A man rows a boat with a speed of 18 km/hr in the northwest direction. The shoreline makes an angle of 1 5 ∘ south of west. Obtain the component of the velocity of the boat along the shoreline:

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The northwest direction makes 4 5 ∘ with west; the shoreline is 1 5 ∘ south of west, so the angle between the boat velocity and the shoreline is 6 0 ∘ . Component = 18 cos 6 0 ∘ = 9 km/hr. Option A.

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