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Which speed is at at the sound barrier?

Which speed is at at the sound barrier?-example-1
User Morotspaj
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The answer is 343 m/s.

User Rahul Dabas
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The answer is a, 343

In dry air at 20 °C (68 °F), the speed of sound is 343 metres per second (about 767 mph, 1234 km/h or 1,125 ft/s).

User JonRed
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