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WB JEE Medical WB JEE Medical Solved Paper-2012

  • question_answer
    A bullet on penetrating 30 cm into its target loses its velocity by 50%. What additional distance will it penetrate into the target before comes to rest?

    A)  30 cm          

    B)  20 cm

    C)  10 cm          

    D)  5 cm

    Correct Answer: C

    Solution :

     Given \[S=30\,cm=30\times {{10}^{-2}}m\]and loss in velocity is 50% Equation of motion \[{{v}^{2}}={{u}^{2}}+2as\] Here,      \[\frac{{{u}^{2}}}{4}={{u}^{2}}+2a\times 30\times {{10}^{-2}}\] ?(i) \[0=\frac{{{u}^{2}}}{4}+3a\times x\] ?(ii) On solving Eqs. (i) and (ii), we get \[x=10\,cm\]


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