Final answer:
The new stopwatch with an uncertainty of ±0.05 seconds is not ideal for timing sprints where results can be within hundredths of a second, as the device's accuracy is insufficient for such small time differences.
Step-by-step explanation:
The accuracy of a stopwatch is critical in events such as the 50-yard dash, where winners often edge out competitors by mere hundredths of a second. Considering the new stopwatch has an uncertainty of ±0.05 seconds, it may not sufficiently discern the small time differences between sprinters, for instance, between the first place (12.04 s) and second place (12.07 s) at a track meet. In competitive sprinting, even a hundredth of a second can be the difference between first and second place, implying that a more precise timing device might be necessary for accurate results.