Left panel: the momentum boost for the known molecular and atomic outflows of Mrk 231. References are Aalto et al. (2015) for HCN, Gonzalez-Alfonso et al. (2014) for OH, Rupke & Veilleux (2011) for NaID, this work for CO. Right panel: the ratio of versus velocity of the outflows of Mrk 231 (diamond: this work, stars: other works, see references above). Filled squares show the measurements for IRAS F11119+3257 (Tombesi et al. 2015). Red and black solid lines are the expectations for energy conserving outflows, , with v_wind = v_UFO ± 1σ for Mrk 231 and IRAS F11119+3257, respectively.