Water is being pumped straight up at a constant rate 2.58m/s from the basement of a building to the top floor. If the mass of the water is 1.98 kg how much power is required to move the water?

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