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9th Class Science Time and Motion Question Bank Motion

  • question_answer
    An aeroplane, when it is vertically above the point A on the ground, drops a bomb which hits target B on the ground. If the plane is moving at a height of 1.96 km from the ground with a speed of 300 m/sec, then distance between A and B is (neglecting air resistance)

    A)  3 km                                    

    B)  6 km  

    C)  3 m/s                   

    D)         4 m/s

    Correct Answer: B

    Solution :

     Let \[x\] be the distance between \[A\] and \[B\], then             \[x=u\sqrt{\frac{2h}{g}}\] Here,     \[h=1.96\,\,km=1960\,\,m\] \[\therefore \]      \[x=300\sqrt{\frac{2\times 1960}{9.8}}\]             \[=6000\,\,m=6\,\,km\]


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