Question

What is the difference between the initial velocity and final velocity in throwing a stone upward and dropping the stone from a certain height

Answer 1

The velocity when rock is thrown is the initial velocity and the velocity with which it comes down is final velocity

Answer 2

Difference between the "initial velocity and final velocity":

The difference between the"initial velocity and final velocity" in throwing a stone upward and dropping the stone from a certain height is called as a "change in velocity" which is given by "delta V".  

This concept is often related to the potential and kinetic energy and hence it has been used to solve the various equations on the velocity and movement.