Measure of two quantities along with the precision of respective measuring instruments is A = 2.5 ms-1= 0.5 ms-1,    B = 0.10s ±0.01s. The value of AB will be

A = 2.5 ms-1±0.5 ms-1,    B = 0.10s±0.01sx = AB = (2.5)(0.10) = 0.25 m△xx= △AA+△BB = 0.52.5+0.010.10= 0.05+0.0250.25 = 0.0750.25△x = 0.075 = 0.08 m Rounding off to two significant figuresAB = (0.25 ± 0.08) m