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In the above graph, from t = 2 to t = 5, the acceleration at 1 m/s^2 but from t = 6 to t = 7, the acceleration will be zero that means no acceleration so that the velocity is constant.

From time t = 2 to t = 5, acceleration is 1 m/s^2, so that the change in velocity will be the area of rectangle ABCD represented by the green rectangle box in the graph.

Therefore, Change in velocity = Area of rectangle ABCD

= 1 x (5 - 2) = 1 x 3 = 3 m/s.

We know that the area of the shape formed in the graph is velocity in acceleration-time graph.

So that the area of rectangle = 3 x (4-2) = 3 x 2 = 6 m/s

We know that the area of the shape formed in the graph is the velocity in acceleration-time graph.

So that the area of triangle = ½ (3)(2) = 3 m/s