Now let’s consider relative motion in two dimensions when gravity is involved.

How does motion look to a stationary observer if somebody drops an object from a moving vehicle or throws an object upward from a moving vehicle?

Source: By USAF, Wikimedia Commons

Air resistance is ignored as a factor in the following examples from the Physics Classroom.

Now let’s take a look at two scenarios illustrating air resistance.

Where will a package dropped from an airplane land?

The Plane and the Package

Where will a ball land when thrown straight up from the bed of the moving truck?

The Truck and the Ball