How do I show path of projectile?

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Yeah, it’s the same but you will still need to tell the beam the shape of the projectile and where it’s going to which it will calculate using those 4 parameters.

Here is an example tool I took from an old topic I helped out a long time ago.

Create a tool in starter pack, and insert this as a local script 
local tool = script.Parent
tool.RequiresHandle = false

local Players = game:GetService("Players")
local player = Players.LocalPlayer
local mouse = player:GetMouse()

local DB = false

local function createBeamInProjectileMotionPath()
	local attach0 = Instance.new("Attachment")
	local attach1 = Instance.new("Attachment")

	local beam = Instance.new("Beam")
	beam.Color = ColorSequence.new(Color3.new(1, 0.035294, 0.035294))
	beam.Attachment0 = attach0
	beam.Attachment1 = attach1

	beam.Parent = workspace.Terrain
	attach1.Parent = workspace.Terrain
	attach0.Parent = workspace.Terrain

	return beam, attach0, attach1
end

local function beamProjectile(g, v0, x0, t1)
	-- calculate the bezier points
	local c = 0.5 * 0.5 * 0.5
	local p3 = 0.5 * g * t1 * t1 + v0 * t1 + x0
	local p2 = p3 - (g * t1 * t1 + v0 * t1) / 3
	local p1 = (c * g * t1 * t1 + 0.5 * v0 * t1 + x0 - c * (x0 + p3)) / (3 * c) - p2

	-- the curve sizes
	local curve0 = (p1 - x0).magnitude
	local curve1 = (p2 - p3).magnitude

	-- build the world CFrames for the attachments
	local b = (x0 - p3).unit
	local r1 = (p1 - x0).unit
	local u1 = r1:Cross(b).unit
	local r2 = (p2 - p3).unit
	local u2 = r2:Cross(b).unit
	b = u1:Cross(r1).unit

	local cf1 = CFrame.new(x0.x, x0.y, x0.z, r1.x, u1.x, b.x, r1.y, u1.y, b.y, r1.z, u1.z, b.z)

	local cf2 = CFrame.new(p3.x, p3.y, p3.z, r2.x, u2.x, b.x, r2.y, u2.y, b.y, r2.z, u2.z, b.z)

	return curve0, -curve1, cf1, cf2
end

local function createAndSetBeam(g, v0, x0, endTime, color)
	local t1 = endTime or 1 -- projectile time when in expires, or any number you want tbh
	local curve0, curve1, cf1, cf2 = beamProjectile(g, v0, x0, t1)
	local beam, attach0, attach1 = createBeamInProjectileMotionPath()
	beam.CurveSize0 = curve0
	beam.CurveSize1 = curve1
	beam.FaceCamera = true
	beam.Segments = 10 * math.round(t1 * 3)
	if color then
		beam.Color = ColorSequence.new(color)
	end
	-- convert world space CFrames to be relative to the attachment parent
	attach0.CFrame = attach0.Parent.CFrame:Inverse() * cf1
	attach1.CFrame = attach1.Parent.CFrame:Inverse() * cf2
	
	return beam, attach0, attach1
end


tool.Activated:Connect(function()
	local hrp = player.Character.HumanoidRootPart
	if not DB then
		local comet = Instance.new("Part")
		comet.Size = Vector3.new(2,2,2)
		comet.CanCollide = false
		comet.CFrame = hrp.CFrame
		comet.Parent = game.Workspace

		local antiGravity = Instance.new("BodyForce")
		local antiGravityFactor = 0.9--1 = gravity force counteracted, 0 = no force lol
		antiGravity.Force = comet:GetMass()*workspace.Gravity*antiGravityFactor *Vector3.new(0,1,0)
		antiGravity.Parent = comet
		local appliedVelocity = (CFrame.new(hrp.Position,mouse.Hit.Position).LookVector * 50)
		comet.AssemblyLinearVelocity = appliedVelocity
		
		local gravity = Vector3.new(0,-Workspace.Gravity*(1-antiGravityFactor),0)
		createAndSetBeam(gravity, appliedVelocity, hrp.CFrame.Position, 1)

		spawn(function()
			DB = false
			wait(5)
			comet:Destroy()
		end)
	end
end)

Also you will notice setting the end time as t1 = 1 will create a beam because thats where the projectile will be after one second with the beam will go towards and stop at that point, this is what happens if you set it to t1 = 30 from Ego Mooses beam formula.

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