2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/146733The paper present a model for the drag force between a resistive medium and a solid body using the hypothesis that the drag force is created by the adhesion of some particles of the resistive medium on the solid body's surface. The study focus on the mass evolution of the solid body.4 pagesMathematical Physics70F40; 70P05text