Acceleration is defined as:
A. A change in speed.
Acceleration occurs when an object's velocity changes. It can involve speeding up (positive acceleration), slowing down (negative acceleration or deceleration), or changing direction. For example, when a car speeds up from rest at a traffic light, it experiences acceleration. Similarly, when a plane slows down during landing, it undergoes deceleration, which is also a form of acceleration. Acceleration is a vector quantity, meaning it has both magnitude (how much the speed changes) and direction. It is represented in physics equations by the symbol "a" and is measured in units such as meters per second squared (m/s²).
