A boat whose speed in still water is 170 ms must cross a


A boat, whose speed in still water is 1.70 m/s, must cross a 260-m-wide river and arrive at a point 110m upstream from where it starts (Fig). To do so, the pilot must head the boat at a 45o upstream angle. What is the speed od the river's current?

927_speed od the river current.jpg

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Physics: A boat whose speed in still water is 170 ms must cross a
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