Can some one explain how to solve this please? What are the equations we need to use?
Hope this calculation helps! Remember to draw the resulting velocity due to the perpendicular velocities of the river and the boat.
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Isn’t the answer “A”? Specifically because it’s asking for the angle with respect to a line that’s perpendicular to the shore (90 degrees to the riverbank). This would make the adjacent side of the velocity vector equal to 4 m/s.