Count the collisions! - Colegiul National Mihail Eminescu (Satu Mare - Roumanie) Lycée Bellevue (Alès), Lycée Jean-Baptiste Dumas (Alès)

Établissement
Colegiul National Mihail Eminescu (Satu Mare - Roumanie)
Année
2017-2018
Résumé
A very small ball collides against two walls forming an angle u. How many collisions will occur? Calculate the time needed for the ball to escape outside the angle of walls.
Sujet complet