Physics, 14.06.2020 02:57 Lockdown

Which equation best represents the horizontal momentum in this situation?
15v;+ 2v;= 15V; + 20+
15v;+ 2(0) = 15V+ 20+
15v; + 2(0) = (15 + 2)V+
15v; + 2v;= (15 + 2)V+

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Which equation best represents the horizontal momentum in this situation?
15v;+ 2v;= 15V; + 2...