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False: when reporting speed, only value and units are needed, not the direction
Explanation:
Let's start by reminding the difference between speed and velocity:
- Speed is a scalar quantity which tells "how fast" an object is moving, regardless of its direction of motion.
It can be calculated as: follows:
where :
d is the distance travelled
t is the time interval
Therefore, speed has no direction, so it is written only as a value followed by units: for example, 5 m/s.
- Velocity is a vector quantity given by:
where :
d is the displacement of the object (which is a vector connecting the initial position to the final position of motion)
t is the time interval
Since it is a vector, velocity has both magnitude and direction, therefore it also takes into account the direction of motion of the object. An example of velocity is 5 m/s east, where the direction is also specificied.
Learn more about speed and velocity:
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