How to make slime block launchpad on minecraft pc-updated

first, dig down cross shape and 2 blocks deep

place sticky piston at middle and put redstone dust on side

put slime block on piston and place furnace instead of obsidiens to cover holes on side

now, place pressure plate on side, where you placed redstone under it.

if you walk between pressure plate and slime block, you will be able to jump higher!