Which of the following has unit m/s2 ?

The correct answer is option 3. Acceleration.

The physical quantity that has the unit m/s² is Acceleration.

Acceleration is a vector quantity that represents the rate of change of velocity over time. It is measured in meters per second squared (m/s²), indicating the change in velocity (in meters per second) per unit of time (in seconds). Therefore, m/s² is the unit of acceleration.