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EAMCET Medical EAMCET Medical Solved Paper-1997

  • question_answer
    A mass of 12 kg at rest explodes into two pieces of masses 4 kg and 8 kg, which move in opposite directions. If the velocity of 8 kg piece is 6 m/s. then the kinetic energy of the other piece in joule is:

    A)  64                                         

    B)  128

    C)  144                                       

    D)  288

    Correct Answer: D

    Solution :

                     Applying the principle of conservation of momentum \[Mv=m{{v}_{1}}+{{m}_{2}}{{v}_{2}}\] \[0=4\times {{v}_{1}}+8(-6)\] \[4{{v}_{1}}=48\] \[\therefore \]  \[{{v}_{1}}=12m/s\] Kinetic energy of other piece of 4 kg is given by \[=\frac{1}{2}\times 4\times {{(12)}^{2}}=288\,J\]


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