Changing Speed

Measuring Acceleration:

The acceleration or deceleration of an object is the change in speed per second. It's a measure of how quickly an object speeds up or slows down.

Acceleration is only measured in metres per second squared:

acceleration = change in speed / time taken for change 

Acceleration can involve a change of direction as well as speed. It is a vector quantity.

Relative Speed:

Example 1:

Two cyclists move towards each other at speeds of 4m/s…