Acar travels 20 km north. it then turns around and travels 30 km south. what is the car's displacement?

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.

Mechanical energy is when the amount of kinetic and potential energies added together remains the same. conserved created lost

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