Here's why:

* CGS system: Stands for centimeter-gram-second, a system of units used in physics.

* Acceleration: The rate of change of velocity over time.

* Units of velocity: In the CGS system, velocity is measured in centimeters per second (cm/s).

* Units of time: Time is measured in seconds (s).

Therefore, the unit of acceleration, which is velocity divided by time, becomes centimeters per second squared (cm/s²).