A student is walking in a straight line in front of a motion sensor. The student walks at a constant rate from a point 2 m from the motion sensor to a point 8 m from the sensor in 4 s. They then start to speed up, building up their speed until they are 20m from the sensor after 8 seconds. They then maintain that speed directly back to the sensor in 10s. Create a distance time graph for this situation (4 marks)