NEET Sample Paper NEET Sample Test Paper-15

  • question_answer A body of mass 4 kg moving with velocity 12 m/s collides with another body of mass 6 kg at rest. If the two bodies stick together after collision, then the loss of kinetic energy of the system is

    A)  0                                

    B)  288 J

    C)  172.8 J                      

    D)  144 J

    Correct Answer: C

    Solution :

    Loss in \[KE=\frac{{{m}_{1}}{{m}_{2}}}{2({{m}_{1}}+{{m}_{2}})}{{({{u}_{1}}{{u}_{2}})}^{2}}\] \[=\frac{4\times 6}{2\times 10}{{(12-10)}^{2}}=172.8\,J\] Hence, the correction option is [c].

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