If you throw a rock off a cliff, how fast will it be traveling just before it hits the ground? Assume that the rock is thrown horizontally. You throw the rock at 7.2 m/s and the cliff is 15 meters high.

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