Hey, I need some suggestions to approach the problem: A lifeguard standing on a tower throws a buoy to a swinner 5m from the tower. The lifeguard, positioned 3 m above the water, pulls in the rope at a speed of 1m/s. How fast is the swinner coming to the shore when he is at 4m from the water edge? thanks
First, draw a diagram. It should be a triangle with 3m on one side (the height of the life guard), 4m on another side (distance the swimmner is from the edge) and with a little geometry the hypotenuse is 5m. These lengths will give you the angles of the triangle. From here, all you need to find is the COSINE of the angle.