Open Question: physics relative velocity in one dimension?

29 July 2010, 11:26 am

A passenger rushing to catch a plane at the airport walks on a moving sidewalk at a speed of 3.0 km/h relative to the sidewalk in the direction that the sidewalk is moving. The sidewalk is 100 m long and moves with a steady velocity of 1.0 km/h. a) How long does it take for the passenger to get from one en of the sidewalk to the other, that is, to cover the 100 m? b) How much time does the passenger save by taking the moving sidewalk instead of just waling beside it? c) Through what distance does the passenger walk relative to the moving sidewalk? d) If the passenger's stride is 80 cm, how many steps are taken in going from oe end of the moving sidewalk to the other. I'm unsure whether the passenger is walking 3.0 m/s relative to the regular sidewalk, or relative to the moving sidewalk. And if it is relative to the regular sidewalk, how would I go about doing a,b,c,d? Now that MidAtlantian2 has established it is relative to the moving sidewalk (thank you!) how would I go about doing part c and d? I'm not quite sure what part c is asking and I don't know exactly how to go about doing d.... Read More »

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