Acceleration (a) = (Final velocity (v) - Initial velocity (u)) / Time (t)
Given:
Initial velocity (u) = 20 meters per second
Final velocity (v) = 29 meters per second
Time (t) = 3 seconds
Substituting the values, we get:
a = (29 m/s - 20 m/s) / 3 s
Calculating the acceleration:
a = 9 m/s / 3 s
a = 3 m/s²
Therefore, the acceleration of the car is 3 meters per second squared.