Answer:
In a closed cage, the inside air is bound with the cage. (i) As the acceleration is zero, there is no change m the weight of the cage. (ii) In this case, the reaction R is given by \[R-Mg=Ma\] or \[R=M(g+a)\] Thus the cage will appear heavier than before. (iii) In this case, the reaction R is given by \[Mg-R=Ma\] or \[R=M(g-a)\] Thus the cage will appear lighter than before.
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