You measure two quantities as A = 1.0 m ± 0.2 m, B = 2.0 m ± 0.2 m. We should report correct value for √AB as

Q. You measure two quantities as A = 1.0 m ± 0.2 m, B = 2.0 m ± 0.2 m. We should report correct value for √AB as:

1. 1.4 m ± 0.4 m
2. 1.41m ± 0.15 m
3. 1.4m ± 0.3 m
4. 1.4m ± 0.2 m

Answer: 1.4m ± 0.2 m