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Q.

 A bird weighs 2 kg and is inside a closed cage of 1 kg. If it starts flying, then what is the weight of the bird and cage assembly

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a

1.5 kg

b

4 kg

c

2.5 kg

d

3 kg

answer is C.

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Detailed Solution

 When the bird flies, it pushes air down to balance its weight. So the weight of the bird and closed cage assembly remains unchanged.

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