Who ever that can answer this gets 17 points 1. research how cars or planes have been designed to have less mass. 2. how is the balance between strength and mass resolved when designing cars or planes?

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