## Average Speed

- Average speed can be calculated by dividing the total distance the object travels by the total amount of time it takes to travel that distance.

- While the speed of the object may vary during the total time it is moving, the
**average speed**is the result of the total distance divided by the total time taken. - Speed measurements contain a unit of distance divided by a unit of time. Examples of units of speed might include “meters per second” (m/s), “kilometers per hour” (km/h), or “miles per hour” (mph or mi/hr).
- Average speed can be calculated using the formula
**v=d/t**where the variables are:- v is the average speed of the object with units of m/s
- d is the total distance or length of the path of the object with units of m
- t is the total time taken to cover the path with units of s
- Speed cannot have a negative value.

## Calculating Average Speed

**Velocity**

(Speed and Direction)

**Velocity**refers to both the speed of an object and the direction of its motion.- A velocity value should have both speed units and direction units, such as m/sec north, km/h south, cm/s left, or km/min down.
- If an object is moving forward, it has
**positive velocity**. When an object is moving backwards, it has**negative velocity**.- When you throw a ball in the air, it has positive velocity. When it heads back towards you, it has negative velocity.

## Speed vs. Velocity vs. Acceleration

## Extended Learning

- Investigate how acceleration is the rate of change in velocity.
- Solve problems for time or distance. Click here for some sample problems

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