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NEET Sample Paper NEET Sample Test Paper-49

  • question_answer
    A very large number of balls are thrown vertically upwards in quick succession in such a way that the next ball is thrown when the previous one is at the maximum height. If the maximum height is 5 m, then the number of balls thrown per minute is- (\[g=10\,m\,{{s}^{-2}}\])

    A) 120                              

    B) 80    

    C) 60                                

    D) 40

    Correct Answer: C

    Solution :

    Time taken by each ball to reach the maximum height. \[t=\frac{u}{g}\,=\,\frac{\sqrt{2gh}}{g}\,\,=\,\,\sqrt{\frac{2h}{g}}\,\,=\,\sqrt{\frac{2\times 5}{10}}\,\,=\,\,1s\] \[\because \] One ball is thrown in every 1s \[\therefore \] Total no. of balls thrown per minute = 60


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