I'm sorry, I wrote the question poorly, the platform is a "soft" platform, it really makes the ball rebounds less. But I still don't know if the way I calculated the coefficient is the correct way. Can I divide the two rebound speeds to find it?
Rebound speeds:
Without the platform...
1. A ball is launched against a solid wall with straight trajectory and a velocity of Vo. It hits the wall on a 3ft height and it falls on the ground at a 2ft distance (by the left of the wall). Then, an elastic platform is positioned on the exact height of the collision of the ball, and it is...