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NEET Sample Paper NEET Sample Test Paper-60

  • question_answer
    A bullet of mass m moving with velocity v block strikes a suspended wooden block of mass M. If the block rises to a height h. The initial velocity of the block will be:

    A) \[\sqrt{2gh}\]                 

    B) \[\frac{M+m}{m}\sqrt{gh}\]

    C) \[\frac{m}{m+M}(2gh)\]            

    D) \[\frac{M+m}{M}\sqrt{2gh}\]

    Correct Answer: D

    Solution :

    [d] Apply momentum of conservation (before collision) \[{{P}_{1}}={{P}_{2}}\] (after collision) \[mv=(M+m)\,V\] \[V=\sqrt{2gh}\,\,\,put\,this\,in\,(1)\] \[\sqrt{2gh}=\frac{mv}{M+m}\] \[V=\frac{M+m}{m}\sqrt{2gh}\]


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