What I mean by that is velocity has two components: magnitude (numerical value) and direction. On the other hand, speed only has magnitude.
So to change velocity, you have to change at least one of direction or magnitude. 20 m/s south isn’t the same as 20 m/s north. And when we consider speed, magnitude is all that matters. To change it, you only need to focus on the value itself. 20 m/s south is the same as 20 m/s north - when we consider speed.
A common notion is using +/- sign when we describe velocity. But that doesn’t imply when we consider speed.
Answers & Comments
What I mean by that is velocity has two components: magnitude (numerical value) and direction. On the other hand, speed only has magnitude.
So to change velocity, you have to change at least one of direction or magnitude. 20 m/s south isn’t the same as 20 m/s north. And when we consider speed, magnitude is all that matters. To change it, you only need to focus on the value itself. 20 m/s south is the same as 20 m/s north - when we consider speed.
A common notion is using +/- sign when we describe velocity. But that doesn’t imply when we consider speed.
No velocity will never remains constant...
Hope this will help you...... ✌