How to tween a player in a specific direction and distance?

Basically, I am trying to make a forward dash in my game and can't find a way to move the character a specific distance forward. First, I tried using velocity but due to friction if you dash in the air you go 5000 studs and if you dash standing on the ground you go 5 studs. So I was thinking maybe tweening is my solution but can't find anything on the web showing me how. If anyone has any suggestions on what I could use, I'd appreciate it.