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AMU Medical AMU Solved Paper-2015

  • question_answer
    A body of mass 10 kg moves at a constant speed of \[10\,m/{{s}^{2}}\]. A constant force then acts for 4 second on the body and gives it a speed of 2 m/s in opposite direction. Magnitude of  the force acting on the body is

    A)  30N                                      

    B)  20N

    C)  15N                                      

    D)  10N

    Correct Answer: A

    Solution :

                    A constant force acts on body for 4 s \[\therefore \]  Acceleration \[=\frac{-2-10}{4}\]                                                                 \[=-3\,m/{{s}^{2}}\] Since,    force \[=m\times a\]                                 \[=10\times 3\]                                 = 30 N


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