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NEET Sample Paper NEET Sample Test Paper-79

  • question_answer
    If a bomb of mass 30 kg at rest explodes into two pieces of mass 12 kg and 18 kg. The velocity of 18 kg mass is 6 m/s, then the kinetic energy of other mass is

    A)  486 J              

    B)  972 J

    C)  1944 J             

    D)  None of these

    Correct Answer: A

    Solution :

    Let velocity of 12 kg block is v, then by linear momentum conservation \[30\times 0=12\times v+18\times 6\] \[\operatorname{v}=-\,9m/s\] (- ve sign indicates direction of velocity) So, kinetic energy of 12 kg mass \[=\,\,\,\,\frac{1}{2}\,m{{v}^{2}}\] \[=\,\,\,\,\frac{1}{2}\,\times 12\times {{(9)}^{2}}\] \[=\,\,\,486\,J\]


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