9. The air temperature is 20C. You are swimming underwater when you hear a boat noise. Then, 3.5 s later, you hear a crash. If
9. The air temperature is 20C. You are swimming underwater when you hear a boat noise. Then, 3.5 s later, you hear a crash. If the speed of sound in water is 1450 m/s, how long after the crash does your friend on the dock beside you hear the crash
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