Question

A river flows from south to north at 5km/hr. On this river a boat is heading east to west perpendicular to the current at 7km/hr. As viewed by an eagle hovering at rest over the shore, how fast and in what direction is the boat travelling?
Vb = -7 + 5i = 8.6km/h[-35.5o] = 8.6km/h[35.5o] N. of W.



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