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NEET AIPMT SOLVED PAPER SCREENING 2010

  • question_answer
    A particle has initial velocity \[(3\mathbf{\hat{i}}+4\mathbf{\hat{j}})\] and has acceleration \[(0.1\mathbf{\hat{i}}+0.3\mathbf{\hat{j}})\]. Its speed after 10 s is

    A) 7 unit

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

    C)        8.5 unit                

    D)        10 unit

    Correct Answer: B

    Solution :

    From first equation of motion \[v=u+at\] \[v=3\mathbf{\hat{i}}+4\mathbf{\hat{j}}+10(,4\mathbf{\hat{i}}+0.3\widehat{\mathbf{j}})\] \[v=7\mathbf{\hat{i}}+7\mathbf{\hat{j}}\] \[|v|=7\sqrt{2}.\]


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