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The equation used in the movie is S=1/2at2.S is the altitude, a is 32 ft/s2(9.8m/s2)(In reality it is negative, but becasue it is squared, it becomes positive) and t is time it takes the rocket to get from its highest point to the ground. This is derived from the y-component no Vf(final velocity) equation as follows:

(delta)X or S or height = Viyt + 1/2at2

at the crest, Viy=0, S = Viyt + 1/2at2

This gives you: S = 1/2at2

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