How would I find the speed of a moving part?

This is a script I made that if the part touches something and its X velocity is higher than 20 it prints "touched" but I realized that the numbers would go into the negatives. How would I find the speed of the part without it going into the negatives?

local vel = script.Parent.Parent.Parent.Parent.Part.Velocity.X
local minvel = 20
script.Parent.Touched:Connect(function()
	if not debounce then
		if vel > minvel then
			debounce = true
			print("touched")
			wait(0.5)
			debounce = false

		end
	end
end)

In order to make the velocity positive, you can use the math.abs() in the math library.

local vel = script.Parent.Parent.Parent.Parent.Part.Velocity.X
local minvel = 20
script.Parent.Touched:Connect(function()
    if not debounce then
        if math.abs(vel) > minvel then --It will become an absolute value.
            debounce = true
            print("touched")
            wait(0.5)
            debounce = false

        end
    end
end)