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Railways NTPC (Technical Ability) Engineering Mechanics and Strength of Materials Question Bank Engineering Mechanics

  • question_answer
    A bullet enters a plank of 30 mm thickness with a velocity of 100 m/s and emerges out from the plank with a velocity of 50 m/s. What is the minimum thickness of the plank so that the bullet remain embedded in the plank:                       

    A) 100 mm           

    B) 80 mm           

    C) 60 mm             

    D) 40 mm         

    Correct Answer: C

    Solution :

    \[{{m}_{1}}{{v}_{1}}{{x}_{1}}={{m}_{2}}{{v}_{2}}{{x}_{2}}\] \[{{m}_{1}}={{m}_{2}}\] \[100\times 30=50\times {{x}_{2}}\] \[{{x}_{2}}=60\,\,mm\]


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