Question

The instrument panel in a car usually has a display in units of kilometres or miles per hour. The displayed value tells you which of the following properties of the car?

magnitude of acceleration
velocity and acceleration
magnitude of velocity
velocity

Answer 1

Units of kilometres per hour and miles per hour are used for speed and velocity. This exclude first and second answer.

The instrument panel shows only positive numbers. This is magnitude of velocity.
The last answer is not correct because in order to show velocity we also need to show direction in which it applies.