Answers:
You can use either, just be consistent.
In other words, don't say, "We went forward and backwards," or "we went forwards and backward". Instead, say "forwards and backwards" or "forward and backward". Consistency, man.
i think its "s" for singular and no "s" for plural
eg
singular: He went backwards to retrace his steps.
plural: we went backward in time when we visited the museum.
They r the same.I think that one is British English and the other one is American English.
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