x= α t^2 - βt^3 = 1,5 t^2 -0,05 t^3 ; v = 1,5 t -0,05 t^2
t=0 a t = 2 ; vo = 0 ; v2 = 3-0,05. 4 = 2,987 vmedia = 2,987 / 2 = 1,493
t=0 a t = 4 ; vo = 0 v4 = 6 - 0,05 . 16 = 5,200 v media = 5,200 / 2 = 2,600
t = 2 a t = 4 vo = 2,987 ; v4 = 5,200 ; v media = (2,987 + 5,200)/2 = 4,093