Analysing some possible trajectories for a cat stopped over a sliding stair (think about the particular cases and try them with the applet bellow).

This activity is linked with a Kahoot quizz, that you can get in [url=https://play.kahoot.it/#/k/85da17b4-936b-4a51-bbff-26a5b18fa60f]https://play.kahoot.it/#/k/85da17b4-936b-4a51-bbff-26a5b18fa60f[/url].[br][br]You can see a deep approach for this problem in [br][url=http://clubes.obmep.org.br/blog/problemao-a-volta-do-gatinho/]http://clubes.obmep.org.br/blog/problemao-a-volta-do-gatinho/[/url] (in portuguese).[br]