JEE Main & Advanced Physics Work, Energy, Power & Collision / कार्य, ऊर्जा और शक्ति Sample Paper Topic Test - Work Energy Power

  • question_answer
    A person brings a mass of 1 kg from infinity to a point 'A'. Initially the mass was at rest but it moves at a speed of 2m/s as it reached A. The work done by the person on the mass is -3J. The potential at 'A' is:               

    A) \[-3J/kg\]

    B) \[-2J/kg\]

    C) \[-5J/kg\]

    D) none of these

    Correct Answer: C

    Solution :

    \[-3=1({{V}_{A}}-0)+\frac{1}{2}\times 1\times {{(2)}^{2}}-0\]
      \[\therefore \]\[{{V}_{A}}=-5J/kg\]

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