How can i reverse upVector on this script?

i am trying to make this go other way not just right... inverse does not work it just applies power and clones the body-velocity and the - does not work as well :/

D = Instance.new("BodyVelocity")
            D.Parent = player.Character["Torso"]
                D.velocity = player.Character["Right Arm"].CFrame.upVector * 40 
                D.MaxForce = MaxForce   
                Debris:AddItem(D,0.3)