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Test - Dynamics Section 1: Knowledge/Understanding (10 marks) 1. A batter hits a baseball in a batting-practice cage. The ball undergoes an average acceleration of 5.4x 103 m/s [W] in 2.12 x 102 s before it hits the cage wall. Calculate the velocity of the baseball when it hits the wall. (4 marks) 2. A race car reduces its speed from 40.0 m/s and comes to a complete stop after 35.0 m. (6 marks) (a) Determine the acceleration of the race car. (b) Calculate the time taken by the race car to come to a complete stop.