The picture shows a car on a race track. Force from friction Force from motor If the car was in motion on the race track, how would the car be affected if the force of friction and the force from the motor were equal? A The car would maintain constant motion.
B The car would turn right.
C The car would increase in speed.
D The car would decrease in speed.

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