( ( Calculate ( the ( elastic ( potential energy ) ) ) ) . )
(ROOT (S (VP (VB Calculate) (NP (DT the) (JJ elastic) (JJ potential) (NN energy))) (. .)))
Calculate the elastic potential energy.
(ROOT (S (NP (DT The) (ADJP (NN term) (JJ elastic)) (JJ potential) (NN energy)) (VP (VBZ is) (VP (VBN used) (S (VP (TO to) (VP (VB describe) (S (NP (JJ potential) (NN energy)) (ADJP (JJ due) (PP (TO to) (NP (NP (DT an) (NN object) (POS 's)) (NN shape)))))))))) (. .)))