This file shows a Pasco howitzer cart shooting a projectile vertically upward (perpendicular to the level track) while moving horizontally. It can be used to demonstrate the independence of the vertical and horizontal components of projectile motion if air resistance can be neglected.

The same howitzer cart, still adjusted to shoot the projectile perpendicular to the track, is now on a tilted track. It coasts uphill as the howitzer is fired and the projectile lands. Where does the projectile land: To the left of the howtizer (behind it), in the howitzer barrel, or to the right of the howitzer?

The same howitzer cart, still adjusted to shoot the projectile perpendicular to the tilted track, is now pushed more gently. It coasts uphill as the howitzer is fired, but changes direction and coasts downhill as the projectile lands. Where does the projectile land now: To the left of the howtizer, in the howitzer barrel, or to the right of the howitzer?