Please do not start to argue about the senses of this proposal, ask "why" to understand it.

It came to my mind that all these little gadget apps is what users attract. If useless or not maybe they are just fun for someone, maybe they are handy for someone or just another button on the desktop...

For me it isnt handy, for me a spreadsheat tool like origin would be handy. Matrix calculations, Fourier-Transformations and so on... but for the others stuff like Physics is a closed book of secrets.

Now to the app, a simple solution was presented python with desktop widget, easy going.
My idea goes a bit more in the professional direction. A graphical UI where you are able to manipulate: direction of shot, angle of shot, starting speed of bullet, wind and its direction, level of shooter. This tool should include realistic ballistics with air resistance. What you see: A tiny person on the screen, 3 rotational arrays, one to manipulate the direction of the shot, one for wind and one for shooting angle. Textboxes for level position, bullet and wind speeds.

This is not thought to an end so please pick it up and propose a solution.