On obtient deux solutions, une solu

On obtient deux solutions, une solution positive et une solution négative. La solution négative est physiquement rejetée car, après l’instant de lancement choisi comme origine des temps, t ne peut être que positif. Donc tenvol = 3.17 s.

Results (English) 1:

We obtain two solutions, a positive solution and a negative solution. The negative solution is physically rejected because, after the launch instant chosen as the origin of the times, t can only be positive. So tenvol = 3.17 s.

Results (English) 2:

Obtain two solutions, positive and negative. The negative solution is physically rejected because after selecting the emission time as the time origin, t can only be positive. Therefore, tenvol=3.17s.

Results (English) 3:

There are two solutions, a positive solution and a negative solution. The negative solution is physically rejected, because t can only be a positive number after the starting time is selected as the time source. So tenvol = 3.17 s.