Among the given options, which graph or graphs represent the velocity-time relationship of a ball during its upward flight when thrown vertically (assuming no air resistance)?
During the upward motion of the ball, represented by the positive region on the graph, the velocity decreases linearly. In contrast, during the downward motion of the ball, represented by the negative region on the graph, the velocity increases linearly. It is important to note that the direction of velocity during the upward motion is opposite to that during the downward motion. Thus, the downward motion is depicted in the negative region of the graph.
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