curva balistica o parabola smorzata
cartesiana

y = h x / k + w ln(1-x/k)

prova a modificare slider

h = 1.7 (slider from -5 to 5, step 0.1)
k = -1.8 (slider from -5 to 5, step 0.1)
w = 5 (slider from -5 to 5, step 0.1)
f(x) = (h * x) / k + w * log(1 - x / k)