Kirby spies a piece of cake sitting on a ledge overhead. Naturally, he begins to fly straight upwards towards it, flying at a constant speed of 5m/s.

His friend Waddle-Dee stands 10m away from where Kirby took off on the ground. At what rate is the angle of elevation from Waddle-Dee to Kirby increasing 2 seconds after Kirby begins his pursuit? (Waddle-Dee is very short, so you can take this angle to be from the ground.)