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RAJASTHAN ­ PET Rajasthan PET Solved Paper-2003

  • question_answer
    If \[\overrightarrow{F}=5\widehat{i}+3\widehat{j},\,\overrightarrow{r}=2\widehat{i}-\widehat{j},\], then work done by the system will be

    A)  \[-7\text{ }J\]           

    B)  7 J

    C)  10 J          

    D)  \[-10\text{ }J\]

    Correct Answer: B

    Solution :

     \[W=\overrightarrow{F}.\overrightarrow{r}=(5\hat{i}+3\hat{j}).(2i-\hat{j})\] \[W=7J\]


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