( ( ( ( Relativistic velocity ) , ) ( ( ( ( momentum and ) mass ) . ) 2 ) ) . )
(ROOT (NP (NP (JJ Relativistic) (NN velocity)) (, ,) (NP (NP (NP (NN momentum)) (CC and) (NP (NN mass)) (. .)) (NP (CD 2))) (. .)))
Relativistic velocity, momentum and mass. 2.
(ROOT (S (NP (NNP Momentum)) (VP (VBZ is) (ADJP (RB directly) (VBN related) (PP (TO to) (NP (NP (DT both) (NN mass)) (CC and) (NP (NN velocity)))))) (. .)))