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JEE Main & Advanced Physics Vectors Question Bank Multiplication of Vectors

  • question_answer
    A force \[\overrightarrow{\text{F}}=5\hat{i}+6\hat{j}+4\hat{k}\] acting on a body, produces a displacement \[\overrightarrow{\text{S}}=6\hat{i}-5\hat{k}.\]Work done by the force is                 [KCET 1999] 

    A)                 10 units

    B)                 18 units

    C)                 11 units

    D)                 5 units

    Correct Answer: A

    Solution :

                        \[W=\bar{F}.\bar{s}=(5\hat{i}+6\hat{j}+4\hat{k})(6\hat{i}-5\hat{k})=30-20=10\]J


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