The object is moving at a constant velocity between time 4 s to 6 s. The correct answer is option A
Velocity - Time Graph
This is the graph of velocity plotted against time. The slope of the graph is acceleration and the area under the graph is total distance travelled by the body.
Acceleration means increase in speed which is the positive slope of the graph between t = 0 s and t = 4 s
Between t = 4 s and t = 6 s the velocity is constant and acceleration = 0 because the slope of the graph is zero.
Deceleration means decrease in speed. That is, the body is slowing down. This happened between t = 6 s and t = 9 s
Therefore, the object is moving at a constant velocity between time 4 s to 6 s
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