We also assume that every explosion is isotropic in
space; i.e., the N particles are evenly distributed over the angular interval (0, 2π); furthermore,
we take the kth particle departing from point E, where the explosion occurs with an additional
velocity Vk1, whose modulus V1 does not depend on k. Under these assumptions, in the
following section, we write the parametric equations for each kth particle flying off the shell
after explosion and give some simple graphical constructions of their trajectories. In the third
section, generalization in three dimensions is given and a related problem concerning the
geometrical figures the tiny particles falling on the ground make after explosion are studied.
Conclusions are drawn in the last section