Final answer:
The SI unit of acceleration is m/s², representing the change in velocity in meters per second for every second that passes.
Step-by-step explanation:
The SI unit of acceleration is m/s², which stands for meters per second squared or meters per second per second. This unit describes how the velocity changes in terms of meters per second every second. Since acceleration is the rate at which velocity changes over time, where velocity is measured in meters per second and time in seconds, the appropriate unit for measuring acceleration is therefore m/s². An example of acceleration is gravitational acceleration on Earth's surface, which is 9.8 m/s².