Centimetres and millimetres. In past times, it would have been feet and inches.
Meter
mm, cm or m.
That depends what aspect of the car you want to measure: for example its length, volume, mass, weight, color, etc.
Kilometer would be the best unit to measure the length of a car, as the length of a typical car is usually in the range of a few meters, making meters too small a unit for practical measurement.
carat
Cubic centimetres or cubic inches.
a tape measure of at least 25 feet or more
The unit that would best measure the distance of a matchbox car on a toy track is meters or centimeters, depending on the precision needed. These units are commonly used for measuring distances in science experiments and provide an accurate measurement of the car's movement along the track.
miles or kilometers
A scientist would typically use the unit "meters" or "kilometers" to measure the distance traveled by a car. These units are commonly used in scientific research and calculations for measuring distances.
I would use centimeters.
Kg or tonnes in metric. Pounds or tons in US units.