How would I go about making a boost part?

I am making a racing game and I am working on making a part the will boost the player. I want it so when the player touches it, it will launch them in the direction the Part is facing. I am NOT asking for a script! I just am having difficulties and am reliability new with CFrame. I think I will have to do something with the look vector of the part. Also would I use the velocity of the HumanoidRootPart or insert a BodyThrust or something. Here is a script that I was just testing with.

script.Parent.Touched:connect(function(hit)
	if hit.Parent:FindFirstChild('Humanoid') then
		local thrust = Instance.new("BodyVelocity")
		thrust.Parent = hit.Parent.HumanoidRootPart
		thrust.Velocity = Vector3.new(-50,0,0)
		wait(2)
		thrust:Destroy()
	end
end)

It only sends them one direction as you can see. As I send I have a feeling I need to use Look Vector but idk how to use it. The reason I want it to launch them the way the part is facing is so I don't have to change the direction for all the boosters. Thanks!