Been making a mario run styled game and trying to make a mechanic where if the play is on this platform they slow down and can hit jump to gain extra height but I can’t seem to figure how to do it

Been making a mario run styled game and trying to make a mechanic where if the play is on this platform they slow down and can hit jump to gain extra height but I can’t seem to figure how to do it

Thanks for the heads up didn’t know that and i’ve tried messing with values but nothing seems to work. the player would slow down but I can’t have him launch at the specific height or angle I want, pretty much just a bounce pad that the player has to time a key press to