Final answer:
The correct units of acceleration are meters per second squared (m/s²), representing the change in meters per second every second.
Step-by-step explanation:
The units of acceleration are given as a rate of change of velocity over time. Since velocity is measured in meters per second (m/s) and time is measured in seconds (s), acceleration is calculated by dividing the velocity by time. This results in the SI units for acceleration being meters per second squared (m/s²), which indicates how many meters per second the velocity changes every second. Therefore, the correct unit of acceleration from the provided options is m/s². To remember this, it's helpful to know that the gravitational acceleration on Earth's surface is approximately 9.8 m/s².