If everyone uses the same meter scale and reads it correctly, the results should be consistent. Differences arise from using various scales or incorrect readings, but a standard meter scale ensures uniform measurements.
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Human perception has limitations in measuring motion due to factors like reaction time, inability to discern very rapid or very slow speeds accurately, and subjective interpretation of movement, which can lead to errors and imprecise measurements.
Standard units ensure consistency and accuracy in measurements, making communication and comparison easier.