Answer:
 a = 0.701 m / s²
Step-by-step explanation:
As the game is spinning the acceleration is centripetal 
 a = v² /r 
 
The park system after a small period of acceleration goes at a constant speed, for which we can use the relations of the uniform motion 
 v = d / t 
the distance of a circle is 
 d = 2π r 
 
we substitute 
 a = (2π r / t) ² / r 
 a = 4 pi² r / t² 
 
let's calculate 
 a = 4 pi² 12 / 26² 
 a = 0.701 m / s²