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NEET Sample Paper NEET Sample Test Paper-22

  • question_answer
    A lift is moving down with acceleration a. A man 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  respectively:   

    A) \[g,g\]                          

    B) \[g-a,\,g-a\]      

    C)      \[g-a,\,g\]         

    D)      \[a,g\]                                      

    Correct Answer: C

    Solution :

    Let apparent weight of ball from the frame of the lift\[=w'\] \[\therefore \]    \[w'=w-R\] Where, the pseudo force, R = ma acts upward \[\therefore \]\[w'=mg-ma=m(g-a)\] Hence apparent acceleration in the lift is g - a. No if the man is standing stationary on the ground, then the apparent acceleration of the falling ball is g. Hence, the correction option is [c].


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