"An angler has a fish on the end of the line which is reeled in at 20cm/s from a bridge 3m above the water. Assuming that the fish is on the surface of the water, at what speed is the fish moving through the water when the amount of line out is 4m?"
Answer is given as 0.25m/s
I'm not sure how to even start this question. I would have thought the speed was the same as that being reeled in at of 0.2m/s???