JEE Main & Advanced Physics Two Dimensional Motion Question Bank Self Evaluation Test - Motion in a Plane

  • question_answer
    If a unit vector is represented by \[0.5\widehat{i}+0.8\widehat{j}+c\widehat{k}\,,\] then the value of c is

    A) 1         

    B)                    \[\sqrt{0.8}\]

    C) \[\sqrt{0.11}\]   

    D)        \[\sqrt{0.01}\]

    Correct Answer: C

    Solution :

    [c] \[\sqrt{{{0.5}^{2}}+{{0.8}^{2}}+{{c}^{2}}}=1\] or  \[c=\sqrt{1-0.89}=\sqrt{0.11}\]


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