At an airport, Anna is stationary, Bert is walking at a speed of 1.0 m/s, Carla is standing while Dodong is walking on a platform that moves with a speed of 2.0 m/s. Anna observes Bert, Carla, and Dodong moving away from her in the same direction. Anna observes Dodong moving away from her at a speed of 3.0 m/s. What is Anna’s velocity relative to the ground or earth?      2.What is Dodong’s velocity with respect to Carla?      3.What is Dodong’s normal walking speed?

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