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NEET Sample Paper NEET Sample Test Paper-46

  • question_answer
    A ball is dropped from the 9th storey of a multi-storeyed building reaches the ground in 3 second. In the first second of its free fall, it passes through n storeys, where n is equal to - (Take\[g=10\text{ }m\text{ }{{s}^{-}}^{2}\])

    A) 1

    B)                    2

    C)                    3

    D)                    4

    Correct Answer: A

    Solution :

    Let height of each storey is y meter. \[\therefore \,\,\,H\,\,=\,\,ut\,\,+\,\,\frac{1}{2}g{{t}^{2}}\] \[\therefore \,\,\,9y\,\,=\,\,0+\frac{1}{2}\times 10\times {{3}^{2}}\,\,\Rightarrow \,\,y\,\,=\,\,5\,m\] now for the first sec \[ny=ut\,\,+\,\frac{1}{2}g{{t}^{2}}\] \[ny=0\,\,+\,\,\frac{1}{2}\,\,\times \,\,10\,x\,{{1}^{2}}\,\,\Rightarrow \,\,n=1\]


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