To find the acceleration of an object if you know its velocity, you need additional information, specifically the change in velocity (Δv) and the corresponding time interval (Δt) during which the velocity change occurs. Acceleration (a) is defined as the rate of change of velocity, so you can calculate it using the following equation:
a = Δv / Δt
The formula above represents the average acceleration over the given time interval. It calculates the change in velocity divided by the change in time.
It's important to note that this equation gives you the average acceleration over the entire time interval. If you want to determine the instantaneous acceleration at a specific moment, you would need to use calculus and consider the object's changing velocity over an infinitesimally small time interval.
Make sure to use consistent units for velocity (Δv) and time (Δt) to obtain the acceleration in the correct units. For example, if the velocity is given in meters per second (m/s) and the time in seconds (s), the resulting acceleration will be in meters per second squared (m/s²).