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RAJASTHAN PMT Rajasthan - PMT Solved Paper-1996

  • question_answer
    An elastic ball is released from height of 100 m, and on colliding with earth its 20% energy is dissipated, the height to which ball rebounds:

    A)  \[80m\]                                              

    B)         \[40\text{ }m\]               

    C)        \[60\,m\]                                            

    D)         \[20\,m\]

    Correct Answer: A

    Solution :

    Height obtained in first \[{{h}_{1}}={{e}^{2}}h\],  \[e=\sqrt{\frac{80}{100}}\] \[{{h}_{1}}=\frac{80}{100}\times 100=80m\]


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