Speed is a scalar quantity indicating how fast an object is moving, defined by the equation
[tex]speed = \frac{distance}{time}[/tex]
Explanation:
Speed is a scalar quantity which tells how fast an object is moving, regardless of its direction.
The speed of an object can be calculated as follows:
[tex]speed = \frac{d}{t}[/tex]
where
d is the distance covered by the object
t is the time interval taken by the object to cover that distance
The SI units of the speed is the metre per second (m/s).
Speed must not be confused with velocity, which is instead a vector quantity, given by
[tex]velocity = \frac{displacement}{time}[/tex]
where displacement is a vector measuring the distance in a straight line between the initial and final position of the object. Since velocity is a vector, the direction matters, therefore an object can have different speed and velocity. For instance, an object completing a full circle has non-zero speed (because the distance covered is non-zero), but its velocity is zero (since the displacement is zero, because the object returns to its starting position).
Learn more about speed and velocity:
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