Yes, that's correct! When the acceleration of a body is opposite in direction to its velocity, it means the body is slowing down.

Here's why:

* Acceleration is the rate of change of velocity. It can be a change in speed, direction, or both.

* Velocity is speed in a given direction.

Example: Imagine a car driving forward (positive velocity). If you apply the brakes, you are causing a deceleration (negative acceleration) opposite to the car's velocity. This causes the car to slow down.

Key points:

* When acceleration and velocity are in the same direction, the object speeds up.

* When acceleration and velocity are in opposite directions, the object slows down.

Let me know if you'd like to explore any other physics concepts!