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Manipal Medical Manipal Medical Solved Paper-2005

  • question_answer
    A disc of mass 100 g is kept floating horizontally in air by firing bullets, each of mass 5 g with the same velocity at the same rate of 10 bullets per second. The bullets rebound with the same speed in opposite direction, the velocity of each bullet at the time of impact is:

    A)  196 cm/s     

    B)  9.8 cm/s

    C)  98 cm/s      

    D)  980 cm/s

    Correct Answer: D

    Solution :

     From law of conservation of momentum Total momentum of bullets = Momentum of disc \[2m\upsilon m=mg\] \[\upsilon \frac{mg}{2mn}=\frac{100\times 980}{2\times 5\times 10}=980\,cm/s\]


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