J & K CET Engineering J and K - CET Engineering Solved Paper-2009

  • question_answer A child stands at one end of a boat moving with a speed v in still water. If the child starts running towards the other end of the boat with a speed u, the centre of mass of the system (boat and child) will move with a speed

    A)  \[v-u\]          

    B)  \[v\]

    C)  \[u\]              

    D)  \[v+u\]

    Correct Answer: B

    Solution :

    External force on the system is zero, therefore velocity of centre of mass does not change. It remains v.


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