Since the ship is moving parallel to the shoreline, the distance between the ship and the lighthouse will remain constant. Therefore, the distance s between the lighthouse and the ship is equal to the initial distance of 9 km.
Thus, the function f(d) = 9 km.
A ship is moving at a speed of 15 km/h parallel to a straight shoreline. The ship is 9 km from shore, and it passes a lighthouse at noon.
(a)
Express the distance s (in km) between the lighthouse and the ship as a function of d, the distance the ship has traveled since noon; that is, find f so that
s = f(d).
s = f(d) =
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