Why doesn't this simple Velocity script work?

Hello! So yeah, I've encountered another script in which I have absolutely no idea how it won't work. It is so simple but does nothing. Nothing in the output either... So basically this script makes it so every 2 seconds the Part will fly up with 20 velocity. It is rotated on its side. so that's why it is (20,0,0) and not (0,20,0)

Head = script.Parent

while true do wait()
    wait(2)
    Head.Velocity = Vector3.new(20,0,0)
end

It's so simple but I don't get whats wrong... Any help?