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CMC Medical CMC-Medical VELLORE Solved Paper-2011

  • question_answer
    A vehicle of mass 120 kg is moving with a uniform velocity of 108 km/h. The force required to step the vehicle in 10 s is

    A)  90 N                                     

    B)  180 N

    C)  360 N                                   

    D)  720 N

    E)  810 N

    Correct Answer: B

    Solution :

                                    \[v=108\times \frac{5}{18}m\text{/}s\] \[=30\,m\text{/}s\] Momentum = 120 x 30 kg-m/s (initial) Final momentum = 0 \[\text{Force}=\frac{\text{change}\,\text{in}\,\text{momentum}}{\text{time}}\]                 \[=\frac{120\times 30}{20}=180\,N\]


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