The _physics_process function is a special function in the Godot engine that is called once per frame, with a delta value indicating the time passed since the last call. It's purpose is to handle the physics calculations for an object in the scene.

In this specific code block, it first checks if the jumping variable is true. If so, it calculates the new velocity of the object based on the gravity value multiplied by the delta value. This is to simulate the effect of gravity on the object.

Then, it checks if the new y component of the velocity is less than 0. If so, it sets jumping to false, which could indicate that the object has landed on the ground after jumping.
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