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Question: an adventurer paddles a kayak across the current in wild...

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An adventurer paddles a kayak across the current in wild river. She appears to an observer sitting on the riverbank to be travelling directly across the river at 90° to the riverbank, and the water velocity is parallel to the riverbank (in other words, downstream). To do this she must paddle at a constant velocity of 1.8 m/s relative to the water at an angle of 28° from the upstream direction. The river is 76 m wide. What is the speed of the water current?

 

 

 

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