I wrote a first solution of the quiz. This problem has a simple GUI. I first tried wxPerl but looks like the Wx::*DC classes are partially ported (to be confirmed in wxperl-users) so I switched to Perl/Tk.
Since it would be good to provide a movie of what the program is expected to do more or less, I upgraded Snapz Pro X, which is something I planned to do some day.
Now I'll double check with a coworker the elementary physics involved in the quiz.