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NEET Sample Paper NEET Sample Test Paper-3

  • question_answer
    An object is acted upon by the forces, \[{{F}_{1}}=4\,\hat{i}\,N\] and \[{{F}_{2}}=(\,\hat{i}-j)\,N\]. If the displacement of the object is \[D=(\hat{i}+6\hat{j}-6\hat{k})m.\]. The kinetic energy of the object.

    A)  remains constant

    B)  increased by 1 J

    C)  decreases by 1 J

    D)  decreases by 2 J

    Correct Answer: C

    Solution :

        The work done on the object \[W={{F}_{1}}D+{{F}_{2}}\]. D Where D is the displacement vector. \[\therefore \]\[w=4(1)+(1)\,(2)+(-1)\,(6)=-1J\] From work - energy theorem, \[w=K{{E}_{1}}-KE=-1J\] Here, we see that energy is decreased by U


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