Determine which of the following measurements has a systematic error and which is random.
A length of 20 meters is measured using a meter scale, which is moved during the measurement.
The meter used to measure a length is 2 mm too short.
The balance used to measure a mass has an accuracy level of 1 %.
The kitchen scale shows accurate results only at room temperature 
. It is used to weigh a mass at an outdoor temperature of 
.
We measure time with a lagging clock.
