What is the SI unit of acceleration?

The SI unit of acceleration is expressed in meters per second squared, denoted as m/s². This unit captures the rate of change of velocity with respect to time. Specifically, acceleration measures how much the velocity of an object increases or decreases every second. For instance, if an object's velocity changes from 0 m/s to 10 m/s in 5 seconds, its acceleration would be 2 m/s², indicating that its speed increases by 2 meters per second for each passing second.

Other options represent different physical quantities. M/s denotes velocity, which is the speed of an object in a particular direction. M²/s, which combines square meters and seconds, does not conform to a standard physical unit associated with acceleration. Km/s would indicate speed in kilometers per second, which is also not a measurement of acceleration. Thus, m/s² stands out as the only correct unit for acceleration in the SI system.