timer1 = Timer()

function SpawnTank(args)
    if args.text == "/drop" then
        Vehicle.Create(18, ((args.player:GetPosition().z) + 1000), Angle(0, 0, 0))
        if timer1:GetMilliseconds() < 2000
            Vehicle:SetLinearVelocity(0, 0, 10)
            timer1:Restart()
        end
        return false
    end
    return true
end

Events:Subscribe("SpawnTank", PlayerChat)