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

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4-1.Newton's Laws of Motion

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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 ........... $kg$

A

$1.5$

B

$2.5 $

C

$3 $

D

$4 $

Solution

(c)When the bird flies, it pushes air down to balance its weight.

So the weight of the bird and closed cage assembly remains unchanged.

Standard 11

Physics

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