( Momentum ( ( is ( ( ( ( ( proportional ( to ( both mass ) ) ) ( -LRB- ( ( its ( harder ( to ( move ( a ( large mass ) ) ) ) ) ) -RRB- ) ) ) and ) velocity ) ( -LRB- ( ( its ( harder ( to ( deflect ( a ( fast ( moving object ) ) ) ) ) ) ) -RRB- ) ) ) ) . ) )
(ROOT (S (NP (NNP Momentum)) (VP (VBZ is) (ADJP (ADJP (JJ proportional) (PP (TO to) (NP (DT both) (NN mass)))) (PRN (-LRB- -LRB-) (S (NP (PRP$ its)) (ADJP (JJR harder) (S (VP (TO to) (VP (VB move) (NP (DT a) (JJ large) (NN mass))))))) (-RRB- -RRB-)) (CC and) (ADJP (JJ velocity)) (PRN (-LRB- -LRB-) (S (NP (PRP$ its)) (ADJP (JJR harder) (S (VP (TO to) (VP (VB deflect) (NP (DT a) (JJ fast) (VBG moving) (NN object))))))) (-RRB- -RRB-)))) (. .)))
Momentum is proportional to both mass (its harder to move a large mass) and velocity (its harder to deflect a fast moving object).
(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)))))) (. .)))