About: http://webisa.webdatacommons.org/9633177

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	Both A and B are at rest before firing, $m_A=m_B$, and the system including both masses, system AB, has a CM at $d/2$.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com