Train a is moving 40m/s east. train b is moving 30m/s east. train a is gaining on train b and engineer a would like to avoid a collision with train b, if possible. assume the front of train a is 110m from the rear of train b, when engineer a reacts to the imminent collision. after reacting, engineer a applies train a’s brakes and decelerates at 0.5m/s2.