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  1. The speed of rotation of the earth is ________

    2. A.

     25 km/sec.
    B.

     31 km/sec.
    C.

     39.5 km/sec.
    D.

     9.72 km/sec.

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    Answer : Option D

    Explanation :

    The speed of rotation of the earth is 9.72 km/sec.

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