So I saw a video of a falling slinky in slow motion where a slinky is held at the top and is let to be stretched by gravity until gravity and spring pulling force equal out, when the top is let free, the bottom stays still until the top actually falls down reaching the bottom and discharging its tension and only then the bottom (with the top) start to fall down .. Pretty interesting stuff. I have a few questions about this. *When the top part finally reaches the bottom part, does it accelerate the bottom part, apart from gravity, with the kinetic energy it gained when the spring collapses? On that note - does upper part fall down with just the acceleration of gravity or gravity + spring pulling?