Posted by John on Tuesday, February 19, 2013 at 7:37am.
the problem with language is it imprecise. That is why the French Academy in the 1700's went to symbols.
R = √(u^2+v^2)/m
so, just plug in the numbers:
3 = √(u^2+6^2)/5
15 = √(u^2+36)
Now square both sides to get
u^2+36 = 225
u^2 = 189
u = ±√189 = ±3√21
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