The additional information needed to determine the velocity of the elevator is the direction of motion
Explanation:
The difference between speed and velocity is the following:
- Speed is a scalar quantity that gives a measure of how fast an object is moving, regardless of its direction. It is calculated as the ratio between the distance covered and the time taken:
[tex]speed = \frac{distance}{time}[/tex]
- Velocity is a vector quantity, defined as the ratio between the diplacement of the object and the time taken:
[tex]velocity = \frac{displacement}{time}[/tex]
Being a vector, velocity has both a magnitude (which is the speed) and a direction.
Therefore, in order to determine the velocity of the elevator, we must know:
- Its speed (which we alreay know, 4.5 m/s)
- The direction of motion
So the missing information is the direction of motion.
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