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Question 3 When a football (soccer) player takes a penalty kick, the impact causes the ball to travel at a constant speed of 30 m/s in a straight line. The contact time between the foot and the ball is 0.1 s. The ball travels for 0.3 s before it is blocked by the goalkeeper. The contact time between the goalkeeper's hand and the ball is 0.1 s, and the ball ends up travelling back towards the penalty kicker at a speed of 10 m/s (along the original path but opposite direction). a) Determine the averaged magnitude of the ball's acceleration at the instant it is kicked by the player; (15 marks) b) Determine the averaged magnitude of ball's acceleration at the instant it is blocked by the goalkeeper. (15 marks)