What is the best description of a convergent boundary? (do they move towards eachother, side by side past each other, away from each other, or are they attracted to each other by gravity)

In a system with only a single force acting upon a body, what is the relationship between the change in kinetic energy and the work done by the force? answers: work is equal to the change in kinetic energy.work depends on the square of the change in potential energy.work is equal to the negative of the change in kinetic energy.work is equal to the square of the change in kinetic energy