Got an impulse question here that I wouldn't normally struggle with, however there's something about a change of direction and not sure what to do here?

A ball of mass 0.1 kg hits a wall at 15 m/s and rebounds at a speed of 5 m/s.

If the path of the ball's diverted by radians by the impact, find the magnitude of the impulse exerted on the ball by the wall.

, so the magnitude of the impulse would be ?

Think that's right anyway. However I'm not sure how I'd solve it with the change of direction involved?

Thanks in advance