Q. A bird is sitting in a large closed cage which is placed on a spring balance. It records a weight of $25\ N$. The bird (mass $m = 0.5\ kg$) files upward in the cage with an acceleration of $2\ m/s^{2}$. The spring balance will now record a weight of
A) $24\ N$
B) $25\ N$
C) $26\ N$
D) $27\ N$
Explanation
(c) Reading =Weight of cage + Reaction by bird
$= 20 + 0.5(10 + 2) = 26\ N$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.