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JEE Main & Advanced Physics Vectors Question Bank Multiplication of Vectors

  • question_answer
    A body, constrained to move in the Y-direction is subjected to a force given by \[\overrightarrow{F}=(-2\hat{i}+15\hat{j}+6\hat{k})\,N.\] What is the work done by this force in moving the body a distance 10 m along the Y-axis                                    [CBSE PMT 1994]

    A)                 20 J        

    B)                 150 J

    C)                 160 J     

    D)                 190 J

    Correct Answer: B

    Solution :

                        \[W=\vec{F}.\vec{r}\]\[=(-2\hat{i}+15\hat{j}+6\hat{k})(10\hat{j})=150\]


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