Su Bingtian, Asia's fastest man, is running along a straight line. Assume that he starts from rest from point A and accelerates uniformly for 7 s, before reaching a speed of 3 m/s. He is able to maintain this speed for 5 s. After that, it takes him 6 s to decelerate uniformly to come to a stop at point B. Sketch a speed versus time graph based on the information given above. Find the value of 7 if the distance between A and B is 100 m. Hii. Determine the deceleration. (7 marks)