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9th Class Science Force and laws of motion Question Bank Force and Laws of Motion

  • question_answer
     A bullet of mass a and velocity b is fired into a large block of wood of mass c, the final velocity of the system is

    A)  \[\frac{b}{c+b}\]            

    B)  \[\frac{a+b}{c}a\]

    C)  \[\frac{a}{a+c}a\]             

    D)         \[\frac{a+c}{a}b\]

    Correct Answer: C

    Solution :

     Initial momentum\[=ab\]If \[v\] is final velocity of the combined mass\[(a+b)\],then final momentum\[=(a+b)v\] Equating, we get\[v=\frac{ab}{a+c}\]


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