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
A) $1.5\ kg$
B) $2.5\ kg$
C) $3\ kg$
D) $4\ kg$
Explanation
(c) When the bird files, it pushes air down to balance its weight. So the weight of the bird and closed cage assembly remains unchanged
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.