A policeman is sitting at a railroad crossing as a train goes by along a track that forms a 75° angle with the roadway. The radar gun pointing forward in his car indicates that the train is moving away at speed 11 mph. (a) What is the actual speed of the train along the track? (b) Would the radar gun ever read zero when a train is going across the road? Would it ever read a value greater than the actual speed? Explain.

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