3 The diagram shows a velocity-time graph for a train as it moves on a straight horizontal track for 50 seconds.
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- Find the distance that the train moves in the first 28 seconds.
- Calculate the total distance moved by the train during the 50 seconds.
- Hence calculate the average speed of the train.
- Find the displacement of the train from its initial position when it has been moving for 50 seconds.
- Hence calculate the average velocity of the train.
- Find the acceleration of the train in the first 18 seconds of its motion.