No matter how long the slinky is, the bottom of the slinky will stay still (hover) until the top reaches it. Even if the slinky is over 1000 feet long.
I refuse to believe this
it’s probably because the force pulling the slinky back together is equal on both ends. so the force is coming from two directions, top and bottom. without gravity, the middle of the slinky would be the part that wasn’t moving—both ends of the slinky are pulling inwards with equal force. but with the third force, gravity, working to pull the entire slinky down, the upward force of the slinky pulling itself together and the downward pull of gravity cancel each other out.