This looks great! Is it possible to update the net force bar during the animation, to show how this force eventually will vanish due the the air resistance? Perhaps even the air resistance could be illustrated with an arrow object?  :)

vMax seem to be 8.0 km/h (rather than 72.5 km/h) for a 80 kg skier with Cd*Ap=0.84. Is there an error in the speed calculation?