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J & K CET Engineering J and K - CET Engineering Solved Paper-2008

  • question_answer
    The rate of mass of the gas emitted from rear of a rocket is initially\[0.1\text{ }kg/s\]. If the speed of the gas relative to the rocket is \[50\text{ }m/s\]and mass of the rocket is\[2\text{ }kg\], then the acceleration of the rocket (in\[m/{{s}^{2}}\]) is

    A)  \[5\]              

    B)  \[5.2\]

    C)  \[2.5\]            

    D)  \[25\]

    Correct Answer: C

    Solution :

    \[a=\frac{\Delta v}{\Delta t}=\frac{v}{m}.\frac{\Delta m}{\Delta t}\] \[=\frac{50}{2}\times 0.1\] \[=2.5m/{{s}^{2}}\]


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