the velocity of a train is 80.0 km/h, due west. one and a half hours later its velocity is 65.0 km/h, due west. what is the train's average acceleration? (a) 10.0 km/h2, due west (b) 43.3 km/h2, due west (c) 10.0 km/h2, due east (d) 43.3 km/h2, due east (e) 53.3 km/h2, due east.