Most muscles attach to at least two bones. One end of the muscle attaches to a bone that is immobile. The other end of the muscle is attached to a bone is mobile or moves. What is the end of the muscle to a mobile bone?

You throw a small rock straight up from the edge of a highway bridge that crosses a river. the rock passes you on its way down, 7.00 s after it was thrown. what is the speed of the rock just before it reaches the water 28.0 m below the point where the rock left your hand? ignore air resistance.