Long description: Fig9P
Alt text: The diagram shows the trajectory of a projectile, illustrating that it reaches a given height at two different horizontal distances.
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- A parabolic curve represents the path of a projectile launched over a horizontal surface.
- The vertical dimension labeled \(H\) indicates the maximum height achieved by the projectile.
- A vertical dashed line marks the horizontal position corresponding to the height \(H\) at an initial range \(X_1\).
- A second vertical dashed line marks the horizontal position corresponding to the same height \(H\) at a final range \(X_2\), showing symmetry around the peak of the trajectory.