preparation for youtube
from EOM
x = ux.t
from data analysis
x = 1.772t

from EOM
y = uy.t + 0.5.a.t^2
from data analysis
y = 2.436.t -5.202.t^2
imply
y = 2.436.t - 0.5*10.404.t^2

[b][color=blue]there appears to be an error of |(9.81-10.404)/9.81| = 0.06
i guess it is due to the ruler, perhaps i didn't choose 1 meter correctly. Reply if you know why.thx![/color][/b]