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A stone is dropped into a well of 80m deep. The sound of splash is heard 4.20 sec after the stone is dropped. Find the velocity of sound in air.

  • science -

    time to fall is from

    80 = 4.9t^2
    t = 4.04 s

    time for sound to return: 4.20-4.04 = 0.16 s

    80m/0.16s = 500m/s

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