Answer:
Speed
Step-by-step explanation:
- Speed is a scalar quantity that represents the rate of change of distance. It is calculated as
where
d is the distance travelled by the object (regardless of its direction)
t is the time elapsed
The speed is measured in meters per second (m/s). We can also notice that speed is different from velocity: in fact, speed is a scalar quantity (magnitude only), while velocity is a vector quantity (magnitude+direction).