Two Models for Air Drag (for an object moving vertically): Quadratic in v:
a(x,v,t) = -g (1 + v abs(v)/vt2)
Linear in v:
a(x,v,t) = -g (1 + v/vt )
Pat Cooney pjcooney@marauder.millersville.edu --last modified 1997.11.01