A bird weighs 2 kg and is inside an airt...

A bird weighs 2 kg and is inside an airtight cage of 1 kg. If its starts to fly, then what is the weight of the bird and cage assembly?

3 kg

2 kg

1 kg

none of these

Text Solution

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The correct Answer is:

When the bird flies, the upthrust on it is equal and opposite to the down thrust on the cage. Therefore, the weight of the assembly remains unchanged.

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