We know that
• The initial speed is null because Mr. Pierce accelerates from rest.
,
• The final speed is 21.1 m/s.
,
• The distance traveled is 27.4 meters.
To find the acceleration, we use a formula that relates initial speed, final speed, acceleration, and distance.

Let's use the given magnitudes and solve for a.

Therefore, Mr. Pierce's acceleration is 8.12 m/s^2.