Physics

If velocity decreases with time, it's often called deceleration or negative acceleration.

Here:
* u is the initial velocity (starting velocity).
* v is the final velocity (ending velocity).
* a is the uniform acceleration.
* t is the time taken.
* s is the distance travelled.

If the velocity decreases (meaning negative acceleration), the equations become:
1. v = u - at
2. s = ut - (1/2)at²
3. v² = u² - 2as

Graphical representation is a powerful way to visualize the motion of a point, body, or particle. We often look at different types of graphs, like displacement-time, velocity-time, or acceleration-time, but we'll focus now on position-time graphs (which are also called displacement-time graphs, as displacement is a change in position).

A position-time graph plots the position (or displacement, 's') of an object on the vertical (y) axis against time ('t') on the horizontal (x) axis.

Acceleration is defined as the time rate of change of velocity.
It's a vector quantity, meaning it has both magnitude and direction.
The SI unit for acceleration is m/s². It's denoted by 'a'.

When an object's velocity changes, it's accelerating. This change can be in speed, direction, or both.