You don't have to solve it completely but give me some hints. Keep in mind I have almost no knowledge of physics at all, and please don't be surprised if the problem looks too simple to you. I have required level of math however.

>φ = 45°, ∠BAO = 90°, vA (velocity A) = 14m/s, AB = 70 cm. Find vB.

I don't really understand what vB is let alone how to find it. It means "velocity B" in some sense but I'm not sure which.