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    Question

    A boy standing on a hill hears the echo of a shot from a

    nearby cliff located 2.5 km away, after 28 seconds. Determine the approximate speed at which sound travelled.
    A 55 m/s Correct Answer Incorrect Answer
    B 89 m/s Correct Answer Incorrect Answer
    C 63 m/s Correct Answer Incorrect Answer
    D 90 m/s Correct Answer Incorrect Answer

    Solution

    ATQ,

    Speed of sound

    = (2.5 × 1000) / 28

    = 2500 / 28

    ≈ 89.29 m/s or 89 approximately

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