Bouncing an ellipse with gravity, velocity, and reflection within another ellipse

After seeing this a bunch of times on social media I decided to try and code my own to limited success.

https://www.tiktok.com/@jacksphysics/video/7305867733889977633

Every time I start to unpack the problem I realise that there are a bunch of subtle issues to solve that are actually much harder than they look. Perhaps you could give us some clue as to the underlying physics.

Start by reviewing the linked TikTok and the issue's description to identify the intended ellipse-bouncing behavior and physics requirements. Define the scope and success criteria before implementation, since the issue does not name project files, tests, or an existing entry point.

Vom Indexierungsmodell aus dem Issue-Text verfasst.