The stiffness of a particular spring is 680 n/m. one end of the spring is attached to a wall. when you pull on the other end of the spring and hold it stretched with a steady force of 133 n, the spring elongates to a total length of 57 cm. what was the relaxed length of the spring? (remember to convert to s. i. units.)

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