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7th Class Science Time and Motion Question Bank Motion and Time

  • question_answer
    In a 100 m race Revanth and Rohan ran at an average speed of \[8.4\,m\,{{s}^{-1}}\]and \[12.2\,m\,{{s}^{-1}}\]respectively. If 12 seconds is the time taken in school records for 100 metre race, then which of the following can be true?

    A)  Revanth broke the record.

    B)  Rohan broke the record.

    C)  Both Revanth and Rohan broke the record.

    D)  Neither Revanth nor Rohan broke the record.

    Correct Answer: C

    Solution :

    Time taken by Revanth to cover 100m race \[=\frac{Dis\tan ce}{Speed}=\frac{100}{8.4}=11.9\,s\] Time taken by Rohan to cover \[100m\,race=\frac{100}{12.2}\,=8.2\,s\] Since, the school record for 100 metre race is 12 s and time taken by Revanth and Rohan is 11.9 s and 8.2 s respectively, it means, both break the record.           


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