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

  • question_answer
    Mohan takes 20 minutes to cover a distance of 3.2 kilometers due north on a bicycle, his velocity in kilometer/hour is

    A) 8.1                 

    B) 9.6

    C) 1.2                              

    D) 7.2

    Correct Answer: B

    Solution :

        The total distance moved \[s=3.2km\] (due north) The total time taken \[t=20\text{minutes}\]                                     \[=\frac{20}{60}hours=\frac{1}{3}hours\] The velocity of the bicycle             \[v=\frac{\text{Total distance covered}}{\text{Total time taken}}=\frac{s}{t}\]             \[v=\frac{3.2km}{(1/3)h}=9.6km/h\,\,\,\text{due north}\]


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