Long description: Fig19P

Alt text: The image shows a sketch comparing an inclined plane with a curved trajectory in a plane.

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On the left, a diagram labeled "Inclined Plane" depicts a line at an angle, with the angle of inclination labeled as \(\alpha\).
On the right, a diagram labeled "Plan View" illustrates a curved trajectory connecting two points, representing a projectile's path in a horizontal plane.
This curved path is shown starting from a point where the initial angle is labeled as \(\theta\) and associated with a displacement vector labeled \(u\).
The path ends at a point further along the horizontal axis, indicating a final position labeled \(i\) and a final vertical position labeled \(j\).
A horizontal distance labeled \(d\) is drawn beneath the curved path, representing the horizontal separation between the start and end points.