On an icy day, a police officer was using his radar gun to catch speeding cars when he witnessed a rear-end collision. The officer drew a diagram of the accident in his police report and a reproduction of it is shown below. In the diagram, each car is represented by a box with the appropriate letter labeled and Car C represents the police officer. There is also some data that has been collected by a team of lawyers hired by the driver of car A. The driver of car A claims that he was not speeding at the time of the collision. Based on the evidence, write a scientific explanation that determines whether or not Car A was speeding when it collided with Car B.

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