Bob and Bill left school and walked at opposite direction. Bob walked at 28 m/min and Bill walked at 31 m/min. How far would they be apart
from each other in meters after 5 minutes?

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