#### Answer

Periods 1 and 2 are equal and create the greatest change in velocity. Period 3 creates a smaller change in velocity.

#### Work Step by Step

Guided by the equation (Vf-Vi)=at, acceleration multiplied by time gives the same in velocity. In other words, the area of a acceleration vs time graph is the change in velocity. The area of both areas 1 and 2 are eight square units, and the area of period 3 is seven square units.