The following graph of velocity versus time represents that of an automobile that travels in a straight line. From this graph, one can conclude that:

The true statement is that the acceleration in the first two seconds is 6 m/s^2.
The term acceleration is defined as the rate of change of velocity with time. The graph as shown is a velocity time graph. The graph shows the changes that occur in the velocity over a given time interval.
Now we have;
Initial velocity = 0 m/s
Final velocity = 12 m/s
Time taken = 2s
Acceleration = 12 - 0/2
= 6 m/s^2
Thus the true statement is that the acceleration in the first two seconds is 6 m/s^2.
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