The position-time graph of an object moving with a constant average velocity is always a straight line

Answer and explanation:

The statement in question is correct, the position-time graph of an object with a constant average velocity is always a straight line. This is because if the velocity is constant, the position will change by the same amount consistently. This is what causes the line in the graph to be straight.

The objects do not reach terminal velocity         there is not enough time from the time the object falls from when it hits the ground to achieve terminal velocity. an object must be placed higher to achieve terminal velocity in order to be in free fall.