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# Title: Lectures De Potentia Restitutiva, Or Of Spring (shelfmarks Leibn. Marg. 105, Stück 1; Leibn. Marg. 105)
# Folio 22, page id 859264114:0028
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Impedimene ofche medium doch hinder the exactnets
OF it. IF it b0 delivered rich creble, quadruple.
quintuple, sexcuple, exc. the Arst Velociey it Maii
touch the Aoor at almost treble, quadruple, quintu-
Dle, sextuple, exc. the Airst distance. IMall nocnecd
tothem chereason rhy ic is mored in a l’arabola, it
havins been Cutticiently demonstrated lons Cince by
manv others.
IE the body be delirered by the Spring at the AOOF,
buc Bocby lome Angle uxmards, knomins wichurtrat
Velocier ehe Came is mored wrhen delivered, and rith
wrhrat Inclinationto the Perpendicular the lame is di-
rected, and the erue Velocirr ot a Falling body, vou
may calisy knom thelenoth oF thc Factus or Moc, and
the cime it wiltipend in pastins chac lenoth.
Thisis found by comparine the time oF its alcent
ith chetime ot the descent ot hearrbodies. TheaF
cent oF ans body is casils bnomn by comparins IEs
Velocier wich the angle oF inclination.
Lec abthen in the Atth Pigure reprelent 16 FoOt, Or
the space descended by a heary body in a second
minute oF time. IF abody besotFrom b, in the Linc
bfrich a Velocies as much Critter than thac equal
motion oF 16Foot in a second, asthis Lincb fis longer
than ab thebod MaII Fallac e; For in the lame (pacc
OF time thac the oblique equal motion mould make
it alcend From b d to a c, willehe accelerated direct
motion domnmardmore ic From ac to b d, and chere-
Fore at the end ot the space ot one second, When the
motions do equal and balance cach other, the body
must be in the lame Hlorizontal Line in irtich it masat
Arst, buc remored alunder by the space b e, and FOr
the poines it passeth chrough in all the intermediate
Spaces this method will determine it.
Let thc Parallelogram abpq then represent
the wrhole Velocitr oF the alcent ot a body by
an equal motion of 16 F00c in a second, and
ihe Friansle Par reprelent che rhole Velocity