a test in using simple balistics as an example for teaching about methods, maths, physics, mecanics, spreadsheets, python (and for myself latex, jupyter, matplotlib, etc.)
To view the jupyter notebook html render in the nbviewer go to [https://nbviewer.jupyter.org/github/hern42/balistics/blob/master/JupyterNotebook-Balistique/STI2D%20balistics.ipynb]