Let's introduce the effects of gravity.
Sounds really complicated, but it's surprisingly easy in code.
Gravity is an acceleration in the downward direction.
In the same way velocity is the rate of change of position, acceleration is the rate of change of velocity.
Think of this: when the position (x and y) is constant, the object doesn't move.
When the position changes at a constant rate (changes by the amount of velocity), the object moves steadily.
When the velocity also changes at a steady rate, the object accelerates.
In the first example, the velocity is 10 and there is zero acceleration. In the second example, the velocity starts at 10 and the acceleration is 5. The velocity ends up at 25.
Sounds really complicated, but it's surprisingly easy in code.
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