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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?

Respuesta :

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

Just imagine that the whole world spins around your escalator. You see, the world goes 0.35 m/s and your friend stands with you, so his speed is 0.

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