Time-dependence of the vertical velocity ẋ of the load obtained from the numerical solutions of the equation (16) for different numbers N₁ of horizontaland N₂ of vertical folds. Green lines show N₁ varying from2 to 20 with fixed N₂ = 10, blue lines – vice versa. Naturally, when increasing the number of folds, the height of the ball also increases. The curves are cut off at the point of maximum, that is in the moment of separation from the construction.