Marci of Kronland, Johannes Marcus, De proportione motus figurarum recti linearum et circuli quadratura ex motu, 1648

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1
Inſtabis ſi totus impulſus, VG trianguli ABC, ſecatur in duo qua­
drata DE at〈qué〉 EA: quia motus eſt æqualis impulſui; erit ut quadra­
tum DE ad quadratum EA, ita motus centri ad motum reflexum à
plagâ in DG. maior ita〈qué〉 DG quàm AE: nimirum in ratione duplica­
tà eius, quam habet AE ad DE: ac proinde angulus reflexionis minor
angulo GDH.
Reſpondeo cùm motus augeatur pro ratione impulſús; hu­
ius verò incrementa pro ratione illius morulæ, in quâ perfici­
tur plaga, habeant rationem quadrati; neceſse quoque motum
inter ſe conferri ut quadrata.
Quod confirmatur à poſterio­
ri.
Conſtat experientiâ, atque omnium aſſenſu pilam reflecti
ad angulos æquales: hoc autem nullâ ratione fieri poteſt, niſi
motus ad ſe referantur ut quadrata.
Aſſumatur enim figura
prop: 39: in quâ angulus incidentiæ CDA æquatur angulo
reflexionis IAB: dico impulſum, & qui hunc ſequitur motum
centri grauitatis reſiduum à plagâ, eandem rationem habere
ad motum inde reflexum, quam habet quadratum EF ad qua­
dratum FD, hoc eſt per prop: 12. illorum durationem eſſe

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