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# What is the difference between speed and velocity?

**Speed**

The **speed** is essentially the
**physical quantity** that tells us how fast or slow an object moves. The speed of
an object is defined as “the rate of change of its distance with respect to
time”. Mathematically,

**speed = distance/time**.

It is a **scalar quantity**. It
requires the only magnitude to define it.

Since speed = distance/time, there can
be numerous units. For example, km/h, km/s, m/s, m/h, etc. These all are valid
in only some situations. For example, **speed of light**, since very fast, is
represented in **km/s** and speed of a snail, since very slow, is represented in
m/h. But the SI unit of speed is given by **m/s**.

For example, if a car takes 20 seconds to travel 200 meters then the speed of the car is 200/20 = 10 m/s

**Velocity**

Velocity is defined as the rate of change of
**displacement** with respect to **time**. It is the speed at which an object moves
in a particular direction. It is a **vector quantity**. It needs both magnitude and
direction to represent it. The SI unit of velocity is **m/s**.

Mathematically, velocity is given as

**V = distance/time**

Where, v = velocity, d = distance, t = time.