In physics, "constant retardation" is a term used to describe a situation where an object's velocity is decreasing at a steady rate. It's essentially the same thing as constant deceleration.

Here's a breakdown:

* Retardation: A synonym for deceleration, it refers to the rate at which an object slows down.

* Constant: This implies that the rate of deceleration is uniform. The object is slowing down by the same amount every second.

Key Characteristics of Constant Retardation:

* Negative acceleration: The acceleration value is negative, indicating a decrease in velocity.

* Uniform decrease in velocity: The object's velocity decreases by the same amount in equal time intervals.

* Linear relationship between velocity and time: If you plot the object's velocity against time, you'll get a straight line with a negative slope.

Example:

Imagine a car braking to a stop. If the car brakes at a constant rate, its deceleration is constant. This means its speed is decreasing by the same amount each second until it comes to a complete stop.

Note: While "retardation" is still used in some contexts, it's becoming less common. The preferred term in modern physics is "deceleration" as it avoids potential misinterpretations.