Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1
Corol.4. Spatium vero a corpore deſcriptum differentia eſt duo­
rum ſpatiorum, quorum alterum eſt ut tempus ſumptum ab initio
deſcenſus, & alterum ut velocitas, quæ etiam ipſo deſcenſus initio
æquantur inter ſe.
LIBER
SECUNDUS.
PROPOSITIO IV. PROBLEMA II.
Poſito quod vis gravitatis in Medio aliquo ſimilari uniformis ſit,
ac tendat perpendiculariter ad planum Horizontis; definire mo­
tum Projectilis in eodem, reſiſtentiam velocitati proportionalem
patientis.
Eloco quovis Degrediatur Pro­
145[Figure 145]
jectile ſecundum lineam quam­
vis rectam DP,& per longitu­
dinem DPexponatur ejuſdem
velocitas ſub initio motus.
A
puncto Pad lineam Horizonta­
lem DCdemittatur perpendi­
culum PC,& ſecetur DCin A
ut ſit DAad ACut reſiſtentia
Medii, ex motu in altitudinem
ſub initio orta, ad vim gravi­
tatis; vel (quod perinde eſt) ut
ſit rectangulum ſub DA& DP
ad rectangulum ſub AC& CP
ut reſiſtentia tota ſub initio mo­
tus ad vim gravitatis.
Aſymptotis
DC, CP,deſcribatur Hyperbo­
la quævis GTBSſecans perpen­
dicula DG, ABin G& B; &
compleatur parallelogrammum
DGKC,cujus latus GKſecet
ABin queCapiatur linea N in
ratione ad QBqua DCſit ad
CP; & ad rectæ DCpun­
ctum quodvis Rerecto perpen­
diculo RT,quod Hyperbolæ
in T,& rectis EH, GK, DP
in I, t& Voccurrat; in eo cape Vræqualem (tGT/N), vel quod per-

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