A1000 kg car pushes a 2000 kg car that has a dead battery. when the driver steps on the accelerator, the drive wheels of the car push backward against the ground with a force of 4500 n.

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