How do i make this gun actually do damage!?

So i made a gun that shoots bananas but i want them to do damage when they hit a player. I have already tried just making a simple damage script in the banana its self but it doesnt work? Any ideas?

local ReplicatedStorage = game:GetService("ReplicatedStorage")
local banana1 = ReplicatedStorage.banana
local player = game.Players.LocalPlayer
local mouse = player:GetMouse()
local Damage = 10
script.Parent.Activated:Connect(function()
	local banana = banana1:Clone()
	banana.CFrame = script.Parent.Handle.CFrame

	local cow = Instance.new("BodyVelocity",banana)
	cow.P = Vector3.new(100,100,100)
	cow.Velocity = mouse.Hit.LookVector * 100
	banana.Parent = game.Workspace
	wait(2)
	game.Workspace.banana:Destroy()
end)

wasnt solved gave up on this website

Try to use touched events. This is how I would approach it (with remote events of course).

Local script (yours, currently).

local ReplicatedStorage = game:GetService("ReplicatedStorage")
local banana1 = ReplicatedStorage.banana
local player = game.Players.LocalPlayer
local mouse = player:GetMouse()
local Damage = 10

local RemoteEvent = ReplicatedStorage.RemoteEvent -- Please make a remote event in replicated storage.
script.Parent.Activated:Connect(function()
	RemoteEvent:FireServer(banana, Damage)
end)

Server script -- Put it wherever you want.

local RemoteEvent = game.ReplicatedStorage.RemoteEvent

RemoteEvent.OnServerEvent:Connect(function(banana, Damage)
	local banana = banana1:Clone()
	banana.CFrame = script.Parent.Handle.CFrame

	local cow = Instance.new('BodyVelocity', banana)
	cow.P = Vector3.new(100, 100, 100)
	cow.Velocity = mouse.Hit.LookVector * 100
	banana.Parent = workspace

	banana.Touched:Connect(function(part) -- Touched event to do damage
		local humanoid = part.Parent:FindFirstChild('Humanoid') -- Try to detect humanoid, returns nil if no humanoid is found.
		if humanoid then -- Check to see if a valid humanoid is present
			humanoid:TakeDamage(Damage)
			-- Alternative: humanoid.Health -= Damage
			-- ^^ Is the equivalent of humanoid.Health = humanoid.Health - Damage. Please use the comment above for cleaner code.
		end
	end)
end)

If you don't know what RemoteEvents are, read this documentation.

Hope this helps. Cheers!