A bird weighs 2kg and is inside a closed case of 1 Kg. If it starts flying then what is the weight of the bird and cage assmbly
(A) 1.5 kg (B) 2.5kg (C) 3 kg (D) 4kg

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Solution

Correct Answer: C 3kg

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.
So the total weight is simply the sum of weight of bird and cage,
ie,
weight = 2+1 =3 kg

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A bird weighs 2kg and is inside a closed case of 1 Kg. If it starts flying then what is the weight of the bird and cage assmbly (A) 1.5 kg (B) 2.5kg (C) 3 kg (D) 4kg

Correct Answer: C 3kg 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. So the total weight is simply the sum of weight of bird and cage, ie, weight = 2+1 =3 kg

A bird weighs 2kg and is inside a closed case of 1 Kg. If it starts flying then what is the weight of the bird and cage assmbly
(A) 1.5 kg (B) 2.5kg (C) 3 kg (D) 4kg

Correct Answer: C 3kg

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.
So the total weight is simply the sum of weight of bird and cage,
ie,
weight = 2+1 =3 kg