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. A boat crossing a wide river moves with a speed of 15.0 km/h relative to...

. A boat crossing a wide river moves with a speed of 15.0 km/h relative to the water. The water in the river has a steady speed of 6.00 km/h due east relative to the earth.
a) If the boat heads due north, determine the speed of the boat relative to an observer standing on the shore.
b) What is the angle made between the velocity of the boat relative to the observer and the north direction?

c) At what angle against the stream must the boat be headed with respect to the north direction in order for it to proceed north as seen by the observer on the shore?

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