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  4. A boy of 50 kg is standing in a lift moving down with an acceleration 9.8 m/s2 . The apparent weight of the boy will be

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Q. A boy of $ 50\,\,kg $ is standing in a lift moving down with an acceleration $ 9.8\,\,m/{{s}^{2}} $ . The apparent weight of the boy will be

Punjab PMETPunjab PMET 1999

Solution:

Mass of the boy $ m=50\,\,kg $ Downwards acceleration of lift $ a=9.8\,\,m/{{s}^{2}} $ Apparent weight of the boy when the lift is moving downwards is given by $ W=m(g-a)=50(9.8-9.8)=0 $