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You need to move at a speed of 4km/s.
Another question. You always hear and see jets break the sound barrier but when they put their "boost" is there a point where they can't break the speed barrier traveling upwards? Or can you only break sound barrier within the confines of the earth.
Speed of sound changes with altitude
https://en.wikipedia.org/wiki/Speed_of_sound
Right idea, wrong number. Satellites in low Earth orbit are typically moving at about 7-8 km/s, depending on the exact altitude. The speed required to get from the surface to deep space (i.e., the "escape velocity") is 11.2 km/s.