Free fall in the vacuum [La chute libre dans le vide].

In the vacuum, the vertical distance (Z) traveled during the free fall of a body is proportionnal to the square of its duration (T).

                         1     2
                    Z = ---.G.T

For example if G=2:
                    T=0 ==> Z=0
                    T=1 ==> Z=1
                    T=2 ==> Z=4
                    T=3 ==> Z=9

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