Why does my ball have no physics

[wizzjordan2 (Buccxs)]

so ive been using kinematic formula for simulating my ball movment but for some reason when its done my ball has no physics to it and i just need help with it thx in advance

(https://gyazo.com/e0af3cb33647f07a401cef205c5c9917)

local ReplicatedStorage = game:GetService("ReplicatedStorage")
local RunService = game:GetService("RunService")

local clientEffects = ReplicatedStorage.Remotes

local Shoot = {}

function Shoot.new(Gravity, WhiteList, Wind, Despawntime, MaxBounces, Decay, Threshold, Visulize)
	local newKick = {}

	newKick.Gravity = Gravity or 9.8
	newKick.Wind = Wind or Vector3.new(0,0,0)
	newKick.Threshold = Threshold or 0.1
	newKick.MaxBounces = MaxBounces or 3
	newKick.Decay = Decay or 0.8
	newKick.Despawntime = Despawntime or 3
	newKick.Visulize = Visulize or false
	newKick.Params = RaycastParams.new()

	newKick.Params.FilterType = Enum.RaycastFilterType.Include
	newKick.Params.FilterDescendantsInstances = WhiteList

	function newKick:Cast(Start, dest, vel)
		local conversion = 192.2 / 9.8
		local velocity = (dest - Start).Unit * vel * conversion

		local a = Vector3.new(newKick.Wind.X, newKick.Wind.Y - newKick.Gravity * 9.8, newKick.Wind.Z) * conversion

		local t = 0
		local totalTime = 0
		local bounces = 0
		local currentVelocity = velocity
		local currentPos = Start
		local rayResult = nil
		local found = false

		local index = tick()
		clientEffects.BallShoot:FireAllClients(index)

		local Connection
		Connection = RunService.Heartbeat:Connect(function(dt)
			if found then
				Connection:Disconnect()
				return
			end

			t += dt
			totalTime += dt

			currentVelocity = velocity + a * t
			local projPos = Start + velocity * t + 0.5 * a * t * t

			rayResult = workspace:Raycast(currentPos, projPos - currentPos, newKick.Params)

			clientEffects.BallUpdate:FireAllClients(index, currentPos, projPos)
			currentPos = projPos

			if self.Visulize then
				local part = Instance.new("Part")
				part.Size = Vector3.new(0.5, 0.5, 0.5)
				part.Position = projPos
				part.Anchored = true
				part.CanCollide = false
				part.Material = Enum.Material.Neon
				part.Color = Color3.fromRGB(255, 0, 4)
				part.Shape = Enum.PartType.Ball
				part.Parent = workspace
				Debris:AddItem(part, 0.5)
			end

			if rayResult then
				bounces += 1
				t = 0

				if bounces < newKick.MaxBounces then
					velocity = 0.9 * (currentVelocity - 2*currentVelocity:Dot(rayResult.Normal) * rayResult.Normal)


					if velocity.Magnitude < self.Threshold then
						velocity = velocity * 0.8 -- Reduce speed gradually instead of stopping
						if velocity.Magnitude < 0.5 then -- If it's too slow, THEN stop it
							found = true
						end
					end


					Start = rayResult.Position
					currentPos = rayResult.Position
					 
				else
					print("Current Velocity:", velocity.Magnitude)
					found = true
				end
			end

			if totalTime > self.Despawntime then
				found = true
				 
			end
			if found then
				local currentBall = workspace:FindFirstChild("Ball")
				print(workspace.Ball.Anchored) -- Should print false
                 local weld = currentBall:FindFirstChildOfClass("WeldConstraint")
if weld then
    weld.Enabled = false -- Disable it for movement
end
				if currentBall then
					print("Ball handing control to physics")
					currentBall.AssemblyLinearVelocity = velocity -- Keeps rolling
					currentBall.AssemblyAngularVelocity = Vector3.new(0, 3, 0) -- Adds spin
				end
			end

		end)
	end

	return newKick
end

return Shoot```

[robot300047 (hello)]

This might be happening because you are disconnecting the function when the velocity is less that 0.5; it also could be one of your variables.