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A moving walkway has a speed of 0.9 m/s to the east. A stationary observer sees a man walking on the walkway with a velocity of 1.1 m/s to the east. What is the man's velocity relative to the moving walkway? A. 0.2 m/s west B. 0.2 m/s east C. 1.1 m/s west D. 0.9 m/s east