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

  • question_answer
    A car travels with a speed of \[50\,km\,{{h}^{-1}}\] in the 1st 30 minutes and \[100\,km\,{{h}^{-1}}\] in the next 30 minutes. What is the total distance covered by the car?

    A)  50 km                                  

    B)  75 km  

    C)         150 km                

    D)         200 km

    Correct Answer: B

    Solution :

    Speed of a car in 1st 30 minutes \[=\frac{30}{60}=(0.5\,h)=50\,km\,{{h}^{-1}}\] Distance travelled in the 1st 30 minutes = speed \[\times \] time = 50 \[\times \] 0.5 = 25 km Speed of a car in the next 30 minutes \[=100\text{ }km\,{{h}^{-1}}\] Distance travelled in the next 30 minutes \[=speed\times time=100\times \frac{1}{2}=50\,km\] Total distance covered = 50 + 25 = 75 km.


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