( ( Collisions ( between molecules ) ) ( ( ( are elastic ) ( -LRB- ( ( ( kinetic energy ) ( is conserved ) ) -RRB- ) ) ) ; ) )
(ROOT (S (NP (NP (NNS Collisions)) (PP (IN between) (NP (NNS molecules)))) (VP (VP (VBP are) (ADJP (JJ elastic))) (PRN (-LRB- -LRB-) (S (NP (JJ kinetic) (NN energy)) (VP (VBZ is) (VP (VBN conserved)))) (-RRB- -RRB-))) (: ;)))
Collisions between molecules are elastic (kinetic energy is conserved);
(ROOT (S (SBAR (IN Because) (S (NP (NNS collisions)) (VP (VBP are) (ADJP (JJ elastic))))) (, ,) (NP (NN energy)) (VP (MD can) (VP (VB be) (VP (VBN transferred) (PP (IN between) (NP (NNS molecules))) (PP (IN during) (NP (PRP them))))))))