A bridge rises 321m above the Arkansas river. Suppose you kick a rock horizontally off the bridge. The magnitude of the rock's horizontal displacement is 45.0 m. Fine the speed at which the rock was kicked. (This is not what i ask you here) Does the ball travel 321m vertically in free fall? If so, then i have a question, we know that 321m is a vertical path straight down to the river, which is perpendicular. but when we draw the path of the ball that travels is half of a parabola, which is a curve, so if we have the common sense we know that if we measure the distances of these two paths, they are different. THe curve is longer than the straight line. so i don't know if it travels 321m vertically in free fall. Hope you can explain it to me, thank you.