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JEE Main & Advanced AIEEE Solved Paper-2009

  • question_answer
    A particle has an initial velocity of\[3\hat{i}+4\hat{j}\]and an acceleration of\[0.4\hat{i}+0.3\hat{j}\]. It speed after 10 s is:     AIEEE  Solved  Paper-2009

    A) 10 units                               

    B) \[7\sqrt{2}\] units                           

    C) 7 units  

    D)        8.5 units.

    Correct Answer: B

    Solution :

    \[\overrightarrow{V}=\overrightarrow{u}+\overrightarrow{at}\] \[\overrightarrow{V}=(3\hat{i}+4\hat{j})+10(0.4\hat{i}+0.3\hat{j})\] \[\overrightarrow{V}=7\widehat{i}+7\hat{j}\] \[\Rightarrow \] \[|\overrightarrow{V}|=7\sqrt{2}\]


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