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JCECE Engineering JCECE Engineering Solved Paper-2004

  • question_answer
    A ball weighing \[2\,\,kg\]and speed\[6\,\,m/s\]collides with another ball of \[4\,\,kg\] moving in opposite direction with speed of \[3\,\,m/s\]. They combine after the collision. The speed of this combined mass in \[m/s\] is:

    A) \[4\]                                     

    B) \[2\]

    C) \[0\]                                     

    D) \[3\]

    Correct Answer: C

    Solution :

    By the law of conservation of momentum                 \[2\times 6-4\times 3=(2+4)v\] \[\Rightarrow \]                               \[6v=12-12\] \[\Rightarrow \]                                  \[v=0\]


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