JEE Main & Advanced Physics Work, Energy, Power & Collision / कार्य, ऊर्जा और शक्ति Question Bank Conservation of Energy and Momentum

  • question_answer
    A bullet is fired from a rifle. If the rifle recoils freely, then the kinetic energy of the rifle is [AIIMS 1998; JIPMER 2001; UPSEAT 2000]

    A)                 Less than that of the bullet

    B)                 More than that of the bullet

    C)                 Same as that of the bullet

    D)                 Equal or less than that of the bullet

    Correct Answer: A

    Solution :

                        \[E=\frac{{{P}^{2}}}{2m}.\]If P = constant then \[E\propto \frac{1}{m}\] i.e. kinetic energy of heavier body will be less. As the mass of gun is more than bullet therefore it possess less kinetic energy.


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