A bird is sitting on the floor of a closed glass cage and the cage is in the hand of a girl. Will the girl experience any change in the weight of the cage when the bird (i) starts flying in the cage with a constant velocity (ii) flies upwards with acceleration (iii) flies downwards with acceleration?




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the answer is option (II) flies upwards with acceleration .
because when it will fly upwards it will exert a force towards down . by the 3rd law of newton " every action has an equal an opposite reaction".

i hope it helps............