Use the formula: acceleration = change in velocity / time taken
Write it as: a = (v – u) / t
Identify the initial velocity, u
Identify the final velocity, v
Find the time interval, t
Subtract initial velocity from final velocity
Divide the result by the time interval
Use SI units: m/s²
If velocity decreases, acceleration is negative
If velocity stays the same, acceleration is zero
If force and mass are known, use: a = F / m