A father and daughter are sitting on a see-saw that is 2 meters long. The father has a weight of 600N and the daughter has a weight of 150N. Where does the father have to sit to balance the child who is sitting on the other end?

The boat's velocity relative to the riverbank can be resolved into two components. the component going north is 2.7 m/s and the component going west is 1.2 m/s.we add these two vectors and then find the magnitude of the resultant to get the speed.the magnitude of the resultant vector from adding can be obtained by the pythagorean theorem.    to two significant figures, the boat's speed relative to the riverbank is 3.0 m/s.