The Brachistochrone Problem: The Path of Quickest Descent .

Friends! I made an experiment that at first glance contradicts the law of conservation of energy. We are talking about the line of steepest descent, which is called brachistochrone. The balls are at the same height, the friction and air resistance are negligible, and the balls do not simultaneously descend to the lower level. Although they eventually acquire the same speed of movement, they do not return in the same time, which at first glance may be a contradictory experiment. Actually there is no contradi