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BHU PMT BHU PMT (Mains) Solved Paper-2007

  • question_answer
    A body is dropped from height 8 m. After striking the surface it rises to 6 m, what is fractional loss in kinetic energy during impact? Assuming air resistance to be negligible.

    A)  2/5                                       

    B)  ¼

    C)  3/4                                       

    D)  1/5

    Correct Answer: B

    Solution :

                     Initial energy of the ball \[=mg\times 8\] Final energy of the ball \[=mg\times 6\] Loss in energy during impact \[=8\text{ }mg-6\text{ }mg=2\text{ }mg\] \[\therefore \]Fractional loss\[=\frac{2\,mg}{8\,mg}=\frac{1}{4}\]


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