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JEE Main & Advanced Physics Work, Energy, Power & Collision / कार्य, ऊर्जा और शक्ति Question Bank Work Done by Constant Force

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

    A)             18 units

    B)               15 units

    C)             12 units

    D)               10 units

    Correct Answer: D

    Solution :

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


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