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High-Water Crossing

If you’ve ever watched a duck swim furiously upriver without appearing to move or a seagull fly directly into a gale without getting anywhere, you already have an idea about relative velocity. Relative to you, the duck or the gull doesn’t seem to be moving very much at all, but relative to the water or the air, they are moving pretty quickly.

But which viewpoint is the right one? Are they moving or stationary? Does it even matter?

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