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) flies upward in the cage with an acceleration of 2 m/s2 . The spring balance will now record a weight of
(a) 24 N
(b) 25 N
(c) 26 N
(d) 27 N
Ans: (c)