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MGIMS WARDHA MGIMS WARDHA Solved Paper-2014

  • question_answer
    A particle is acted upon by a conservative force \[F=(7\hat{i}-6\hat{j})N\](no other force is acting on the particle). Under the influence of this force, particle moves from (0,0) to\[(-3w,4w),\]then

    A)  work done by the force is \[3J\]

    B)  work done by the force is \[-45\text{ }J\]

    C)  at (0, 0) speed of the particle must be zero

    D)  at (0, 0) speed of the particle must not be zero

    Correct Answer: B

    Solution :

                    Work done of the particle \[W=F.ds\]                 \[=(7\hat{i}-6\hat{i}).(3\hat{i}+4\hat{j})=-21-24\]                 \[W=-45J\]


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