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In an experiment, a student launches a ball with an initial horizontal velocity at an elevation 2 meters above ground. The ball follows a parabolic trajectory until it hits the ground. Which of the following accurately describes the graph of the ball's vertical acceleration versus time (taking the downward direction to be negative)?
  1. A negative value that does not change with time
  2. A gradually increasing negative value (straight line)
  3. An increasing rate of negative values over time
  4. (parabolic curve)
  5. Zero at all times since the initial motion is horizontal
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OpenStax College Physics Solution, Chapter 3, Problem 2 (Test Prep for AP® Courses) (1:52)

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