The differences between acceleration and retardation are as follows —
| Acceleration | Retardation |
|---|---|
| If the velocity of a body increases with time, it is called acceleration. | If the velocity of a body decreases with time, it is called retardation. |
| As it is an increase in velocity per second it is positive acceleration. | As it is a decrease in velocity per second so retardation is negative acceleration. |
