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  3. RAJASTHAN ­ PET

RAJASTHAN ­ PET Rajasthan PET Solved Paper-2005

  • question_answer
     \[n\] bullets of each of mass m hits the surface with velocity \[u\]. The force feet by surface will be

    A)  \[mnu\]

    B)  \[2\text{ }mnu\]

    C)  \[4\text{ }mnu\]  

    D)  \[zero\]

    Correct Answer: B

    Solution :

     The force felts by surface \[=\frac{Change\text{ }in\text{ }momentum}{time}\] \[=\frac{n[mu-(-mu)]}{1}\] \[=2\,mnu\]


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