Heytesbury ati awọn miran mathematically pinnu awọn ijinna bo nipasẹ a ara undergoing uniformly accelerated motion (loni solved nipa integration), stating that "a moving body uniformly acquiring or losing that increment [of speed] will traverse in some given time a [distance] completely equal to that which it would traverse if it were moving continuously through the same time with the mean degree [of speed]". Oresme ni Paris ati awọn Italian Giovanni Casali ni ominira ti pese awọn nọmba apapọ ti awọn diodes ti o ni idaniloju asopọ aworan ti yi, ti o yoo ṣe apejuwe [ara kan] ti o ba... ti o ba gbe ni deede ni iwọn kanna ti iyara pẹlu eyiti o ti gbe ni akoko yẹn. Heytesbury ati awọn miiran mathematically pinnu ijinna ti a bo nipasẹ ara ti o ni igbesẹ iṣọkan ti iyara ti o ni deede ti o yara (laisi idapọpọ), ti o sọ pe "ara ti o nlọ ni deede ti o gba tabi padanu pe ilosoke [ti iyara] yoo kọja ni diẹ ninu akoko ti a fun ni [iduro] patapata laisi eyiti o yoo kọja ti o ba
ìyàsọ̀tọ̀ àti èròǹgbà àwọn ààlà