That statement is incorrect. An increase of speed during a given time interval is called acceleration, not negative acceleration.

Here's why:

* Acceleration is the rate of change of velocity. Velocity includes both speed and direction.

* Positive acceleration means the object is speeding up in the direction of its current velocity.

* Negative acceleration (also known as deceleration) means the object is slowing down or changing direction.

So, if an object is increasing its speed, it's experiencing positive acceleration.