"make a grappling hook with physics the tool is called grap make the rope visible"

-- local script inside the Grap tool 
local tool = script.Parent
local player = game.Players.LocalPlayer
local mouse = player:GetMouse()
local rope = Instance.new("RopeConstraint")
local isFired = false

local function createRope(target)
    rope.Parent = game.Workspace
    rope.Attachment0 = tool.Handle.Attachment0
    rope.Attachment1 = target
    rope.Visible = true
    rope.Length = (tool.Handle.Position - target.Position).Magnitude
end

local function fire()
    if not isFired then
        isFired = true
        local ray = Ray.new(tool.Handle.Position, mouse.Hit.p - tool.Handle.Position)
        local part, position = game.Workspace:FindPartOnRay(ray, player.Character, false, true)

if part then
            local attachment = Instance.new("Attachment", part)
            attachment.Position = part.CFrame:ToObjectSpace(CFrame.new(position)).p
            createRope(attachment)
        end
    end
end

local function release()
    if isFired then
        isFired = false
        rope.Parent = nil
        if rope.Attachment1 then
            rope.Attachment1:Destroy()
        end
    end
end

tool.Activated:Connect(fire)
tool.Deactivated:Connect(release)