What is the rate of change of position in which the same distance is traveled each second ?

The rate of change of position in which the same distance is traveled each second is called uniform velocity.

Explanation:

When there is a change in the position coordinate of an object with respect to time, it is has a velocity associated with it.Similarly, when there is a change in the velocity component of the object with respect to the time, there is an acceleration associated with it.When the rate of change of position in which the same distance is traveled each second, the object is said to be in uniform velocity. Therefore,  there is no acceleration acting on the object.Since there is no acceleration acting on the object, the net force on the object is zero.

The pitch of a sound come from the frequency of the soundwave, soundwaves that have bigger frequencies sound with a high pitch and soundwaves with less frequencie have low pitch.