( ( Momentum ( in physics ) ) ( ( is ( mass ( multiplied ( by ( the velocity ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Momentum)) (PP (IN in) (NP (NN physics)))) (VP (VBZ is) (NP (NP (NN mass)) (VP (VBN multiplied) (PP (IN by) (NP (DT the) (NN velocity)))))) (. .)))
Momentum in physics is mass multiplied by the velocity.
(ROOT (S (NP (NNP Momentum)) (VP (MD can) (VP (VB be) (VP (VBN calculated) (PP (IN by) (S (VP (VBG multiplying) (NP (NP (NP (DT an) (NN object) (POS 's)) (NN mass)) (PP (IN in) (NP (NP (NNS kilograms)) (PRN (-LRB- -LRB-) (NP (NN kg)) (-RRB- -RRB-))))) (PP (IN by) (NP (NP (PRP$ its) (NN velocity)) (PP (IN in) (NP (NP (NNS meters)) (PP (IN per) (NP (NP (JJ second)) (PRN (-LRB- -LRB-) (NP (NN m/s)) (-RRB- -RRB-)))))))))))))) (. .)))