[Mllab] exercise sheet 5

Dear Prof. Garcke, I have attached the solution to exercise sheet 5 of our group (D, Valerio and Marco). We had some troubles with the first tasks and we got to task 4 only today when we found out we were not able to install the required packages (we would always get the messages: 'Failed building wheel for box2d' and 'Failed building wheel for box2d-kengz'). We filled up the necesary code but we not able to check if it was running properly. Best regards, Valerio Cini