What happens to gravitational potential energy as a roller coaster moves down a hill? Question 2 options: It is converted to elastic potential energy. It increases. It is converted to kinetic energy. It remains constant.

Which statement best describes the superposition principle? a.) if two in-phase waves arrive simultaneously at a point, their amplitudes add up b.) if two out-of-phase waves arrive simultaneously at a point, their amplitudes add up c.) if two in-phase waves arrive at a point one after another, their amplitudes add up d.) if two out-of-phase waves arrive at a point one after another, their amplitudes adds up