A ball is thrown from the top of a hill. The graph shows the relationship between the height h, in meters, of the ball above the ground at the base of the hill and the time t, in seconds, after the ball is thrown. The function h (t) = - 4.9t2 + 9.8t + 15 models h as a function of t. What is the significance of the vertex of the parabola in terms of height and/or time?
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