About: http://webisa.webdatacommons.org/372114277

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Maybe, because X is an int, velocity is a float, and delta time is a int, maybe it is rounding up (round towards zero)? that could explain why, if his velocity is high enough, it continues to move left.
http://www.w3.org/ns/prov#wasQuotedFrom	gamedev.net