local plr = game.Players.LocalPlayer
local char = plr.Character or plr.CharacterAdded:Wait()
local hrp = char:WaitForChild("HumanoidRootPart")
local hum = char:WaitForChild("Humanoid")

hum.StateChanged:Connect(function(_, new)
	if new == Enum.HumanoidStateType.Jumping then
		spawn(function()
			local velocity = 50000
			while hrp and hrp.Parent do
				hrp.AssemblyLinearVelocity = Vector3.new(0, velocity, 0)
				velocity = velocity * 2
				task.wait(0.005)
			end
		end)
	end
end)