An engineer needs to report the magnitude of acceleration of the train she is driving to her crew. the train started from rest at the station and accelerated uniformly for 180 seconds until it reached its maximum speed of 144 meters per second. what should the engineer tell the crew? a.the magnitude of acceleration was 0.22 m/s2 b.the magnitude of acceleration was 0.80 m/s2 c.the magnitude of acceleration was 4.5 m/s2 d.the magnitude of acceleration was 7.2 m/s2