1. Acceleration

2. Acceleration – the rate at which velocity changes.
Means that an object accelerates if it’s speed, it’s direction, or both change.

3. Positive/Negative
An increase in velocity is called positive acceleration
A decrease in velocity is called negative acceleration or deceleration

4. formula
You can find the average acceleration by using the following formula:
Average acceleration = final velocity – starting velocity
Time it takes to change velocity

5. Example: If a girl is walking for 4 seconds, and her speed increases from 1 m/s to 5m/s, what is her acceleration? 5m/s – 1m/s = 1m/s/s 4 seconds