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]