( ( Distinguish ( between ( ( ( ( ( ( ( speed , ) velocity ) , ) ( instantaneous velocity ) ) , ) and ) ( average velocity ) ) ) ) ; )
(ROOT (S (VP (VB Distinguish) (PP (IN between) (NP (NP (NN speed)) (, ,) (NP (NN velocity)) (, ,) (NP (JJ instantaneous) (NN velocity)) (, ,) (CC and) (NP (JJ average) (NN velocity))))) (: ;)))
Distinguish between  speed, velocity, instantaneous velocity, and average velocity;
(ROOT (S (NP (JJ Instantaneous) (NN velocity)) (VP (VBZ is) (VP (VBN defined) (PP (IN as) (NP (NP (DT the) (NN velocity)) (PP (IN of) (NP (DT the) (NN object))))) (PP (IN at) (NP (DT a) (VBN given) (NN moment))))) (. .)))