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AMU Medical AMU Solved Paper-2003

  • question_answer
    A body of mass 1 kg crosses a point \[o\] with a velocity \[\text{6}0\text{ m}{{\text{s}}^{-1}}.\] A force of 10 N directed  towards \[o\] begins to act on it. It will again cross O in

    A)  24 s                                      

    B)  12 s                           

    C)   6 s                                        

    D)  will never return to O

    Correct Answer: B

    Solution :

                     From Newtons second law                                  F = ma \[\Rightarrow \]               \[a=\frac{F}{m}=\frac{10}{1}m/{{s}^{2}}\] Since, the body returns to the point 0 under a force, its displacement is zero. From equation of motion, we have \[s=ut+\frac{1}{2}a{{t}^{2}}\] \[0=60\,t-\frac{1}{2}\times 10\times {{t}^{2}}\Rightarrow \,t=12\,s\]


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