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JEE Main & Advanced Physics Vectors Question Bank Multiplication of Vectors

  • question_answer
    If force \[(\overrightarrow{F})=4\hat{i}+5\hat{j}\]and displacement \[(\overrightarrow{s})=3\hat{i}+6\hat{k}\] then the work done is                                              [Manipal 1995]

    A)                 \[4\times 3\]     

    B)                 \[5\times 6\]

    C)                 \[6\times 3\]     

    D)                 \[4\times 6\]

    Correct Answer: A

    Solution :

                        \[W=\vec{F}\ \vec{S}\]\[=(4\hat{i}+5\hat{j})(3\hat{i}+6\hat{j})=12\]


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