moving platform

--time it takes to move from start to finish
local MoveTime = 2
--time to wait before going again, set to zero to always move
local WaitTime = math.random(0, 100) / 100
--how far to go in each direction, x y and z. (0, 0, 0) means stay still
local moveDirection = Vector3.new(0, 0, 0)

local TweenService = game:GetService("TweenService") --tween service
local RunService = game:GetService("RunService") --run service

local part = script.Parent --set up parent

local info = TweenInfo.new(
	MoveTime, -- how long the tween will take
	Enum.EasingStyle.Linear, -- How the tween will play
	Enum.EasingDirection.Out, -- which way itll go
	-1, -- how many times itll repeat
	true, -- if you want it to repeat
	WaitTime -- delay time
)

local goal = {Position = Vector3.new(part.Position.X, part.Position.Y, part.Position.Z) + moveDirection}

local tweening = TweenService:Create(part, info, goal)

tweening:Play()

local lastPosition = part.Position
RunService.Stepped:Connect(function (_, deltaTime)
	local currentPosition = part.Position
	local deltaPosition = currentPosition - lastPosition
	
	local velocity = deltaPosition / deltaTime
	
	part.AssemblyLinearVelocity = velocity
	
	lastPosition = currentPosition
end)