Keeping the significant figures in view, the sum of the physical quantities 52.01 ~m , 153.2 ~m and 0.123 m is :

Step-by-step solution

When adding measurements, the result must be limited to the least number of decimal places among all quantities. The measurements are: 52.01 m (2 decimal places), 153.2 m (1 decimal place), and 0.123 m (3 decimal places). The limiting factor is 1 decimal place. Calculating the sum: 52.01 + 153.2 + 0.123 = 205.333 m. Rounding to 1 decimal place gives 205.3 m, which is option (1).