A swing with a beautiful sea view is hung from a tree branch that is found to obey Hooke's law so that when a 20-kg load (a person sits on the swing with a mass of 20-kg ) the branch sags 10 cm. a) How much will the branch sag if a 40-kg mass gets on the swing. b). How much will the branch sag if a 60-kg mass gets on the swing?

B. a circuit. i think

The answer is c hope this

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.