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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2005

  • question_answer
        A lift is moving down with acceleration a. Aman in the lift drops a ball inside the lift. The acceleration of the ball as observed by the man in the lift and a man standing stationary on the ground are respectively:

    A)  \[g,g\]

    B)  \[g-a.\text{ }g-a\]

    C)  \[g-a,g\]

    D)  \[a,g\]

    Correct Answer: C

    Solution :

                    Apparent weight of ball \[w=w-R\] \[R=ma\] acts upward\[=ma\] \[w=mg-ma=m(g-a)\] Hence, apparent acceleration in the lift is\[g-a\] Now if the man is standing stationary on the ground, then the apparent acceleration of the falling ball is g.


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