Awave that moves back and forth at right angles is called what

Which of the following would not be taken into consideration when describing the quality of a sound

Aspring with a mass of 2 kg has a damping constant 14 kg/s. a force of 3.6 n is required to keep the spring stretched 0.3 m beyond its natural length. the spring is stretched 0.6 m beyond its natural length and then released. find the position of the mass at any time t. (assume that movement to the right is the positive x-direction and the spring is attached to a wall at the left end.)

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body