An train car of total mass of 13000 kg is pulling into a station and slowing down with an acceleration of -4.56 m/s^2. before the train pulls into the station, a group of 7 stowaway jump off the train. each stowaway has a mass of 66 kg. if the braking force on the train remains the same, what will be the acceleration of the train once the stowaways jump out of the train?