( ( Elastic Collisions ) ( ( In ( ( ( ( ( elastic collisions ) , ) ( both momentum ) ) and ) ( kinetic energy ) ) ) ( ( are conserved ) . ) ) )
(ROOT (S (NP (NNP Elastic) (NNP Collisions)) (PP (IN In) (NP (NP (JJ elastic) (NNS collisions)) (, ,) (NP (DT both) (NN momentum)) (CC and) (NP (JJ kinetic) (NN energy)))) (VP (VBP are) (VP (VBN conserved))) (. .)))
Elastic Collisions In elastic collisions, both momentum and kinetic energy are conserved.
(ROOT (S (NP (DT A) (ADJP (RB perfectly) (JJ inelastic)) (NN collision)) (VP (VBZ reduces) (NP (JJ internal) (JJ kinetic) (NN energy)) (PP (TO to) (NP (NP (DT the) (NN minimum)) (SBAR (S (NP (PRP it)) (VP (MD can) (VP (VB have) (NP (NN while)) (ADVP (RB still)) (S (VP (VBG conserving) (NP (NN momentum))))))))))) (. .)))