JEE Main Physics question
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
Answer: (C)
Solution
Before flying, the reading (25 N) equals the weight of the cage plus the bird at rest; the cage's own weight is 25 − mg = 25 − 0.5×10 = 20 N. While the bird accelerates upward at 2 m/s² (inside the closed cage), it must push down
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