( Hence ( ( ( the unit ) ( of ( kinetic energy ) ) ) ( ( is ( ( ( joules , ) kilojoules ) etc. ) ) . ) ) )
(ROOT (S (ADVP (RB Hence)) (NP (NP (DT the) (NN unit)) (PP (IN of) (NP (JJ kinetic) (NN energy)))) (VP (VBZ is) (NP (NP (NP (NNS joules)) (, ,) (NP (NNS kilojoules))) (X (NN etc.)))) (. .)))
Hence the unit of kinetic energy is joules, kilojoules etc.
(ROOT (S (NP (NNS Kilojoules)) (VP (VBP are) (ADVP (RB typically)) (VP (VBN used) (S (VP (TO to) (VP (VB measure) (NP (NP (NNP heats)) (PP (IN of) (NP (NN reaction))))))))) (. .)))