0 m/s^2.
An object travels 12 m in the 1st second of travel, 12 m again during the 2nd second of travel, and 12 m again during the 3rd second. Its acceleration is therefore 0 m/s2.
Given
In First second object travels 12 m
in second second it travels 12 m
In 3rd second it travels 12 m
After observation, the object travels the same distance in the same amount of time, indicating constant velocity motion in a straight line with no acceleration.
Therefore acceleration = 0 m/s^2
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