A wombat runs south in a straight line with an average velocity of 5m/s for 4 minutes and then with an average velocity of 4m/s for 3 minutes in the same direction. a) What is the wombat's total displacement? b) What is its average velocity during this time?

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