In a uniformly accelerated motion if its initial velocity is u and its final velocity is v displacement is
S= 1/2 (u+v)t
That's mean speed theorem for such kinds of motions
On the left you have #DaVinci's drawings in #CodexArundel
and on the right the geometric constructions of Oresme -above- and Galileo -below- that prove the theorem of mean speed of #OxfordCalculators at #MertonCollege
Sorry Leonardo but #Galileo and #Newton hold

LoL What nonsense at NYTimes
#CodexArundel is a compilation of sheets written by #LeonardoDaVinci between 1480 and 1518
What u see in Leonardo's drawings is nothing more than #MertonCollege method created by #OxfordCalculators around 1350 to compute displacements from speeds in movements Characterized before by #AlbertOfSaxony or #NicoleOresme and referred to as "uniformiter difformis" by #DeSoto,an spaniard,which was how the uniformly accelerated movement was finally designated in #MiddleAges