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    5. how fest is the speed of sound
    how fest is the speed of sound

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    0  Views: 592 Answers: 1 Posted: 13 years ago
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      In dry air at sea level with a temperature of 21 °C (70 °F) the speed of sound is 344 m/s (1230 km/h, or 770 mph, or 1130 ft/s).

      13 years ago. Rating: 1
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