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9th Class Science Force and laws of motion Question Bank Force And Laws Of Motion IIT JEE Objective Problems

  • question_answer
    The average force that is necessary to stop a hammer with a momentum of 25 Ns in 0.05 s, is about

    A)  500 N   

    B)  125 N

    C)  50 N                     

    D)  25 N

    Correct Answer: A

    Solution :

       Given, change in momentum \[(\Delta p)=25\] Ns \[\Delta t=0.5\text{ }sF=?\] we know, \[F=\frac{change\text{ }in\text{ }momentum}{change\text{ }in\text{ }time}=\frac{\Delta p}{\Delta t}\] \[=\frac{25}{0.05}=500\,N\]       


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