local sqrt = math.sqrt

velocitySystem = filteredSystem({ position = T.XyPair, velocity = T.XyPair }, function(e, dt, system)
    if not e.velocity then
        return
    end
    if sqrt((e.velocity.x * e.velocity.x) + (e.velocity.y * e.velocity.y)) < 1.5 then
        e.velocity = nil
        if e.spawnEntitiesWhenStopped then
            e:spawnEntitiesWhenStopped(system.world)
            e.spawnEntitiesWhenStopped = nil
        end
        system.world:addEntity(e)
    else
        e.position.x = e.position.x + (e.velocity.x * dt)
        e.position.y = e.position.y + (e.velocity.y * dt)
    end
end)