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This question already has an answer here:

Looking at this Ariane 5 launch, I notice that:

  • the speed continously increase (as I expected)
  • the altitude first increase as I expected, then decrease (I was not expecting that) and then increase again.

When looking at the graph on the right upper corner, it looks like a totally calculated maneuvre. The slight altitude decrease is obvious around 30 minutes in the linked video.

Why do the trajectory of this rocket include a temporary loss of altitude for several minutes before increasing again the altitude?

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marked as duplicate by Hobbes, Russell Borogove, uhoh, ForgeMonkey, kim holder Apr 8 '17 at 16:52

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