Reply to post:

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

Anonymous Coward
Boffin

You are counting only radial component of velocity: you must also take into account tangential. We know by reading Wikipedia that ballistic missile can reach targets within about 10,000km in about 30m or 1,800s, giving average speed over the ground of around 5,555 m/s. Actual average tangential component of velocity will be higher as missile takes much longer path of course. This gives average speed over ground of ballistic missile of approx mach 15.

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