The unit of measurement commonly used to measure the distance traveled by a car is kilometers (km) or miles (mi).
-- ruler -- tape measure -- meter stick -- yardstick -- car's odometer -- laser rangefinder -- split-image rangefinder
A RADAR gun is typically used by police to measure the speed of an auto. Using stop watches to measure the elapsed time over a known distance would also give the average speed. A dynamometer can also be used to measure tire rotation in a stationary situation and be converted to an equivalent speed.
A tape measure.
Distance
An odometer measures the distance traveled in a car by tracking the number of rotations of the vehicle's wheels. The odometer is typically displayed on the dashboard and provides the driver with information on the total distance the car has traveled.
trundle wheel
The odometer.
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.
Meter ruler, trundlewheel, odometer (distance in car)
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pressure gauge