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Angola Air Force Academy Entrance Exam Practice Questions - Concurso De Admissão à Academia Da Força Aérea Nacional (AFAN - FAA) Exam

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An aircraft flies along a straight trajectory given by the vector equation r(t) = (100 + 40t, 200 + 30t), where position is in kilometers and time t is in hours. What is the ground speed of the aircraft?
Correct Answer:
50 km/h

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