To simulate a rope, the natural solution would be soft-body physics, which exists in Bullet but not in standard jMonkeyEngine. @Dokthar did some work in this area
- https://wiki.jmonkeyengine.org/jme3/advanced/softbody.html
- [devlog] Bullet SoftBody in JME3.1
- GitHub - dokthar/jmonkeyengine: A complete 3D game development suite written purely in Java.
and it’s on my to-do list for Minie.
For now, breaking the rope into small rigid-body segments (like a chain) is probably your best option.