All objects are Physics2.0
The motion trajectory is plotted while aiming (drag and pull the mouse on the ball). But the motion is different mostly than the path.
I haven’t had time to dig in and fix it properly, but it seems you have 0 degrees as pointing up from the object, while GDevelop uses 0 degrees as pointing to the right right (and 270 pointing up). See here for explanation of it.
Also, it is cool that you can include everything in a single .json when your graphics are sourced from the web
I solved your problem. Change the way you apply your force to:
Apply to Test a force of Length -DistanceBetweenPositions(PlayerX.(), Player.Y(), Mouse.X(), Mouse.Y()) / 2.5 towards Mouse.X(), Mouse.Y()
It’s works like a charm to me.