Question

Understand by negative value of velocity explain it by its example

Answer 1

An object which moves in the negative direction has a negative velocity. If the object is speeding up then its acceleration vector is directed in the same direction as its motion (in this case, a negative acceleration).

eg, I drive from home to school (defining my positive direction), then my velocity is positive if I go to school, but negative when I go home from school. It is all about direction seen from how I defined my positive axis.

Consider an example where I end up further back than where I started. I must have had negative net velocity to end up going backwards (I end at a negative position). But only because backwards and forwards are clearly defined as the negative and positive directions, respectively, before I start.

So, does negative velocity exist? Well, since it is just a matter of words that describe the event, then yes. Negative velocity just means velocity in the opposite direction than what would be positive.