Q. A bird is sitting in a large closed cage which is placed on a spring balance. It records a weight of 5N. The bird of mass 0.5 kg files upward in the cage with an acceleration of $2\ ms^{- 2}$. The spring balance will now record a weight of

A) 4 N
B) 5 N
C) 6 N
D) 7 N
Explanation

(c) The effective weight $=$ weight of bird + reactional force due to acceleration of bird
$= 5 + ma = 5 + 0.5 \times 2 = 6\ N$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.