Question

Wich speed is frist ?​

Answer 1

Explanation:

The Italian physicist Galileo Galilee was among the first to try to measure the speed of light. In the early 17th century, he devised an experiment in which two people with covered lanterns stood a known distance apart.

Your speed is the first derivative of your position. ... If a function gives the position of something as a function of time, the first derivative gives its velocity, and the second derivative gives its acceleration.