@author Rafael G. de Pontes
Notes:
- Distance is measured in pixels
- Time is in seconds
There are 3 bodies, with initial velocity = 1 pixel/second towards the right (+x axis):
- Constant velocity of 1 pixel/second
- Increased by 1.0 pixel/physics_frame (every _physics_process call)
- Increased by 1.0 * delta pixel/physics_frame (every _physics_process call)
Conclusion: if you want to properly accelerate a KinematicBody2D, you have to multiply acceleration by delta every _physics_process call before adding to the KB2D velocity.