Speed is the rate at which an object's position changes. It is a scalar quantity, meaning that it has magnitude (speed) but no direction.

The speed of an object can be calculated by dividing the distance it travels by the time it takes to travel that distance. The formula for speed is:

```

speed = distance/time

```

- where speed is measured in units such as meters per second (m/s), kilometers per hour (km/h), or miles per hour (mph).

- distance is measured in units such as meters (m), kilometers (km), or miles (mi).

- time is measured in units such as seconds (s), hours (h), or minutes (min).

Velocity

Velocity is a vector quantity that has both magnitude (speed) and direction. The direction of velocity is the direction in which the object is moving.

The velocity of an object can be calculated by dividing the object's displacement by the time it takes to travel that displacement. Displacement is the change in the object's position in a straight line from its starting point to its ending point. The formula for velocity is:

```

velocity = displacement/time

```

- where velocity is measured in units such as meters per second (m/s), kilometers per hour (km/h), or miles per hour (mph).

- displacement is measured in units such as meters (m), kilometers (km), or miles (mi).

- time is measured in units such as seconds (s), hours (h), or minutes (min).