Asked by Lindsay

At the entrance channel of a harbor, the tidal current has a velocity of 4.94 km/hr in a direction 23.2° south of east. Suppose a ship caught in this current has a speed of 15.6 km/hr relative to the water. If the helmsman keeps the bow of the ship aimed north, what will be the speed of the ship relative to the ground?

I know this is vector addition, but I'm unsure on which steps I need to take first.
Answered by bobpursley
Break the tidal current into components, S and E. Add that to the N movement of the ship.

Then, put the N and E components together to get the answer. I will be happy to critique your thinking.
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