Do you mind me asking how the accident happened?
What kind of mound was it - sleeping policeman, pile of earth, unlit roadworks?
Re your inquiry, hitting as mound might suddenly force your car upwards, as opposed to a dead stop with your front end becoming a crumple zone - this might matter.
BTW were you injured - have you seen a doctor - because unless you have an injury that the air-bag could have prevented I don't see where your claim would arise anyway.
ONQ.