Hello. I want to build a small zip line. Basically it is a steel cable anchored in two points with a different height in each anchor. Then you travel along the cable from the highest anchor to the lowest with the help of a pulley to reduce friction. I found that the cable form a Catenary curve, there are ways to figure the maximum force at each of the anchors, but could not find out how to find the speed at each point of the cable. Basically the cable’s angle should work the speed, but also the cable tension should influence the speed. Do you know how can this speed be calculated or estimated, assuming frictionless displacements, etc? Tanks very much. Regards; Fernando.