The S.I. unit of acceleration is

Acceleration is defined as the rate of change of velocity per unit of time. In the International System of Units (SI), velocity is measured in metres per second (m/s), and time is measured in seconds (s) [3]. Consequently, the SI unit for acceleration is derived by dividing velocity by time, resulting in metres per second squared, which is symbolically represented as m/s" or ms⁻² [1]. While other units like centimetres per second squared (cm/s") are used in the CGS system, or kilometres per hour squared in specific contexts, the standard SI coherent derived unit remains m/s" [3]. This unit literally signifies the change in velocity (in m/s) occurring every second.

Sources

1. [1] Science-Class VII . NCERT(Revised ed 2025) > Chapter 8: Measurement of Time and Motion > Speed = Total distance covered Total time taken > p. 113
2. [3] https://www.sciencedirect.com/topics/engineering/acceleration-unit
3. [2] Science-Class VII . NCERT(Revised ed 2025) > Chapter 8: Measurement of Time and Motion > 8.1.2 SI unit of time > p. 111