I wanted to use jump and speed pads to create an elytra launcher. Unfortunately, touching a jump pads removes momentum from the player before shooting them in the air. If momentum was preserved, bounce pads could be used to make some fun contraptions.

In the below screenshot, I landed 6 blocks away whether I had a running start or not.

Just tested it myself. It doesn't cancel horizontal momentum. Speed pads just aren't that fast. I'd add higher tiers of speed pads if I knew how to fix the bug where you gain really high speed when jumping over speed pads.