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North Korea worried a lot of countries when it said it test-fired a hypersonic missile in Japan's direction

Pascal Monett Silver badge

Wikipedia confirms that a hypersonic missile goes at Mach 5.

Since you mention terminal velocity, I'm guessing that the ballistic missile attains that speed at re-entry. By definition, a ballistic trajectory has a high point. Before that point, it's going up, after that point, it's going down. Only when going down can it increase its speed, and it can only increase its speed while the atmosphere is not thick enough to slow it down.

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