local play = game.Players.LocalPlayer
local userinput = game:GetService("UserInputService") 
local char = play.Character
local root = char:WaitForChild("HumanoidRootPart") 
local inair = false
local canjump = true
local hum = char:WaitForChild("Humanoid")


hum.StateChanged:connect(function(old,new)
 if new == Enum.HumanoidStateType.Freefall or new == Enum.HumanoidStateType.Jumping then
  inair = true
 else
  inair = false 
  canjump = true 
 end
end)


userinput.InputBegan:connect(function(input)
 if input.KeyCode == Enum.KeyCode.Space and inair == true and canjump == true then 
  root.Velocity =  Vector3.new(root.Velocity.X,hum.JumpPower,root.Velocity.Z)
  canjump = false 
 end 
end)