Aperson drops a brick from the top of a building. the height of the building is 400 m and the mass of the brick is 2.00 kg. what will be the speed of the brick right before it touches the ground? use g = 10.0 m/s2

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