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CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2010

  • question_answer
    A force\[(4\hat{i}+\hat{j}-2\hat{k})N\]acting on a body maintains its velocity at\[(2\hat{i}+2\hat{j}+3\hat{k})m{{s}^{-1}}\]. The power exerted is

    A)  4W        

    B)                         5W

    C)  2W                       

    D)         8W

    E)  1W

    Correct Answer: A

    Solution :

    \[P=F.v\] \[=(2\hat{i}+\hat{j}-2\hat{k})(2\hat{i}+2\hat{j}+3\hat{k})\] \[=8+2-6\] \[P=4\text{ }W\]


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