1.)A sailboat heads west at 10 km/h in a calm sea. If a breeze of 8.0 km/h [S40oW] begins to blow. What is the sailboat’s resultant velocity?

2.) A student is determined to test the law of gravity for himself. He walks off a skyscraper 320 m high with stopwatch in hand, and starts his free fall. Five seconds later, Superman arrives at the scene and dives off the roof to save the student. What must Superman’s initial velocity be in order to catch the student just before the student reaches the ground? (Assume that Superman’s acceleration is that of any freely falling body ( g = 9.81 m/s2)

there are no components of a physical goal mentioned on the list of choices that you've provided.

chemical energy --> gravitational potential energy --> kinetic energy --> elastic potential energy --> gravitational potential energy

explanation:

when emma starts the hike, the chemical energy stored in her body is used to climb up the mountain, and so she gains gravitational potential energy (because at the end, she will be at a higher height h above the ground). then she goes bungee jumping: as she falls, this gravitational potential energy is converted into kinetic energy (because her speed increases as she falls down), until the point when the rope stretches, and she stops moving. at that moment, all the kinetic energy is converted into elastic potential energy due to the stretching of the rope. then, this energy is released because the rope returns to its natural length, and emma gains a small increase in altitude , so she gains some gravitational potential energy.