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AMU Medical AMU Solved Paper-2006

  • question_answer
    A body initially at rest is moving with uniform acceleration a. Its velocity after n sec is v. The displacement of the body in last 2 s is

    A)   \[\frac{2v(n-1)}{n}\]                    

    B)  \[\frac{v(n-1)}{n}\]

    C)  \[\frac{v(n+1)}{n}\]                      

    D)  \[\frac{2v(n+1)}{n}\]

    Correct Answer: A

    Solution :

                                    Displacement in last 2 s                 \[=\frac{1}{2}a{{n}^{2}}-\frac{1}{2}a\,{{(n-2)}^{2}}\]                 \[=2\,a\,(n-1)\] Acceleration \[a=\frac{v}{n}\]    \[(\because t=n\sec )\] Displacement in last \[2\,s=\frac{2\,v\,(n-1)}{n}\]


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