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JEE Main & Advanced Physics NLM, Friction, Circular Motion Question Bank Critical Thinking Questions

  • question_answer
    A ship of mass \[3\times {{10}^{7}}\,kg\] initially at rest is pulled by a force of \[5\times {{10}^{4}}\,N\] through a distance of 3 m. Assume that the resistance due to water is negligible, the speed of the ship is [IIT 1980; MP PMT 2000]            

    A)             1.5 m/s            

    B)               60 m/s            

    C)             0.1 m/s            

    D)               5 m/s

    Correct Answer: C

    Solution :

                    \[{{v}^{2}}=2as=2\left( \frac{F}{m} \right)\ s\]     \[[As\ u=0]\]             Þ \[{{v}^{2}}=2\left( \frac{5\times {{10}^{4}}}{3\times {{10}^{7}}} \right)\times 3=\frac{1}{100}\]             Þ \[v=0.1\ m/s\]            


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