora G, & B æquè velocia, ſcilicèt eodem tempore
T corpus G percurret idipſum ſpatium E, quod per­
tranſierat corpus B; eſt verò G maius, quàm A, & ei
homogeneum, ergo maius corpus G tardiori motu
deſcendit, quàm corpus minus A, ſcilicèt eodem ten­
pore
T corpus maius G pertranſit minus ſpatium E,
atque A percurrit ſpatium maius G, quod eſt contra
hypotheſim, debebat enim maius corpus celeriori

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