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1 April, 12:28

You and a friend stand still on an escalator. A stationary observer sees you moving at a speed of 0.35 m/s. From your frame of reference, what is the speed of your friend?

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  1. 1 April, 13:51
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    It's 0 m/s because you're both moving on the same machine at the same speed, so it appears that they're not moving
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