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  3. 9th Class
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  5. Time and Motion

9th Class Science Time and Motion Question Bank Motion

  • question_answer
    An electron starting from rest has a velocity that increases linearly with time, i.e. \[u=kt\], where k = (2 m/s)/s. The distance covered in the first three second will be

    A)  36m                                     

    B)  27m

    C)  18 m                    

    D)         9 m  

    Correct Answer: D

    Solution :

     Given \[v=kt\]and          \[k=(2m/\sec )/\sec \]. \[\therefore \]      \[v=2t\] If \[t=3\], then \[y=6\] \[\therefore \]\[s=\]Area of \[\Delta OAB\]\[=\frac{1}{2}\times 6\times 3=9\,\,m\].


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