The motion of the person on a velocity time graph would show a flat portion which indicates that there is no change in the speed.
If the person moves at constant velocity, it implies that the velocity is not changing with time. This implies that the person does not change speed and that the acceleration of the person is zero.
Accordingly, the motion of the person on a velocity time graph would show a flat portion which indicates that there is no change in the speed of the object with time as the person moves.
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